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Table of Contents | January, 2022  Vol. 60   No.1 Previous Issue | Next Issue | Archive
In this issue:


Review Papers
1 Recent Research Trends for Improving the Stability of Organo/Inorgano Halide Perovskites
유무기 하이브리드 할라이드 페로브스카이트의 안정성 향상을 위한 연구 동향 리뷰
Myeong Jin Seol, Jeong Woo Han, Seung Hwan Hwang, Soo Young Kim
설명진, 한정우, 황승환, 김수영
Korean J. Met. Mater. 2022;60(1):1-13.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.1

Abstract
Because of their superior optical, and electrical properties, lead halide perovskites have emerged as potential materials for light-emitting-diodes. However, some obstacles have yet to be overcome for practical applications including low exciton binding energy, the difficulty of fabricating uniform perovskite films,, and their instability to heat, light, and moisture. In..... More

                           Cited By 3
Research Papers
14 Improvement of Mechanical Properties of Hard Metals Using Solid Solution Strengthened Metallic Binder (Co1-xWx)
고용 강화 금속 바인더(Co1-xWx) 적용을 통한 초경합금의 기계적 특성 향상
Hanjung Kwon
권한중
Korean J. Met. Mater. 2022;60(1):14-25.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.14

Abstract
The metallic binder in WC-Co hard metals was effectively strengthened using the solid solution phases of Co and W. These metallic phases of Co and W (Co1-xWx, x<1), which consist of two kinds of structures (FCC and HCP), were successfully formed by hydrogen reduction of milled oxides mixtures (Co3O4 and..... More

                        
26 Effects of Si and Sn Contents and Heat-Treatment Temperature on the Corrosion Behavior of AISI 439 Ferrite Stainless Steel
Chan Yang Kim, Do hyung Kim, Won sub Chung
Korean J. Met. Mater. 2022;60(1):26-34.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.26

Abstract
This study was conducted to evaluate the corrosion resistance and optimize the heat-treatment process of AISI 439 ferrite stainless steel silicon and tin alloys with reduced chromium. The microstructure of the specimens and deposition under each condition were analyzed. The production of oxide films was compared based on the thickness..... More

                        
35 Effect of Minor Alloying Elements (C, Ni, Cr, Mo) on the Long-Term Corrosion Behaviors of Ultrahigh-Strength Automotive Steel Sheet in Neutral Aqueous Environment
자동차용 초고강도급 강재 내 미량 첨가된 합금원소 (C, Ni, Cr 및 Mo)가 중성 수용액 환경 내 장기 부식거동에 미치는 영향
Hye Rin Bang, Jin-seong Park, Hwan Goo Seong, Sung Jin Kim
방혜린, 박진성, 성환구, 김성진
Korean J. Met. Mater. 2022;60(1):35-45.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.35

Abstract
This study examined the effects of minor alloying elements (C, Ni, Cr, and Mo) on the long-term corrosion behaviors of ultrahigh-strength automotive steel sheets with a tensile strength of more than 1800 MPa. A range of experimental and analytical results showed that the addition of Ni, Cr, and Mo decreased..... More

                        
46 Improving the Corrosion Resistance of AISI 316L Steel for Semiconductor Piping by Controlled Delta-Ferrite Content
Young Woo Seo, Chan Yang Kim, Bo Kyung Seo, Won Sub Chung
Korean J. Met. Mater. 2022;60(1):46-52.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.46

Abstract
This study evaluated changes in delta-ferrite content depending on the preheating of AISI 316L stainless steel. We also determined the reasons for the variation in delta-ferrite content, which affects corrosion resistance. Changes in delta-ferrite content after preheating was confirmed using a Feritscope, and the microstructure was analyzed using optical microscopy..... More

                        
53 Sintering Behavior and Hardness of Tungsten Prepared by Hard Metal Sludge Recycling Process without Ammonium Paratungstate
텅스텐산암모늄 단계 생략 초경합금 슬러지 재활용 공정에 의해 제조된 텅스텐의 소결 및 경도 특성
Hanjung Kwon, Jung-Min Shin
권한중, 신정민
Korean J. Met. Mater. 2022;60(1):53-61.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.53

Abstract
In this paper, we suggest a novel recycling process for hard metal sludge that does not use ammonium paratungstate. Ammonia, which in the conventional recycling process is essential for removing sodium and crystallized tungstate, was not used in the novel process. Instead of ammonia, acid was used to remove the..... More

                        
62 Effects of Composition on the Electromagnetic Wave Shielding/Absorption and Corrosion in Zn-Ni Alloy Thin Film
조성에 따른 Zn-Ni 합금 박막의 전자파 차폐/흡수 특성 및 부식특성 연구
Jeongwook Lim, Yonghwan Kim, Yeonjoo Kim, Pungkeun Song, Ahram Kwon
임정욱, 김용환, 김연주, 송풍근, 권아람
Korean J. Met. Mater. 2022;60(1):62-67.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.62

Abstract
In the Fourth industrial age, there is increasing use of electronic devices with high frequency (GHz) operating circuits for radio wave transmission/reception. This can lead to electromagnetic noise, and malfunctions in nearby devices. Electromagnetic shielding technology has emerged as an important way of preventing device malfunctions due to noise, and..... More

                        
68 Thermal Properties of Copper Matrix-Ceramic Filler Composite Prepared by Polymer Solution Method
Bok-Hyun Oh, Chung-Il Ma, Ji-Yeon Kwak, Heon Kong, Sang-Jin Lee
Korean J. Met. Mater. 2022;60(1):68-75.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.68

Abstract
A copper (Cu) metal-ceramic filler composite with high thermal conductivity and a suitable thermal expansion coefficient was designed for application as a high-performance heat dissipation material. The purpose of the designed material was to utilize the high thermal conductivity of Cu while lowering its high coefficient of thermal expansion by..... More

                        
76 A Case Study of Material Selection Method Based on Engineering and Material Perception Applied to the Smartphone Rear Panel
스마트폰 후면에 적용된 엔지니어링 기반 및 재료지각 기반 재료선택방법의 사례연구
Jaeho Choi
최재호
Korean J. Met. Mater. 2022;60(1):76-82.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.76

Abstract
Smartphones were launched in the market as a product in the early 2000’s. Today, less than 20 years later, the smartphone has become one of the most frequently used devices for human contact. The market is saturated, and competition between products has intensified, and it is not difficult to find..... More

                        
83 Effect of Dissolution of η′ 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

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 oC or higher, elongation significantly increased and dissolution of the η′ phase occurred. η′ is the main hardening phase. After..... More

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