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Effect of Pre-Aging Treatment on Bake-Hardenability of Al-8.0Zn-2.5Mg-2.0Cu Alloy Sheet Fabricated by Twin-Roll Casting Process
박판주조공정으로 제조한 Al-8.0Zn-2.5Mg-2.0Cu 합금 판재의 소부경화특성에 미치는 예비시효의 영향
Ji-Goo Heo, Yun-Soo Lee, Min-Seok Kim, Hyoung-Wook Kim, Yang-Do Kim
허지구, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater. 2019;57(6):396-404.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.396

Abstract
The effects of natural and pre-aging on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-2.0Cu aluminum alloy sheet fabricated by twin roll casting were investigated. Immediately after solution treatment, the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet had a yield strength of 173 MPa and elongation of 19.5%. The hardness of the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet..... More

                        
Effect of BN Addition on the Mechanical Properties of AlN
AlN 기계적 성질에 미치는 BN 첨가 영향
Woo-Jin Cho, Se-Hoon Oh, In-Jin Shon
조우진, 오세훈, 손인진
Korean J. Met. Mater. 2019;57(5):310-315.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.310

Abstract
Aluminum nitride (AlN) has several attractive properties including high thermal conductivity, excellent electrical insulation, a thermal expansion coefficient close to that of Si and low density. Accordingly, it is considered a promising packing material and substrate for high power integrated circuits. However, its low fracture toughness at room temperature limits..... More

                        
Investigation of the Mechanical/Thermal Properties of Nano-Scale Silicon Nitride Membranes
나노스케일 질화규소 멤브레인의 기계적, 열적 특성 분석
Yong Ju Jang, Hyeon-Jin Shin, Seong Ju Wi, Ha Neul Kim, Gi Sung Lee, Jinho Ahn
장용주, 신현진, 위성주, 김하늘, 이기성, 안진호
Korean J. Met. Mater. 2019;57(2):124-129.   Published online 2019 Jan 9
DOI: https://doi.org/10.3365/KJMM.2019.57.2.124

Abstract
In micro/nano electro-mechanical system, silicon nitride (SiNx) membrane has been widely used in sensors, energy harvesting and optical filters because of its mechanical/chemical stability. However, it is necessary to verify mechanical and thermal properties of nanoscale SiNx membranes to ensure the desirable reliability and durability of a device because the..... More

                        
Rapid Sintering of Nanocrystalline (W,Ti)C-Graphene Composites
나노구조 (W,Ti)C-Graphene 복합재료 급속소결
Seong-Eun Kim, In-Jin Shon
김성은, 손인진
Korean J. Met. Mater. 2018;56(12):854-860.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.854

Abstract
In spite of the many attractive properties of (W,Ti)C, its low fracture toughness limits its wide application. To improve the fracture toughness generally a second phase is added to fabricate a nanostructured composite. In this regard, graphene was considered as the reinforcing agent of (W,Ti)C. (W,Ti)C-graphene composites that were sintered..... More

                        
Effect of Gelatin and Chloride Ions on the Mechanical Properties and Microstructural Evolution of Copper Foil
젤라틴 및 염소이온 첨가에 의한 구리 박막의 미세조직 및 기계적 특성 고찰
Tae-Gyu Woo, Man-Hyung Lee, Kyeong-Won Seol
우태규, 이만형, 설경원
Korean J. Met. Mater. 2018;56(7):518-523.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.518

Abstract
This study investigated the crystal structure and mechanical properties of copper foil electroplated by adjusting gelatin and chloride ions from 0 to 100 ppm. There was increased formation of spherical crystals and surface roughness on the surface of the electroplated layer when the gelatin was added, and the direction of..... More

