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Table of Contents | April, 2020  Vol. 58   No.4 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
217 Effects of Ni and Cu Addition on Tensile Properties and Thermal Conductivity of High Pressure Die-cast Al-6Si Alloys
고압 다이캐스팅 Al-6Si계 합금의 인장특성 및 열전도성에 미치는 Ni과 Cu 첨가 영향
Jae-Cheol Jang, Kwang Seon Shin
장재철, 신광선
Korean J. Met. Mater. 2020;58(4):217-226.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.217

In this study, the effects of nickel and copper on the mechanical and thermal properties of Al-Si alloys were investigated, for different alloy compositions. Thermodynamic calculations were carried out to predict the alloys’ solidification behavior (solidification temperature, solid fraction and physical properties (density, thermal conductivity, elastic modulus, bulk modulus)). The..... More

227 Compressive Behavior of 316L Stainless Steel Lattice Structures Fabricated by Selective Laser Melting
SLM공정에 의해 제조된 316L 스테인레스 스틸 격자구조체의 압축 거동 평가
Jin-Myeong Lee, Jung-Eum Lee, Ji-Hoon Kim, Sang-Woo Kim
이진명, 이정음, 김지훈, 김상우
Korean J. Met. Mater. 2020;58(4):227-233.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.227

Lattice structures are multi-functional materials with various advantages such as high specific stiffness, high energy absorption capacity and good thermal management capability. Recently, the development of manufacturing technologies using metal powders has facilitated fabrication of complex products; consequently, interest in lattice structures has grown. In this work, two kinds of..... More

234 Oxidation of Ni-Cr-Co-Al-Mo-Ti-Re-Ta-W-Ru Single Crystals at 1000 oC in Air
Ni-Cr-Co-Al-Mo-Ti-Re-Ta-W-Ru 단결정의 대기중 1000 oC에서의 산화
Junhee Hahn, Xiao Xiao, Dong Bok Lee
한준희, Xiao Xiao, 이동복
Korean J. Met. Mater. 2020;58(4):234-246.   Published online 2020 Mar 11
DOI: https://doi.org/10.3365/KJMM.2020.58.4.234

Three kinds of Ni-based single crystals with the compositions of 63.8Ni-7.5Cr-5.1Co-4.8Al-1.9Mo- 0.9Ti-3Re-11.8Ta-1.2W, 61.4Ni-7.4Cr-5Co-4.8Al-1.8Mo-0.9Ti-3.1Re-11.6Ta-4W, and 60.9Ni-7.5Cr-5Co-4.8Al- 2Mo-1Ti-2.9Re-10.9Ta-1.2W-3.8Ru, in wt%, were cast in a Bridgman furnace. In the cast alloys, Cr, Co, Re, Mo, W, and Ru became microsegregated in dendrites consisting of γ-Ni, while Ni, Ta, and Al microsegregated in interdendrites..... More

247 Nanostructuring Behavior of NiCrBSi and CoCrWC Thermal Spray Coatings Formed by Temperature-Controlled Laser Heat Treatment
온도 제어형 레이저 열처리에 따른 NiCrBSi 및 CoCrWC 용사 코팅층의 나노구조 형성 거동
Eun-Joon Chun
Korean J. Met. Mater. 2020;58(4):247-256.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.247

.For surface hardening of a continuous casting mold component, a thermal spray coating of NiCrBSi (Metco-16C) and CoCrWC (Stellite-1) was performed followed by laser heat treatment of the coatings. To support selective modification of the thermal spray coating, a metallurgically determined surface temperature was maintained during the laser heat treatment,..... More

                           Cited By 1
257 Effect of Sintering Temperature on the Characteristics of Zn0.99Li0.01O Thin Film on Si Substrate
Gang Bae Kim, June Won Hyun
Korean J. Met. Mater. 2020;58(4):257-262.   Published online 2020 Apr 5
DOI: https://doi.org/10.3365/KJMM.2020.58.4.257

Lithium-doped zinc oxide (Zn0.99Li0.01O) film was manufactured by the sol-gel method using uniform and stable solution of zinc acetate dehydrate and lithium acetate dehydrate in methanol. Films were deposited by spin-coating using spinner between 4500 and 5000 rpm on silicon substrates. The prepared samples were sintered at various temperatures (600..... More

263 Effects of Growth Temperature on the Physicochemical and Photoelectrochemical Properties of a Modified Chemical Bath Deposited Fe2O3 Photoelectrode
개선된 화학 용액 증착법 성장 온도에 따른 Fe2O3 광전극의 물리화학적 및 광전기화학적 특성 연구
Yaejin Hong, Seung-Hwan Jeon, Hyukhyun Ryu, Won-Jae Lee
홍예진, 전승환, 류혁현, 이원재
Korean J. Met. Mater. 2020;58(4):263-271.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.263

In this study, Fe2O3 photoelectrode thin films were grown on fluorine-doped tin oxide substrates at various temperatures ranging from 145 to 220 oC using modified chemical bath deposition. The morphological, structural, electrical, and photoelectrochemical properties of the resulting Fe2O3 photoelectrode were analyzed using field emission scanning electron microscopy, X-ray diffraction,..... More

272 Solid-State Synthesis and Thermoelectric Properties of Tetrahedrites Cu12Sb4-yBiyS13
Sung-Gyu Kwak, Ji-Hee Pi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2020;58(4):272-277.   Published online 2020 Mar 9
DOI: https://doi.org/10.3365/KJMM.2020.58.4.272

Tetrahedrite 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. The synthesis of tetrahedrite compounds by conventional melting methods requires a long-time reaction and annealing. However, a homogeneous and solid-state synthesis can be..... More

278 Effects of Jetting Parameters and Sodium Silicate-Based Binder on Droplet Formation
액적 형성에 미치는 물유리계 바인더의 조성과 토출조건의 영향
Seongeun Pyeon, Man Sig Lee, Dae-Won Park, Jae Ho Baek
편성은, 이만식, 박대원, 백재호
Korean J. Met. Mater. 2020;58(4):278-285.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.278

Binder jetting additive manufacturing is one of the 3D printing technologies currently used to manufacture 3D geometries. In this process, a liquid binder agent is ejected to a desired position of a substrate. The binder’s properties and the jetting condition used for form droplets can affect the formability of the..... More

286 A Method of Synthesizing Lithium Hydroxide Nanoparticles Using Lithium Sulfate from Spent Batteries by 2-Step Precipitation Method
Soyeong Joo, Hyun-Woo Shim, Jin-Ju Choi, Chan-Gi Lee, Dae-Guen Kim
Korean J. Met. Mater. 2020;58(4):286-291.   Published online 2020 Mar 10
DOI: https://doi.org/10.3365/KJMM.2020.58.4.286

In this work, LiOH was synthesized using highly soluble Li2SO4. To enhance efficiency, this synthesis was performed using the precipitation method, and the correlation between each experimental condition and the synthesis of LiOH was investigated. The particle size and crystalline properties were tailored by controlling various experimental conditions, including the..... More

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