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Sintering Behavior and Thermal Properties of Cu-Graphite Materials by a Spark Plasma Sintering Method
방전플라즈마소결법을 이용한 구리-흑연 재료의 소결거동 및 열적 특성 평가
Min-hyeok Yang, Bum-soon Park, Hyoung-seok Moon, Jae-cheol Park, Hyun-kuk Park
양민혁, 박범순, 문형석, 박재철, 박현국
Korean J. Met. Mater. 2024;62(6):411-418.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.411

The use of heat dissipation materials in various field such as power semiconductor device, LED and microelectronic system. Therefore, there is a need for heat dissipation materials using copper (Cu) and graphite (Gr). These materials have high thermal conductivity. In particular, graphite has high thermal stability with a low coefficient..... More

Microstructure, Thermal and Mechanical Properties of AlN-MgO Composites Prepared by Spark Plasma Sintering
방전 플라즈마 소결법으로 제조된, AlN-MgO 소결체의 미세구조와 열적, 기계적 특성
Mohan Chen, Myungjin Jung, Jung-Won An, Seung Yong Shin, Yunhwi Park, Sunrae Kim, Su Yong Nam, Woo-Jae Lee, Se-Hun Kwon
모한첸, 정명진, 안정원, 신승용, 박윤휘, 김선래, 남수용, 이우재, 권세훈
Korean J. Met. Mater. 2024;62(5):367-376.   Published online 2024 May 5
DOI: https://doi.org/10.3365/KJMM.2024.62.5.367

AlN-MgO composites with different compositions were prepared by spark plasma sintering, and the effects of their composition on their microstructure, thermal properties, and mechanical properties were systemically investigated. MgO compositions in the AlN-MgO composites were controlled from 20 to 80 wt%. The results indicated that a phase transition did not..... More

Improvement in the Hydrogen-Storage Properties of Mg<sub>2</sub>Ni by Adding LiBH<sub>4</sub>
Young Jun Kwak, Myoung Youp Song, Ki-Tae Lee
Korean J. Met. Mater. 2024;62(4):299-305.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.299

To improve the hydrogen-storage properties of Mg2Ni, LiBH4 was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg2Ni-10LiBH4 was prepared with a composition of 90 wt% Mg2Ni + 10 wt% LiBH4. The quantity of released hydrogen (Hr) versus temperature T curve for Mg2Ni10LiBH4 was obtained by heating at..... More

Evaluation of Microstructure and Mechanical Properties of TiAl/HI-TEMP 820/ SCM440H Materials Manufactured through Vacuum Brazing according to Process Temperature
진공 브레이징을 통해 제조한 TiAl/HI-TEMP 820/SCM440H 재료의 공정 온도에 따른 미세조직 및 기계적 특성 평가
Sang-Kyu Yoo, Ji-Won Kim, Cho-Long Lee, Myung-Hoon Oh, In-Chul Choi
유상규, 김지원, 이초롱, 오명훈, 최인철
Korean J. Met. Mater. 2024;62(3):229-238.   Published online 2024 Feb 28
DOI: https://doi.org/10.3365/KJMM.2024.62.3.229

The TiAl alloy is attracting attention as a lightweight and heat-resistant material, because of its high specific strength, excellent high-temperature formability, and fatigue strength. However, its applications are limited by its high unit price and low room temperature ductility. To overcome this issue, dissimilarly bonded materials have been extensively employed...... More

Development of Highly Machinable Ti Alloy with Exceptional Tensile Properties by Er Alloying Element Addition
Er 합금 원소 첨가를 통한 인장 물성과 절삭성이 우수한 Ti 합금 개발
Yi Seul Choi, Jeong Mok Oh, Chan Hee Park, Wook Jin Lee, Yong ho Park, Jong Woo Won
최이슬, 오정목, 박찬희, 이욱진, 박용호, 원종우
Korean J. Met. Mater. 2024;62(3):171-179.   Published online 2024 Mar 5
DOI: https://doi.org/10.3365/KJMM.2024.62.3.171

This study demonstrates that the addition of the rare earth element Erbium (Er) significantly enhances the machinability and tensile properties of titanium (Ti). Pure Ti alloys and Er-added Ti alloys with 0.5-1.1 wt.% Er content were prepared, and their microstructure, machinability, and tensile properties were compared. Two different types of..... More