                        
Main Effects of Plating Parameters on Mechanical and Surface Properties of Electroplated Copper
구리 전해도금 변수의 기계적 특성 및 표면 특성에 미치는 주 효과 분석
Tae-Gyu Woo, Il-Song Park, Kyeong-Won Seol
우태규, 박일송, 설경원
Korean J. Met. Mater. 2018;56(6):459-464.   Published online 2018 Jun 4
DOI: https://doi.org/10.3365/KJMM.2018.56.6.459

Abstract
Electroplated copper has been used as wiring in electronic circuit boards and as cathode materials for secondary batteries, and its usage has expanded into the construction industry because of its convenient production and high economic value. During the electroplating process, various parameters, such as crystal phase and size, can affect..... More

                        
Effect of Hot Isostatic Pressing on the Microstructure and RoomHigh Temperature Tensile Properties of Fe-Cr-Ni based HK30 Alloy Manufactured by Metal Injection Molding Process
Metal Injection Molding 공정으로 제조된 Fe-Cr-Ni계 HK30 합금의 미세조직 및 상·고온 인장 특성에 미치는 열간 등압 성형의 영향
Young-Kyun Kim, Tae-Sik Yoon, Kee-Ahn Lee
김영균, 윤태식, 이기안
Korean J. Met. Mater. 2018;56(2):121-129.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.121

Abstract
This study manufactured Fe-Cr-Ni-based alloy (HK30) using the metal injection molding (MIM) process and investigated the microstructure and room·high temperature mechanical properties of the material. The effect of hot isostatic pressing (HIP) on properties was also examined. The average grain sizes were 24.1 µm for an MIM specimen and 29.1..... More

      
Effects of Solution and Aging Treatments on the Microstructure and Mechanical Properties of Al-5.2Si-3.4Cu-0.28Mg Alloy
Al-5.2Si-3.4Cu-0.28Mg 합금의 미세조직 및 기계적 특성에 미치는 용체화 및 시효 열처리의 영향
Yi Je Cho, Jeki Jung, Yong Ho Park
조의제, 정제기, 박용호
Korean J. Met. Mater. 2017;55(12):888-895.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.888

Abstract
Since strength and ductility have a trade-off relationship in Al alloys, controlling these properties using heat treatments requires careful attention to the dissolution and evolution of the reinforcing phases. In this study, the effects of solution and aging treatments on the microstructure and mechanical properties of Al-5.2Si-3.4Cu-0.28Mg alloy were investigated...... More

      
Sintering of a Nanostructured CoZr-ZrO<sub>2</sub> Composite from Mechanochemically Synthesized Powders
기계화학적 합성과 나노구조 CoZr-ZrO2 복합재료 소결
In-Jin Shon, Jin-Kook Yoon, Kyung-Tae Hong
손인진, 윤진국, 홍경태
Korean J. Met. Mater. 2017;55(9):632-636.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.632

Abstract
Since their development in the 1970s ZrO2 ceramics have been shown to be promising alternative materials for total hip arthroplasty (THA) and total knee arthroplasty (TKA). However, ZrO2 is so brittle that in vivo failure can result from fracture of the ceramic femoral head and fracture of the ceramic acetabular..... More

      
Effect of Al and Zr Contents on Mechanical Properties of Ni-Al-Bronze
니알브론즈의 기계적 특성에 미치는 알루미늄 및 지르코늄 함량의 영향
Jee Hyuk Ahn, Dong Wook Kim, Min Soo Kim, Jong-Hyun Hwang, Seung Zeon Han
안지혁, 김동욱, 김민수, 황종현, 한승전
Korean J. Met. Mater. 2017;55(8):537-543.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.537

Abstract
To study the effect of Al and Zr contents on the microstructural changes and tensile properties of Ni-Al-Bronze alloy, seven specimens were cast with different Al and Zr contents. The microstructure observation revealed that all specimens were composed of β’ and κ phases in a α matrix. With increasing Al..... More

      
High-strength Ti Alloy Prepared via Promoting Interstitial-Carbon Diffusion
침입형 탄소 확산을 이용하여 제조한 고강도 Ti 합금
Bo-Young Kim, Se-Hyun Ko, Jae-Chul Lee
김보영, 고세현, 이재철
Korean J. Met. Mater. 2017;55(5):342-347.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.342

