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Research Papers
617 Formation and Characterization of Mg-Cu-Gd-Nd Bulk Metallic Glass Using NdFeB Magnet Scrap
NdFeB 자석 스크랩을 이용한 Mg-Cu-Gd-Nd 비정질 합금의 제조 및 특성
Duck Hwan Yoon, Hong Min, Hong Jun Chae, Jin Kyu Lee
윤덕환, 민홍, 채홍준, 이진규
Korean J. Met. Mater. 2019;57(10):617-623.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.617

Abstract
In the present study, new Mg-based bulk metallic glasses have been developed in a Mg-Cu-GdNd based system using a Mg-Nd byproduct obtained from the recycling process of NdFeB magnet scrap through liquid metal extraction. The Mg-Cu-Gd-Nd bulk metallic glasses with a diameter of 2 mm are fabricated by injection casting..... More

                        
624 Effect of Cr and N on Stress Corrosion Cracking Behavior of Fe-18Mn Steel
Fe-18Mn강의 응력부식균열 거동에 미치는 크롬과 질소의 영향
Heesoo Choi, Sumin Kim, Hyokyung Sung, Sung-Joon Kim, Sangshik Kim
최희수, 김수민, 성효경, 김성준, 김상식
Korean J. Met. Mater. 2019;57(10):624-631.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.624

Abstract
High-Mn steels developed for offshore industries require good resistance to stress corrosion cracking (SCC) in seawater. Elements like Cr and N are often added to improve the resistance to SCC. In this study, the SCC behavior of Fe18Mn3Cr0.1N and Fe19Mn19Cr0.6N steels in artificial seawater was examined. Slow strain rate tests..... More

                        
632 Evolution of Microstructures and Mechanical Properties of 5052 Aluminum Alloys with Variation of Rolling and Annealing Temperatures
압연온도 및 어닐링 온도에 따른 5052합금의 미세조직 및 기계적 성질
Ui Gu Kang, Won Jong Nam
강의구, 남원종
Korean J. Met. Mater. 2019;57(10):632-640.   Published online 2019 Sep 23
DOI: https://doi.org/10.3365/KJMM.2019.57.10.632

Abstract
The microstructural evolution and corresponding mechanical properties of 5052 Al alloys with different deformation temperatures and post-deformation annealing conditions were investigated. The warmrolled alloy showed higher strength and elongation than the cold-rolled and cryo-rolled alloys. The improved strength and ductility of warm rolled alloys is attributed to the formation of..... More

                        
641 Optimization of Electrochemical Variables of Pulse-Reverse Electroplating in Trivalent Chromium Bath to Enhance the Corrosion Resistance of Chromium Film
3가 크롬 도금욕에서 펄스 도금의 전기화학적 변수 최적화를 통한 크롬 도금막의 내식성 향상 연구
Chaewon Lim, Dongwook Lim, Bonil Ku, Sang Eun Shim, Sung-Hyeon Baeck
임채원, 임동욱, 구본일, 심상은, 백성현
Korean J. Met. Mater. 2019;57(10):641-647.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.641

Abstract
Electroplating chromium films in a trivalent chromium bath has been extensively investigated as a replacement for the conventional hexavalent chromium bath. However, commercialization of the trivalent chromium method has been hindered because the resulting chromium films exhibit inferior mechanical properties compared to hexavalent chromium coated film. In this study, we..... More

                        
648 High-Temperature Corrosion of Ti-44Al-6Nb-2Cr-0.3Si-0.1C Alloy in 0.2%SO2/Ar Gas
Ti-44Al-6Nb-2Cr-0.3Si-0.1C 합금의 0.2%SO2/Ar가스에서의 고온부식
Shi Yuke, Xiao Xiao, Seong Woong Kim, Jae Keun Hong, Junhee Hahn, Dong Bok Lee
Shi Yuke, Xiao Xiao, 김성웅, 홍재근, 한준희, 이동복
Korean J. Met. Mater. 2019;57(10):648-655.   Published online 2019 Sep 23
DOI: https://doi.org/10.3365/KJMM.2019.57.10.648

Abstract
Cast Ti–44Al–6Nb–2Cr–0.3Si–0.1C alloy having good air-oxidation resistance was corroded under 1 atm of flowing 0.2%SO2/Ar gas at 900-1100 oC for 50-300 h in order to examine its corrosion behavior in a SO2-containing environment, because SO2 is an industrially important by-product in the field of combustion and processing of fossil fuels...... More

                        
656 A Study on the Separation and Concentration of Li from Li-Containing Waste Solutions by Electrodialysis
리튬함유 폐액으로부터 전기투석에 의한 리튬의 분리·농축 연구
Jueun Lee, Hongil So, Yeonchul Cho, Inhwan Jang, Jaewoo Ahn, Jaeheon Lee
이주은, 소홍일, 조연철, 장인환, 안재우, 이재헌
Korean J. Met. Mater. 2019;57(10):656-662.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.656

Abstract
Electrodialysis was used to develop a highly efficient process for concentrating and recovering Li from the Li-containing waste solution that is generated after recovering Co and Ni from a leach solution of waste cathode materials of Li ion batteries. The optimum conditions were investigated by comparing the concentration of Li..... More

                        
663 Improvement of the Hydrogen-Release Features of Mg-Graphene Composite by Adding Nickel via Reactive Ball Milling
Eunho Choi, Young Jun Kwak, Myoung Youp Song
Korean J. Met. Mater. 2019;57(10):663-672.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.663

Abstract
The dehydrogenation rates of graphene-added Mg (named Mg-5graphene) were very low at 573 K and 593 K. Ni was added to increase the dehydrogenation rates of graphene-added Mg. Samples (designated as Mg-2.5Ni-2.5graphene) with a composition of 95 wt% Mg + 2.5 wt% Ni + 2.5 wt% graphene were prepared by..... More

                        
673 Effect of Cu/In Doping on the Thermoelectric Transport Properties of Bi-Sb-Te Alloys
Bi-Sb-Te계 합금의 열전물성에 대한 Cu 및 In 첨가 영향
Hyun Jun Cho, Hyun-Sik Kim, Sang-Il Kim
조현준, 김현식, 김상일
Korean J. Met. Mater. 2019;57(10):673-678.   Published online 2019 Sep 23
DOI: https://doi.org/10.3365/KJMM.2019.57.10.673

Abstract
Herein we report the effect of Cu/In doping on the electronic and thermal transport properties of Bi-Sb-Te thermoelectric alloys. To closely examine the role of each doping element when incorporated in a Bi0.4Sb1.6Te3 alloy, different groups of samples were prepared and characterized, including undoped Bi0.4Sb1.6Te3, In single-doped samples and In..... More

                        
679 Fabrication of Open-Pored Titanium Foam for Biomedical Implants
생체의료 임플란트용 개기공 티타늄 다공체 제조
Gyeong-Uk Kim, Jin Man Jang, Yong-Dae Kim, Jae-Chul Lee, Wonsik Lee
김경욱, 장진만, 김용대, 이재철, 이원식
Korean J. Met. Mater. 2019;57(10):679-687.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.679

Abstract
Open-pored metal foams have been partly used for orthopedic or dental applications because of their good bone ingrowth behavior and low elastic modulus. In this paper, we report a method that can produce open-pored Ti foams using a technique that combines the powder injection molding process and feedstocks containing expandable..... More

                        
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