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Table of Contents | October, 2017  Vol. 55   No.10 Previous Issue | Next Issue | Archive
In this issue:


Review Paper
671 Fabrication of the High-Entropy Alloys and Recent Research Trends: A Review
고엔트로피 합금의 제조 방법과 연구 동향: 리뷰
Dami Yim, Hyoung Seop Kim
임다미, 김형섭
Korean J. Met. Mater. 2017;55(10):671-683.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.671

Abstract
Abstract: High-entropy alloys (HEAs), which are defined as a single phase crystalline solid solution with the composition of each constituent element in the range of 5-35 at%, have been the subject of intensive study in the last decade. Most of the HEA research is focused on alloy design, microstructural characterization,..... More

      
Research Papers
684 Age Hardening and Re-crystallization Softening of a CoCrFeMnNi High Entropy Alloy
고엔트로피 합금강의 시효경화 및 재결정 연화현상
Byung Hak Choe, Hyeon Su Jang, Hyoung Seop Kim, Jong Un Moon
최병학, 장현수, 김형섭, 문종언
Korean J. Met. Mater. 2017;55(10):684-688.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.684

Abstract
Age hardening and re-crystallization softening of a type of high entropy alloy, CoCrFeMnNi, was performed to investigate the relationship between microstructure and the property of mechanical hardness. Equiatomic CoCrFeMnNi was produced by casting followed by homogenizing, cold rolling and post heat treatments. TEM analysis revealed that the microstructure of the..... More

      
689 An Investigation of the Effect of Gray Iron Brake Disc Microstructure on Brake Judder
회주철 브레이크 디스크의 미세조직이 브레이크 떨림에 미치는 영향 연구
Min-Gyun Chung, Jae-Young Lee, Jin-Yong Choi, Yoon-Cheol Kim, Seong Jin Kim
정민균, 이재영, 최진용, 김윤철, 김성진
Korean J. Met. Mater. 2017;55(10):689-694.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.689

Abstract
Brake judder is a kind of low-frequency brake vibration and noise phenomenon generated during braking. Various types of judder have been reported, depending on the particular generation mechanism. However, the correlation between the microstructure of gray iron brake discs and judder has seldom been discussed in the literature. In this..... More

      
695 Hydrogen Embrittlement of Three High-Manganese Steels Tested by Different Hydrogen Charging Methods
수소 주입 방식에 따른 세 고망간강의 수소 취화 거동 비교
Seung-Yong Lee, Byoungchul Hwang
이승용, 황병철
Korean J. Met. Mater. 2017;55(10):695-702.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.695

Abstract
In this study the hydrogen embrittlement characteristics of three high-manganese steels were tested using different hydrogen charging methods, and the results were compared with various Mn-containing steels. The results showed that the hydrogen embrittlement susceptibility of the high-manganese steels increased with increasing inherent strength because deformation mechanisms, such as deformation..... More

      
703 Characteristics of Al Alloy Powders Prepared by Gas Atomized Method Using Pulsed Current Sintered-Body Process
가스분무법으로 제조된 Al 합금분말의 펄스통전 소결체의 특성평가
Hyun-Kuk Park, Jun-Ho Jang, Jung-Han Lee, Ik-Hyun Oh
박현국, 장준호, 이정한, 오익현
Korean J. Met. Mater. 2017;55(10):703-709.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.703

Abstract
In this study, Al alloy targets were fabricated using the powder metallurgy (pulsed current activated sintering, PCAS) process for metal PVD coating target applications. Powders were prepared from Al, Si and Cu ingots for sintering Al alloy compacts using the gas atomizing process. To fabricate the gas atomized Al alloy..... More

      
710 Inhomogeneous Deformation of Interstitial Free Steel during the High Pressure Torsion Process
Yuepeng Song, Miaomiao Chen, Wenke Wang, Baoyan Xu, Dongsheng Gao, Shuai Zhang, Hyoung Seop Kim
Korean J. Met. Mater. 2017;55(10):710-715.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.710