Abstract
Feasibility studies are performed to determine the suitability of a novel simple synthesis technique for fabricating a new Ti alloy with improved strength and ductility, while exhibiting lower cell toxicity. Through consolidating pure Ti powders under a C atmosphere at elevated temperatures, a bulk form of the Ti alloy, in..... More

      
The Effect of Ultrasonic Melt Treatment on the Microstructure and Mechanical Properties of Al-7Si-0.35Mg Casting Alloys
초음파 용탕 처리가 Al-7Si-0.35Mg 알루미늄 합금의 미세조직 및 기계적 특성에 미치는 영향
Soo-Bae Kim, Young-Hee Cho, Jung-Moo Lee, Jae-Gil Jung, Su Gun Lim
김수배, 조영희, 이정무, 정재길, 임수근
Korean J. Met. Mater. 2017;55(4):240-246.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.240

Abstract
The effect of ultrasonic melt treatment (UST) on the microstructure and mechanical properties of Al-7Si-0.35Mg (A356) casting alloys was investigated. The particular aim of this study was to analyze the mechanism involved in the strengthening of the A356 alloys when fabricated by UST. The UST had little effect on the..... More

         Cited By 1
Effect of Graphene Addition on Mechanical Properties of TiN
그래핀 첨가가 TiN 기계적 성질에 미치는 영향
In-Jin Shon, Jin-Kook Yoon, Kyung-Tae Hong
손인진, 윤진국, 홍경태
Korean J. Met. Mater. 2017;55(3):179-183.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.179

Abstract
Despite of many attractive properties of TiN, the current concern about the TiN focuses on its low fracture toughness below the ductile-brittle transition temperature. To improve its mechanical properties, the approach generally utilized has been the addition of a second phase to form composites and to make nanostructured materials. In..... More

      
Influence of Nickel Thickness and Annealing Time on the Mechanical Properties of Intermetallic Compounds Formed between Cu-Sn Solder and Substrate
Cu-Sn계 솔더와 기판 사이의 Ni층의 두께와 열처리 시간에 따른 금속간화합물의 기계적 특성
Yiseul Kim, Jeehye Kwon, Dayoung Yoo, Sungkyu Park, Dajeong Lee, Dongyun Lee
김이슬, 권지혜, 유다영, 박성규, 이다정, 이동윤
Korean J. Met. Mater. 2017;55(3):165-172.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.165

Abstract
Intermetallic compounds (IMCs) developed on the interface between a solder alloy and its bonding pads are an important factor in the failure of electronic circuits. In this study, the mechanical behaviors of the IMCs formed in the Cu-Ni-Sn ternary alloy system are investigated. Presumably, Ni can act as a diffusion..... More

      
Effect of Graphene Addition on the Mechanical Properties of TiO<sub>2</sub>
TiO2 기계적 성질에 미치는 그래핀 첨가 영향
In-Jin Shon
손인진
Korean J. Met. Mater. 2017;55(2):110-114.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.110

Abstract
Despite of the many attractive properties of TiO2, its low fracture toughness limits many industrial applications. To improve its fracture toughness, the approach commonly utilized has been the addition of a second phase, to form composites, and to make nanostructured composites. In this regard, highly dense nanostructured TiO2 and TiO2-graphene..... More

         Cited By 3
Effect of Added Gas-Atomized Al-Si/SiC<sub>p</sub> Composite Powder on the Sinterability and Mechanical Properties of Alumix 431 fabricated by Hot-Pressing Process
Eunsun Lee, Jeong-Jung Oak, Yongjin Kim, Yongho Park
Korean J. Met. Mater. 2017;55(2):98-109.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.98

