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Table of Contents | December, 2018  Vol. 56   No.12 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
845 Effect of Microstructural Factors on Fatigue and Fatigue Crack Propagation Behaviors of Mill-Annealed Ti-6Al-4V Alloy
미세조직적 인자가 밀소둔된 Ti-6Al-4V 합금의 피로 및 피로균열전파 거동에 미치는 영향
Sanghoo Park, Sumin Kim, Daeun Lee, Soojin Ahn, Sangshik Kim
박상후, 김수민, 이다은, 안수진, 김상식
Korean J. Met. Mater. 2018;56(12):845-853.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.845

To understand the effect of microstructural factors (i.e., the size of α phase, equiaxed vs bimodal structure) on high cycle fatigue (HCF) and fatigue crack propagation (FCP) behaviors of mill-annealed Ti-6Al- 4V (Ti64) alloy, three specimens of EQ (equiaxed)–8 (8 indicates the size of α grain), BM (bimodal)-8, and BM-..... More

854 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

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

861 Effect of Shear Deformation During Drawing on Inhomogeneous Microstructures and Textures in High Purity Copper Wires After Annealing
고순도 구리 선재의 어닐링 후 불균질 미세조직과 집합조직에 미치는 신선 시 전단 변형의 영향
Hyun Park, Sang-Hyeok Kim, Se-Jong Kim, Hyo-Jong Lee
박현, 김상혁, 김세종, 이효종
Korean J. Met. Mater. 2018;56(12):861-869.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.861

To determine the origin of the inhomogeneous microstructure and texture observed in drawn and annealed high purity copper wires, two kinds of drawing process conditions and their influence was investigated. The regular condition, based on a symmetric die, and a condition designed intentionally to produce an inhomogeneous shear deformation using..... More

870 Solvent Extraction of Tb(III) from Hydrochloric Acid Solution with Cyanex 272, Its Mixture and Ionic Liquid
염산용액에서 Cyanex 272 및 혼합용매와 이온성 액체에 의한 Tb(III)의 용매추출
Chang Geun Oh, Man Seung Lee
오창근, 이만승
Korean J. Met. Mater. 2018;56(12):870-877.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.870

Cyanex 272 shows the highest separation factor for the rare earth elements from hydrochloric acid solution among the organophosporus acidic extractants, D2EHPA and PC 88A. Solvent extraction of Tb(III) from weak hydrochloric acid solution with an initial pH 3 to 6 was compared with Cyanex 272, its mixture with Alamine..... More

878 Hydrogen Storage Properties of Mg Alloy Prepared by Incorporating Polyvinylidene Fluoride via Reactive Milling
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2018;56(12):878-884.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.878

In the present work, we selected a polymer, polyvinylidene fluoride (PVDF), as an additive to improve the hydrogenation and dehydrogenation properties of Mg. 95 wt% Mg + 5 wt% PVDF (designated Mg-5PVDF) samples were prepared via milling in hydrogen atmosphere (reactive milling), and the hydrogenation and dehydrogenation characteristics of the..... More

885 MoS2/CNFs derived from Electrospinning and Heat treatment as the Efficient Electrocatalyst for Hydrogen Eovlution Reaction in Acidic Solution
전기 방사를 이용한 1D / 2D 하이브리드 구조 고활성 MoS2 / CNF 수소 발생 촉매의 합성 및 특성 분석
Jeong Hun Lee, Yoo Sei Park, Myeong Je Jang, Sung Min Park, Kyu Hwan Lee, Woo Sung Choi, Sung Mook Choi, Yang Do Kim
이정훈, 박유세, 장명제, 박성민, 이규환, 최우성, 최승목, 김양도
Korean J. Met. Mater. 2018;56(12):885-892.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.885

Molybdenum disulfide (MoS2) based electrocatalysts have been proposed as substitutes for platinum group metal (PGM) based electrocatalyst to hydrogen evolution reaction (HER) in water electrolysis. Here, we studied MoS2/CNFs hybrid catalyst prepared by electrospinning method with heat treatment for polymer electrolyte membrane(PEM) water electrolysis to improve the HER activity. The..... More

893 Sulfur Poisoning of Ni Anode as a Function of Operating Conditions in Solid Oxide Fuel Cells
고체산화물 연료전지의 운전 조건에 따른 니켈 전극 황 피독 현상
Ho Seong Lee, Hyun Mi Lee, Hyung-Tae Lim
이호성, 이현미, 임형태
Korean J. Met. Mater. 2018;56(12):893-899.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.893

In the present study, we investigated the sulfur poisoning of the Ni anode in solid oxide fuel cells (SOFCs) as a function of operating conditions. Anode supported cells were fabricated, and sulfur poising tests were conducted as a function of current density, H2S concentration and humidity in the anode gas...... More

900 Synthesis and Characterization of ZnO/TiO2 Photocatalyst Decorated with PbS QDs for the Degradation of Aniline Blue Solution
Jong-Ho Lee, Hong-Joo Ahn, Jeong-Il Youn, Young-Jig Kim, Su-Jeong Suh, Han-Jun Oh
Korean J. Met. Mater. 2018;56(12):900-909.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.900

A ZnO/TiO2 photocatalyst decorated with PbS quantum dots (QDs) was synthesized to achieve high photocatalytic efficiency for the decomposition of dye in aqueous media. A TiO2 porous layer, as a precursor photocatalyst, was fabricated using micro-arc oxidation, and exhibited irregular porous cells with anatase and rutile crystalline structures. Then, a..... More

910 Pattern Formation of Highly Ordered Sub-20 nm Pt Cross-Bar on Ni Thin Film
Ni 박막 위 20 nm급 고정렬 Pt 크로스-바 구조물의 형성 방법
Tae Wan Park, Hyunsung Jung, Young-Rae Cho, Jung Woo Lee, Woon Ik Park
박태완, 정현성, 조영래, 이정우, 박운익
Korean J. Met. Mater. 2018;56(12):910-914.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.910

Since catalyst technology is one of the promising technologies to improve the working performance of next generation energy and electronic devices, many efforts have been made to develop various catalysts with high efficiency at a low cost. However, there are remaining challenges to be resolved in order to use the..... More

915 Effect of CaF2 Addition on the Crystallinity of Hexagonal Boron Nitride Nanoparticles
육방정 질화붕소 나노입자의 결정성에 미치는 불화칼슘 첨가의 영향
Jae-Yong Jung, Yang-Do Kim, Young-Kuk Kim
정재용, 김양도, 김영국
Korean J. Met. Mater. 2018;56(12):915-920.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.915

With the development of modern microelectronics technologies, the power density of electronic devices is rapidly increasing, due to the miniaturization or integration of device elements which operate at high frequency, high power conditions. Resulting thermal problems are known to cause power leakage, device failure and deteriorated performance. To relieve heat..... More

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