Effect of Solution Temperature and Quench Delay on the Microstructure and Mechanical Properties of an Extruded Al-Mg-Si-Cu-Mn alloy
Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
Jisu Kim, Jeki Jung, Hyun-Seok Cheon, Byung-joo Kim, Cha-Yong Lim, Su-Hyeon Kim, Yoon Suk Choi
김지수, 정제기, 천현석, 김병주, 임차용, 김수현, 최윤석
Korean J. Met. Mater. 2024;62(2):132-141.   Published online 2024 Jan 30
DOI: https://doi.org/10.3365/KJMM.2024.62.2.132

The effect of solution temperature and quench delay on the microstructure and mechanical properties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanning calorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens were held at 500 and 540 oC, respectively, for 80 min for solutionizing..... More

Effect of Molybdenum on the Mechanical and Corrosion Properties of Ti-xMo-2Fe Beta Alloys
Ti-xMo-2Fe 베타계 타이타늄 합금의 기계적 특성 및 부식 특성에 미치는 Mo의 영향 평가
Jeong-Yeon Park, Jae-Gwan Lee, Yong-Jae Lee, Dong-Geun Lee
박정연, 이재관, 이용재, 이동근
Korean J. Met. Mater. 2024;62(2):125-131.   Published online 2024 Jan 30
DOI: https://doi.org/10.3365/KJMM.2024.62.2.125

Titanium alloys are currently used in offshore industries. The titanium alloys used in offshore plants need to have excellent corrosion resistance and mechanical properties because offshore plants are exposed to harsh corrosive environments. At this time, the Ti-6Al-4V ELI alloy is mainly used in offshore plants because it has excellent..... More

Changes in Microstructure, Mechanical and Electrical Properties with Progress of Cold Wire-Drawing for AA1070
Sang-Hyeon Jo, Seong-Hee Lee
Korean J. Met. Mater. 2023;61(11):867-873.   Published online 2023 Oct 29
DOI: https://doi.org/10.3365/KJMM.2023.61.11.867

Commercial AA1070 alloy for electrical wire is severely deformed by the drawing process when a rod with a diameter of 2 mm is greatly reduced to 0.4 mm by multi-pass. Changes in the microstructure, mechanical properties, and electrical properties of the Al alloy during the wire-drawing process were investigated in..... More

A Study on the Microstructure, Tensile and Fatigue Properties of Martensitic Stainless Steel Plate
Hyojoo Lee, Sam Yaw Anaman, Nam-Su Rho, Si-Hyun Sung, Hyun-Min Sung, Sang-Yeob Lee, Hoon-Hwe Cho
Korean J. Met. Mater. 2023;61(11):815-823.   Published online 2023 Oct 29
DOI: https://doi.org/10.3365/KJMM.2023.61.11.815

The microstructure, tensile and fatigue properties of a martensitic stainless steel (MSS) plate with a thickness of 0.152 mm are investigated in this study. The microstructural properties were initially studied using electron backscatter diffraction microscopy. High dislocation densities were observed in the microstructure, along with the rolling texture revealed by..... More

Effect of Oxygen Content on Microstructure and Mechanical Properties of Additive Manufactured Ti-6Al-4V
산소함량에 따른 Ti-6Al-4V 적층제조 조형체의 미세조직 및 기계적 특성 변화
Tae Jin Kang, P. L Narayana, Seong Woo Choi, Jae Hyuk Kim, Jae-Keun Hong, Taekyung Lee
강태진, P.L. Narayana, 최성우, 김재혁, 홍재근, 이태경
Korean J. Met. Mater. 2023;61(9):714-720.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.714

Titanium alloys are used in many fields including military, aerospace, and biomedical because of their excellent specific strength, corrosion resistance, and biocompatibility. Recently, much research has been focused on addressing the disadvantages of conventional manufacturing methods, including reducing material and energy waste when manufacturing titanium alloy parts by additive manufacturing..... More

                   Web of Science 4  Crossref 5
Effects of Stacking Number on Microstructure and Mechanical Properties for Cold Roll Bonding Process of Dissimilar Aluminum Alloy Sheets
Seong-Hee Lee
Korean J. Met. Mater. 2023;61(9):652-658.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.652

A cold roll-bonding (CRB) process is applied to study the effects of stacking number on the microstructure and mechanical properties of roll-bonded and age-treated Al sheets. Commercial AA1050 and AA6061 sheets with a thickness of 2 mm were stacked alternately on each other to two and four layers, and roll-bonded..... More

