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Volume 57(2); Feb 2019
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Research Papers
279 Investigation of the Texture and Dislocation Behavior of AZ31 Magnesium Alloy Under Different Strain Rate Conditions
변형률 속도에 따른 AZ31 Mg 합금의 집합조직 및 전위 거동 관찰
Dong-Gi Lee, Jun-Beom Kwon, Hyun-Jong Lee, Su-Mi Jo, oung-Mok Rhyim, Won-Jon Yang, Yang-do Kim
이동기, 권준범, 이현종, 조수미, 임영목, 양원존, 김양도
Korean J. Met. Mater. 2019;57(5):279-288.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.279

Abstract
This study is concerned with the influence of strain rate on the plastic deformation behavior and microstructure variables of AZ31 magnesium alloy sheet. The tensile properties were measured at room temperature at a strain rate of 0.001 and 100 s–1 using a universal tensile testing machine and servo-hydraulic high-speed tensile..... More

                        
289 Characterization of Viscoelastic Behavior of Poly(dimethylsiloxane) by Nanoindentation
Jong-hyoung Kim, Jinwoo Lee, Woojoo Kim, Jongheon Kim, Seung-Kyun Kang, Dongil Kwon
Korean J. Met. Mater. 2019;57(5):289-294.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.289

Abstract
In this study, we characterize the viscoelastic behavior of polymers using nanoindentation. We applied the indentation representative stress approach and elastic solution to the Maxwell model and determined that there was a linear relationship between the inverses of the initial unloading stiffness and indentation unloading rate. From nanoindentation tests with..... More

                        
295 Room and Elevated Temperature Compressive Deformation Behavior of AISI 316L Alloy Fabricated by Selective Laser Melting Process
Selective laser melting 공정으로 제조된 AISI 316L 합금의 상온 및 고온 압축 변형 거동
Gi-Su Ham, Soon-Hong Park, Kee-Ahn Lee
함기수, 박순홍, 이기안
Korean J. Met. Mater. 2019;57(5):295-303.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.295

Abstract
This study investigated the microstructure and compressive properties (at room & high temperatures) of Fe-Cr-Ni based AISI 316L alloy, manufactured by selective laser melting process. The effect of stress relieving heat treatment on the microstructure and mechanical properties also examined. Regardless of the stress relieving heat treatment, the SLMed AISI..... More

                        
304 Property Evaluation of Binderless-WC Hard Materials as a Function of Sintering Temperature
소결온도 변화에 따른 Binderless-WC 소결체 특성평가
Hyun-Kuk Park, Jeong-Han Lee, Jun-Ho Jang, Ik-Hyun Oh
박현국, 이정한, 장준호, 오익현
Korean J. Met. Mater. 2019;57(5):304-309.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.304

Abstract
In this study, Binderless-WC hard materials were fabricated using the pulsed current activated sintering (PCAS) process for a Friction Stir Welding tool and difficult-to-cut tool application. Tungsten carbide (WC) hard materials are used in various industries and possess a superior hardness compared to other hard materials. They have particularly high..... More

                        
310 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

                        
316 Optimization of Flexible, Transparent TiO2/Cu/ZnO Electrodes by Simultaneous Suppression of Optoelectrical Losses and Pinhole Formation
광전 손실과 핀홀 생성의 억제를 통한 유연 투명 TiO2/Cu/ZnO 전극의 최적화 연구
Eunwook Jeong, Gun-Hwan Lee, Young-Rae Cho, Jungheum Yun
정은욱, 이건환, 조영래, 윤정흠
Korean J. Met. Mater. 2019;57(5):316-323.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.316

Abstract
We demonstrated an effective method for fabricating a highly efficient flexible transparent electrode in an oxide/metal/oxide configuration based on an ultrathin Cu film. It exhibited low losses in optical transmittance and electrical conductivity while minimizing current loss due to pinhole-related leakages. The Cu film was developed on a chemically heterogeneous..... More

                        
324 Influence of Film Thickness on the Electrical and Optical Properties of ZnO/Ag/SnO2 Tri-Layer Films
ZnO/Ag/SnO2 적층박막의 두께 변화에 따른 전기적, 광학적 특성 연구
Yu-Sung Kim, Jin-Young Choi, Yun-Je Park, Su-Hyeon Choe, Young-Min Kong, Daeil Kim
김유성, 최진영, 박윤제, 최수현, 공영민, 김대일
Korean J. Met. Mater. 2019;57(5):324-327.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.324

Abstract
ZnO/Ag/SnO2 (ZAS) tri-layer films were prepared on glass substrates via RF and DC magnetron sputtering, and then the influence of the thickness of the ZnO and SnO2 layers on the optical and electrical properties of the ZAS films was investigated. As deposited ZnO 50 nm/Ag 10 nm/SnO2 50 nm films..... More

                        
328 Electronic Transport and Thermoelectric Properties of Cu12-xZnxSb4S13 Tetrahedrites Prepared by Mechanical Alloying and Hot Pressing
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2019;57(5):328-333.   Published online 2019 Apr 10
DOI: https://doi.org/10.3365/KJMM.2019.57.5.328

Abstract
Tetrahedrite Cu12Sb4S13 has low lattice thermal conductivity because of the lone-pair electrons of Sb, which cause the Cu atoms to vibrate at a low frequency and high amplitude. When the Cu atoms of Cu12Sb4S13 are partially substituted with a transition metal, changes in the Cu vibrations can intensify phonon scattering,..... More

                        
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