Abstract
Interstitial free (IF) steel disks were subjected to various degrees of revolution during application of the high-pressure torsion (HPT) process, and the resulting distributions of hardness and microstructure during the early torsion stage of high-pressure torsion (HPT) were investigated using experimental and simulation approaches. The results indicated that the deformation..... More

      
716 Effect of Aluminum Welding Wire Mg Content on the Mechanical Properties of Al 5083 Alloy Weld Metal
Al 5083 합금 용접부의 기계적 물성에 미치는 Mg의 영향
Dongyoon Kim, Dongcheol Kim, Munjin Kang, Young-Min Kim
김동윤, 김동철, 강문진, 김영민
Korean J. Met. Mater. 2017;55(10):716-723.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.716

Abstract
A new aluminum welding wire with 0.8 wt% higher in Mg content was developed and compared with commercial welding wire of the 5000 series. The weldability of the Al5083 base material was evaluated using high current metal inert gas (MIG) welding, using the developed Al5183 and commercial Al5183 welding wire...... More

      
724 Separation of Rhenium (VII) and Vanadium (V) from Hydrochloric Acid Solutions by Solvent Extraction
Thi Hong Nguyen, Hoai Thanh Truong, Man Seung Lee
Korean J. Met. Mater. 2017;55(10):724-731.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.724

Abstract
The separation of Re(VII) and V(V) by solvent extraction with TBP was investigated by varying the HCl, metal and chloride ion concentrations. Re(VII) was selectively extracted over V(V) from the HCl solution. The highest separation between Re(VII) and V(V) occurred at a concentration of 2.0 M HCl. The extraction reaction..... More

      
732 Microstructure and Mechanical Properties of As-cast CoCrFeMnNi High Entropy Alloy
CoCrFeMnNi 고엔트로피합금 주조재의 미세조직 및 기계적 특성
Minju Kang, Jong Woo Won, Ka Ram Lim, Sang Hyeop Park, Seong Moon Seo, Young Sang Na
강민주, 원종우, 임가람, 박상협, 서성문, 나영상
Korean J. Met. Mater. 2017;55(10):732-738.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.732

Abstract
In this study, we made large-scale ingots of CoCrFeMnNi high entropy alloy by vacuum induction melting. The as-cast CoCrFeMnNi high entropy alloy contained a high proportion of columnar structures with a few equiaxed grains, and showed single phase fcc solid solutions without macro segregation and low interstitial levels. The tensile..... More

         Cited By 1
739 Electrical and Optical Investigation of the Growth Behavior of Au Nanoparticles Fabricated on Various Matrix Materials by the Alternating Sputtering Method
교번스퍼터링법에 의해 다양한 기지상 재료위에 형성된 Au 나노입자의 성장거동에 대한 전기, 광학적 분석
Bum-Joon Kim, Hyun Chul Kim, Jong-Geon Park, Kyeong-Seok Lee
김범준, 김현철, 박종건, 이경석
Korean J. Met. Mater. 2017;55(10):739-744.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.739

Abstract
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface plasmons. In this study, we employed an alternating sputtering method to fabricate such nanocomposite films...... More

      
745 The Social Implications of Technological Variability as Observed in High Tin Bronze Objects of the Unified Silla
통일신라의 고주석 청동기에서 확인되는 제작기술의 다양성과 이에 투영된 사회적 변화에 관한 연구
Jang Sik Park, Jin Ok Joo
박장식, 주진옥
Korean J. Met. Mater. 2017;55(10):745-751.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.745

Abstract
Korea is famous for more than a millennium of continuous fabrication of Cu-Sn objects with near peritectic composition through a process of forging and rapid cooling at approximately 700 °C. We examined four high tin bronze hairpins excavated from two Unified Silla sites in Gyongju and found substantial variability reflecting..... More

      
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