                   Web of Science 4  Crossref 4
Tensile testing at the Extremely Low Temperature of 6K : Microstructure and Mechanical Properties of a Fe-Mn-Cr Steel
6K 초극저온 인장 시험 : Fe-Mn-Cr 강의 미세조직 및 기계적 물성
Young-Kyun Kim, Ka-Ram Lim, Young-Sang Na
김영균, 임가람, 나영상
Korean J. Met. Mater. 2023;61(6):389-396.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.389

Materials with superior cryogenic strength and good ductility are increasingly in demand for resident friendly liquid-hydrogen (20K) storage tanks. Additionally, the space industry also requires materials that retain excellent mechanical properties at extremely low temperatures. However, mechanical testing at such low temperatures is highly limited due to the difficulties in..... More

                   Crossref 2
Synthesis and Rapid Sintering of Ultra Fine TiB<sub>2</sub>-ZrO<sub>2</sub> Composite
초미립 TiB2-ZrO2 복합재료 합성 및 고속 소결
In-Jin Shon
Korean J. Met. Mater. 2023;61(5):324-329.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.324

TiB2 is considered candidate materials for ultra-high temperature ceramics and cutting tools because of its a high thermal conductivity, a low coefficient of thermal expansion, a high hardness and high melting temperature. Despite these attractive properties, TiB2 applications are limited because it has a low fracture toughness below the brittle-ductile..... More

Investigation of Phase Transformation and Mechanical Properties of A356 Alloy with Cu and Zr Addition during Heat Treatment
Cu 및 Zr 첨가 A356 합금의 열처리 조건에 따른 상 변화와 기계적 특성 분석
Tae-Ung Song, Ja-Uk Koo, Seung-Byeong Jeon, Chang-Yeol Jeong
송태웅, 구자욱, 전승병, 정창열
Korean J. Met. Mater. 2023;61(5):311-323.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.311

Cast A356(Al-Si-Mg) alloys are widely used in automotive and general applications because of their mechanical properties and castability. Al-Si-Mg-(Cu) alloys typically lose their strength above 170 o C due to coarsening of precipitates, which limits their application to components. To maintain their strength at elevated temperature, Al-Si-Mg-(Cu) alloys are modified..... More

                   Web of Science 1  Crossref 1
Electronic Transport Properties of Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> Fabricated by Hot Extrusion
열간압출 공정으로 제조한 Bi2Te2.7Se0.3의 전기전도 특성
Jeong Yun Hwang, Rahidul Hasan, Kyu Hyoung Lee
황정윤, Rahidul Hasan, 이규형
Korean J. Met. Mater. 2023;61(3):213-217.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.213

Herein we report the optimized processing conditions of hot extrusion for fabricating an n-type Bi2Te2.7Se0.3 thermoelectric compound, with high electronic transport properties as well as improved mechanical reliability. We fabricated a Bi2Te2.7Se0.3 extrudate that was 3.8 mm in diameter and 700 mm in length by controlling the processing parameters of..... More

Properties of Y<sub>2</sub>O<sub>3</sub> Dispersion Strengthened W Fabricated by Ultrasonic Spray Pyrolysis and Pressure Sintering
초음파 분무 열분해와 가압소결로 제조한 이트리아 분산입자 강화 텅스텐의 특성
Eui Seon Lee, Youn Ji Heo, Ji Young Kim, Young-In Lee, Myung-Jin Suk, Sung-Tag Oh
이의선, 허연지, 김지영, 이영인, 석명진, 오승탁
Korean J. Met. Mater. 2023;61(3):170-174.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.170

The effects of fabrication method on the microstructure and sinterability of W-1 wt% Y2O3 were analyzed. W composite powders dispersed with Y2O3 particles were synthesized by the ultrasonic spray pyrolysis process or the ultrasonic spray pyrolysis/polymer solution process. A dense composite was fabricated by a combination of spark plasma sintering..... More

                   Web of Science 1  Crossref 1
Thermal and Mechanical Properties of Cu-Graphite Composites with Spatial Anisotropy
Geon Hong Ryu, Changil Son, Jeffrey C. Suhling, Jiseok Lee, Sangha Park, Myunghwan Byun
Korean J. Met. Mater. 2023;61(2):120-125.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.120