Abstract
The aim of this study is to establish an optimized hot-press sintering condition for aluminum matrix composites (AMCs) by analyzing their sintered microstructure and mechanical properties. The fabricated AMCs in this study consisted of a blend of commercial Ecka Alumix 431 powder, and Al-Si/SiCp powder manufactured by gas atomizer (Al-Si/SiCp)...... More

      
Study on the Mechanical Properties and Corrosion Behaviors of Fe-(20, 45) wt% Gd Intermetallics
Fe-(20, 45) wt% Gd 금속간 화합물의 기계적 특성 및 부식 거동 연구
Bo Kyeong Kang, Youl Baik, Yong Choi, Byung Moon Moon
강보경, 백열, 최용, 문병문
Korean J. Met. Mater. 2017;55(2):91-97.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.91

Abstract
Fe-(20, 45 wt%) Gd intermetallics were vacuum arc melted as the mother alloy of a neutron shielding and absorbing material. The structure of the cast Fe-20 wt% Gd intermetallics had primary dendrites with a short width of about 2 μm, which became coarse with increasing Gd content. The final compositions..... More

      
Modeling and Simulation
Numerical Simulation of Yttrium Aluminum Garnet(YAG) Single Crystal Growth by Resistance Heating Czochralski(CZ) Method
저항가열 초크랄스키법에 의한 야그 단결정 성장의 전산모사 연구
Myeong Hyeon You, Pil Ryung Cha
유명현, 차필령
Korean J. Met. Mater. 2017;55(1):60-66.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.60

Abstract
Yttrium Aluminum Garnet (YAG) single crystal has received much attention as the high power solid-state laser’s key component in industrial and medical applications. Various growth methods have been proposed, and currently the induction-heating Czochralski (IHCZ) growth method is mainly used to grow YAG single crystal. Due to the intrinsic properties..... More

      
Plastic Working & Materials Processing
The Effect of Mixed Slurry of Fe and Graphite on the Characteristics of Laser Carburized Surface
레이저 침탄공정시 철과 흑연의 혼합 슬러리가 침탄특성에 미치는 효과
Won-Jong Ji, Seong-Hoon Lee, Young-Hoon Moon
지원종, 이성훈, 문영훈
Korean J. Met. Mater. 2017;55(1):16-23.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.16

Abstract
Laser surface carburizing can be achieved by a laser alloying mechanism, which includes melting the graphite coated substrate and dissolution of the graphite in the liquid state. The drawback of laser carburizing is that process-induced cracks frequently form on the carburized surface as a result of carbon enrichment and the..... More

         Cited By 3
Effect of Aging Time and Temperature on Microstructure and Mechanical Properties of Ti-39Nb-6Zr Alloy
Ti-39Nb-6Zr 합금의 시효처리를 통한 미세조직 및 기계적 특성 제어
Hyun Jun Kwon, Ka Ram Lim, Yong Tae Lee, Dong Geun Lee, Jun Hee Lee, Seung Eon Kim
권현준, 임가람, 이용태, 이동근, 이준희, 김승언
Korean J. Met. Mater. 2016;54(12):925-930.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.925

Abstract
The aim of this study is to optimize the microstructure and mechanical properties of Ti-39Nb-6Zr (TNZ40) for bio-implant applications. TNZ40 was designed to have a low elastic modulus (~40 GPa) and good biocompatibility. However, the alloy shows relatively low strength compared to other titanium alloys for bio-implant. In the present..... More

         Cited By 1
Effect of Bonding Pressure and Bonding Time on the Tensile Properties of Cu-Foam / Cu-Plate Diffusion Bonded Joint
Cu foam / Cu plate 간 고상확산접합부의 인장성질에 미치는 접합압력과 유지시간의 영향
Sang-Ho Kim, Hoe-Jun Heo, Tae-Jin Yoon, Chung-Yun Kang
김상호, 허회준, 윤태진, 강정윤
Korean J. Met. Mater. 2016;54(12):899-907.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.899

