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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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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
Abstract
To improve the hydrogen-storage properties of Mg
2
Ni, LiBH
4
was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg
2
Ni-10LiBH
4
was prepared with a composition of 90 wt% Mg
2
Ni + 10 wt% LiBH
4
. The quantity of released hydrogen (H
r
) versus temperature T curve for Mg
2
Ni10LiBH
4
was obtained by heating at.....
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진공 브레이징을 통해 제조한 TiAl/HI-TEMP 820/SCM440H 재료의 공정 온도에 따른 미세조직 및 기계적 특성 평가
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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
Abstract
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......
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Er 합금 원소 첨가를 통한 인장 물성과 절삭성이 우수한 Ti 합금 개발
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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
Abstract
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.....
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Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
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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
Abstract
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
o
C, respectively, for 80 min for solutionizing.....
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Ti-xMo-2Fe 베타계 타이타늄 합금의 기계적 특성 및 부식 특성에 미치는 Mo의 영향 평가
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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
Abstract
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.....
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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
Abstract
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.....
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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
Abstract
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.....
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산소함량에 따른 Ti-6Al-4V 적층제조 조형체의 미세조직 및 기계적 특성 변화
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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
Abstract
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.....
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Web of Science 1
Crossref 3
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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
Abstract
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.....
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Web of Science 3
Crossref 4
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6K 초극저온 인장 시험 : Fe-Mn-Cr 강의 미세조직 및 기계적 물성
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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
Abstract
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.....
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초미립 TiB
2
-ZrO
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복합재료 합성 및 고속 소결
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손인진
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
Abstract
TiB
2
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.....
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Cu 및 Zr 첨가 A356 합금의 열처리 조건에 따른 상 변화와 기계적 특성 분석
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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
Abstract
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
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열간압출 공정으로 제조한 Bi
2
Te
2.7
Se
0.3
의 전기전도 특성
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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
Abstract
Herein we report the optimized processing conditions of hot extrusion for fabricating an
n
-type Bi
2
Te
2.7
Se
0.3
thermoelectric compound, with high electronic transport properties as well as improved mechanical reliability. We fabricated a Bi
2
Te
2.7
Se
0.3
extrudate that was 3.8 mm in diameter and 700 mm in length by controlling the processing parameters of.....
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초음파 분무 열분해와 가압소결로 제조한 이트리아 분산입자 강화 텅스텐의 특성
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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
Abstract
The effects of fabrication method on the microstructure and sinterability of W-1 wt% Y
2
O
3
were analyzed. W composite powders dispersed with Y
2
O
3
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
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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
Abstract
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.....
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Bi
2
Te
3
, Sb
2
Te
3
, 및 Bi
0.5
Sb
1.5
Te
3
플레이크들의 광학 및 광전자적 특성
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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
Abstract
In this study, a mechanical exfoliation method was developed for the synthesis of high purity Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes. The synthesized Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi
2
Te
3
, Sb
2
Te
3
, and Bi
0.5
Sb
1.5
Te
3
flakes.....
More
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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
Abstract
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.....
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단일벽 탄소나노튜브와 다중벽 탄소나노튜브 사용에 따른 고분자 복합체의 기계적, 전기적 물성
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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
Abstract
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 4
Crossref 5
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머신러닝을 이용한 화합물 조성기반 초경질 소재 특성 예측
C
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남충희
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
Abstract
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.....
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Web of Science 3
Crossref 2
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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
Abstract
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 4
Crossref 4
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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
Abstract
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
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박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
D
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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
Abstract
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
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A
7
0
7
5
-
T
6
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A7075-T6 합금에서 η' 석출상의 재고용이 기계적 특성에 미치는 영향
Y
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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
Abstract
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
o
C or higher, elongation significantly increased and dissolution of the η′ phase occurred. η′ is the main hardening phase. After.....
More
Web of Science 6
Crossref 7
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>
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나노구조의 ZrB
2
-Al
2
O
3
복합재료 합성과 소결
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손인진
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
Abstract
ZrB
2
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, ZrB
2
applications are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach.....
More
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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
Abstract
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.....
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Web of Science 1
Crossref 1
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나노구조의 ZrB
2
-SiC 복합재료 합성과 소결
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손인진
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
Abstract
ZrB
2
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 ZrB
2
are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the.....
More
Web of Science 1
Crossref 3
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급속소결에 의한 WC-Graphene-Al 복합재료 제조 및 기계적 성질
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손인진
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
Abstract
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.....
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Web of Science 1
Crossref 1
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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
Abstract
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.....
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Web of Science 3
Crossref 4
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고전류밀도에서의 첨가제 초기 거동 및 동박의 기계적 특성
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우태규, 박종재, 박일송
Korean J. Met. Mater.
2021;59(5):304-313. Published online 2021 Apr 6
DOI:
https://doi.org/10.3365/KJMM.2021.59.5.304
Abstract
In this study, we studied the surface and mechanical properties of multiple additives as well as the initial plating properties of individual additives. With the individual additive groups, copper crystals tended to converge at a stage above the critical amount of additive. When chloride ions were added, large crystals formed.....
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Web of Science 2
Crossref 2
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Ca와 Zr을 소량 첨가한 나노결정 Fe-Si-B-Cu계 합금의 미세조직변화와 자기적특성
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안수봉, 장수환, 박원욱, 손근용
Korean J. Met. Mater.
2021;59(3):168-176. Published online 2021 Feb 19
DOI:
https://doi.org/10.3365/KJMM.2021.59.3.168
Abstract
Nanocrystalline Fe-Si-B-Nb-Cu Finemet alloys show low saturation magnetic flux density compared to amorphous Fe-Si-B alloys. In the Fe-Si-B-Cu base amorphous alloys, Cu atoms form clusters which act as heterogeneous nucleation sites for α-Fe crystals. The addition of Ca element atoms, distributed along grain boundaries, helps inhibit grain growth and increase.....
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Web of Science 2
Crossref 2
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