In the present study, we analyzed the thermal and mechanical properties of Cu-graphite composites (CGCs) with spatially anisotropic graphite layers. These composites were fabricated using a combination of electroless plating and spark plasma sintering (SPS) processes. Thermal conductivities and thermal expansion coefficients of the composites were measured using differential thermal..... More

                   Web of Science 1  Crossref 1
Optical and Optoelectronic Properties of Bi<sub>2</sub>Te<sub>3</sub>, Sb<sub>2</sub>Te<sub>3</sub>, and Bi<sub>0.5</sub>Sb<sub>1.5</sub>Te<sub>3</sub> Flakes
Bi2Te3, Sb2Te3, 및 Bi0.5Sb1.5Te3 플레이크들의 광학 및 광전자적 특성
Hyeun Seung Jo, Ju Won Kim, Sang-iL Kim, TaeWan Kim
조현승, 김주원, 김상일, 김태완
Korean J. Met. Mater. 2023;61(2):107-114.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.107

In this study, a mechanical exfoliation method was developed for the synthesis of high purity Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes. The synthesized Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes..... More

Effects of V Alloying on Thermoelectric Properties of NbFeSb Half-Heusler Materials Codoped with Ti, Zr, and Sn
Sung-Jae Joo, JeongIn Jang, Ji-Hee Son, Bong-Seo Kim, Bok-Ki Min
Korean J. Met. Mater. 2022;60(11):858-864.   Published online 2022 Oct 31
DOI: https://doi.org/10.3365/KJMM.2022.60.11.858

NbFeSb-based alloys are promising p-type half-Heusler materials with excellent thermoelectric performance, thermal stability, and naturally abundant constituent elements. Alloying and doping are powerful techniques for enhancing the thermoelectric properties of half-Heusler materials. This study experimentally investigated the effects of V alloying in NbFeSb codoped with Ti, Zr, and Sn. As..... More

Electrical and Mechanical Properties of Polymer Composite through the Use of Single-Walled Carbon Nanotube and Multi-Walled Carbon Nanotube
단일벽 탄소나노튜브와 다중벽 탄소나노튜브 사용에 따른 고분자 복합체의 기계적, 전기적 물성
Byung-Ho Kang, Oh-Nyoung Hur, Soon-Kook Hong, Sung-Hoon Park
강병호, 허오녕, 홍순국, 박성훈
Korean J. Met. Mater. 2022;60(9):694-700.   Published online 2022 Aug 30
DOI: https://doi.org/10.3365/KJMM.2022.60.9.694

To manufacture composites with required properties, it is extremely important to select an appropriate filler. Carbon-based nano materials such as carbon black, graphene and carbon nanotube (CNT) have been extensively investigated as reinforcing and conducting fillers. Because of their high aspect ratio coupled with superior physical properties, 1-dimensional CNTs are..... More

                   Web of Science 5  Crossref 7
Machine Learning Guided Prediction of Superhard Materials Based on Compositional Features
머신러닝을 이용한 화합물 조성기반 초경질 소재 특성 예측
Chunghee Nam
Korean J. Met. Mater. 2022;60(8):619-627.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.619

In this study, the mechanical properties of materials were predicted using machine learning to search for superhard materials. Based on an AFOW database consisting of DFT quantum calculation values, the mechanical properties of materials were predicted using various machine learning models. For supervised learning, the entire data was divided into..... More

                   Web of Science 4  Crossref 4
Effect of Sn addition on the Microstructure and Frictionwear Properties of a Nodular Graphite Cast Iron
Won-Sang Shin, Seungwoo Baek, Yoon-Jun Kim
Korean J. Met. Mater. 2022;60(6):471-477.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.471

Nodular graphite cast iron is used in the railway and automobile industries because of its excellent workability, abrasion resistance, mechanical strength, and hardenability. To use nodular graphite cast iron in harsh environments, it is essential to examine their friction–wear properties in conjunction with the surface hardness of the materials. Therefore,..... More

                   Web of Science 5  Crossref 5
Process Optimization for Dual Laser Beam Joining for Dissimilar Plastics
Suwon Kim, PilGong Choi, Soo Jin Choi, Sang Bae Han, Jiyeon Choi, Jeng O Kim, Hyonkee Sohn, Sanghoon Ahn, Jiwhan Noh, Heeshin Kang, Kwangyun Jung, Dohyun Kim, Hyun-Deok Kim, Changkyoo Park
Korean J. Met. Mater. 2022;60(6):432-439.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.432