Abstract
Open cell Cu foam, which has been widely utilized in various industries because of its high thermal conductivity, lightweight and large surface area, was successfully joined with Cu plate by diffusion bonding. To prevent excessive deformation of the Cu foam during bonding process, the bonding pressure should be lower than..... More

      
Rapid Sintering of Nanocrystalline SiC-Graphene Composites
나노구조 SiC-Graphene 복합재료 급속소결
In-Jin Shon
손인진
Korean J. Met. Mater. 2016;54(12):893-898.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.893

Abstract
The low mechanical properties of SiC limit its wide application despite many attractive properties. To improve the mechanical properties, a second phase has been generally added to make a nanostructured composite. In this respect, graphene was evaluated as the reinforcing agent of SiC. SiC-graphene composites were sintered within 2 min..... More

         Cited By 2
Evaluation of Material Properties on the Inner Surface of Cr Plated Cladding Tube for Preventing Fuel-Cladding Chemical Interaction
FCCI 방지를 위한 내면 Cr 도금 피복관의 물성 평가
Jun Hwan Kim, Byoung Oon Lee, Jin Sik Cheon, Sung Ho Kim
김준환, 이병운, 천진식, 김성호
Korean J. Met. Mater. 2016;54(11):855-861.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.855
Abstract
Studies were carried out to apply electroplating technique to the inner surface of a nuclear fuel cladding tube to prevent a fuel-cladding chemical interaction (FCCI) in a sodium-cooled fast reactor (SFR). 20 μm thick Cr was uniformly plated onto the inner surface of a HT9 cladding tube with a 7.4... More
         Cited By 1
Synthesis and Rapid Sintering of Nanocrystalline CoTi-ZrO<sub>2</sub> Composite
나노구조 CoTi-ZrO2 복합재료 합성과 급속소결
In-Jin Shon
손인진
Korean J. Met. Mater. 2016;54(11):826-830.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.826

Abstract
CoTi and ZrO2 nanopowders were mechanochemically synthesized from CoTiO3 and Zr powders according to the reaction (2CoTiO3 + 3Zr → 2CoTi + 3ZrO2). The milled powders were then consolidated by pulsed current-activated sintering within two minutes under an applied pressure of 80MPa. The average hardness and fracture toughness of the..... More

         Cited By 3
The Effects of Cooling Rate on the Microstructure and Mechanical Properties of Ti<sub>40</sub>Zr<sub>10</sub>Cu<sub>36</sub>Pd<sub>14</sub> Metallic Glass Matrix Composites
Ti40Zr10Cu36Pd14 비정질기지 복합재의 미세조직과 기계적 특성에 미치는 냉각속도의 영향
Seon Yong Park, Ka Ram Lim, Young Sang Na, Seong Eon Kim, Youn Suk Choi
박선용, 임가람, 나영상, 김승언, 최윤석
Korean J. Met. Mater. 2016;54(11):802-807.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.802

Abstract
In this paper, we demonstrate that the microstructure and mechanical properties in the Ti40Zr10Cu36Pd14 alloy can be tailored by controlling the cooling rate during solidification. A lower cooling rate increases the volume fraction of crystalline phase such as B2 but decreases the free volume of the glassy matrix. The increase..... More

      
Experimental and Simulation Analysis of Hot Isostatic Pressing of Gas Atomized Stainless Steel 316L Powder Compacts
Dongguo Lin, Sangyul Ha, Youngho Shin, Dong Yong Park, Seong Jin Park, Sung Taek Chung, Ravi Bollina, Seongkyu See
Korean J. Met. Mater. 2016;54(10):732-742.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.732

Abstract
In this work, both experimental and numerical studies were conducted to investigate the densification behavior of stainless steel 316L (STS 316L) powders during hot isostatic pressing (HIP), and to characterize the mechanical properties of HIPed specimens. The HIP experiments were conducted with gas atomized STS 316L powders with spherical particle..... More

         Cited By 3
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