A dual laser beam joining process is introduced for joining dissimilar plastics. A customized laser head was built, and two different diode lasers with central wavelengths of 980 and 1940 nm were simultaneously applied to obtain PMMA/PC-1 and PC-2/ABS joints. Various experimental conditions were employed for the dual laser beam..... More

Effect of Cu on the Microstructure of Al-8Zn-2.5Mg-xCu Alloys Fabricated by Twin roll casting
박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
Dong-Guk Kim, Yong hee Jo, Yun-Soo Lee, Yong-You Kim, Hyoung-Wook Kim, Jung-Ki Kim
김동국, 조용희, 이윤수, 김용유, 김형욱, 김정기
Korean J. Met. Mater. 2022;60(4):329-339.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.329

The effect of Cu content on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-xCu (x: 0, 1, 2, 3) aluminum alloys manufactured by the twin-roll casting process was investigated. The Al-8.0Zn-2.5Mg-xCu alloy showed an increase in surface defects with increasing Cu content. This is because the amount of residual liquid in..... More

                   Web of Science 1  Crossref 1
Effect of Dissolution of Precipitates on Mechanical Properties of A7075-T6 Alloy
A7075-T6 합금에서 η' 석출상의 재고용이 기계적 특성에 미치는 영향
Young-We Kim, Yong-Hee Jo, Yun-Soo Lee, Hyoung-Wook Kim, Je-In Lee
김영위, 조용희, 이윤수, 김형욱, 이제인
Korean J. Met. Mater. 2022;60(1):83-93.   Published online 2021 Dec 14
DOI: https://doi.org/10.3365/KJMM.2022.60.1.83

The effects of dissolution of the η′ phase by solution treatment on the mechanical properties of A7075-T6 alloy were investigated. Immediately after solution treatment of the T6 sheet at 450 oC or higher, elongation significantly increased and dissolution of the η′ phase occurred. η′ is the main hardening phase. After..... More

                Supplementary       Web of Science 9  Crossref 9
Synthesis and Sintering of Nanostructured ZrB<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> Composite
나노구조의 ZrB2-Al2O3 복합재료 합성과 소결
In-Jin Shon
Korean J. Met. Mater. 2021;59(10):692-697.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.692

ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, ZrB2 applications are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach..... More

Effect of Low Transformation Temperature Welding Consumable on Microstructure, Mechanical Properties and Residual Stress in Welded Joint of A516 Carbon Steel
Sungki Choi, Junsang Lee, Jae-Yik Lee, Seung-Kyun Kang, Young-Cheon Kim, Seung-Joon Lee, Dongil Kwon
Korean J. Met. Mater. 2021;59(8):524-532.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.524

The microstructure, mechanical properties and residual stress of flux-cored arc welded ASTM A516-70N carbon steel using a Mn-based low-temperature transformation (LTT) welding consumable were investigated. Microstructural analysis with X-ray diffraction, an electron backscattered diffractometer and a field-emission scanning electron microscope showed that the LTT weld metal was made up of..... More

                   Web of Science 1  Crossref 1
Synthesis and Sintering of Nanostructured ZrB<sub>2</sub>-SiC Composite
나노구조의 ZrB2-SiC 복합재료 합성과 소결
In-Jin Shon
Korean J. Met. Mater. 2021;59(7):439-444.   Published online 2021 Jun 11
DOI: https://doi.org/10.3365/KJMM.2021.59.7.439

ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, applications of ZrB2 are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the..... More

                   Web of Science 2  Crossref 3
Fabrication of WC-Graphene-Al Composites by Rapid Sintering and Their Mechanical Properties
급속소결에 의한 WC-Graphene-Al 복합재료 제조 및 기계적 성질
In-Jin Shon
Korean J. Met. Mater. 2021;59(6):384-391.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.384

Tungsten carbides are very attractive because of their superior properties, e.g., high thermal and electrical conductivities, high melting point, high hardness, and relatively high chemical stability. Tungsten carbides with a binder metal, for example Ni or Co, are mainly used to fabricate nozzles, molds and cutting tools in the composite..... More

                   Web of Science 1  Crossref 1
Correlation between the Microstructure and Mechanical Properties of W-Bearing Ti-6Al-4V Alloys
Godwin Kwame Ahiale, In-Seok Kye, Young Sam Kwon, Yong-Jun Oh
Korean J. Met. Mater. 2021;59(6):357-364.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.357

W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated..... More

                   Web of Science 3  Crossref 4
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