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Oxidation Behaviors of Alloys Containing /B2 Phases of Ti-45Al-Mo-Nb Alloys and Evaluation of the Oxidation Behaviors of Si Pack Cementation Coated Alloys
β/B2상을 포함한 Ti-Al-Mo-Nb 합금의 산화 거동과 실리콘 화합물 코팅을 통한 내산화성 개선
Kwangsu Choi, Youngbuem Song, Seonghoon Yi, Joon Sik Park
최광수, 송영범, 이승훈, 박준식
Korean J. Met. Mater. 2019;57(3):131-137.   Published online 2019 Feb 8
DOI: https://doi.org/10.3365/KJMM.2019.57.3.131

Alloys containing the β/B2 phases of Ti-45Al-3Mo, Ti-45Al-3Mo-2Nb and Ti-45Al-5Mo were prepared using an vacuum arc-melting machine. Heat-treatments were carried out at 1250 oC in an Ar atmosphere. The temperature of 1250 oC is the temperature region of phase α + γ + (β/B2), and the heat treatment condition which..... More

Mechanical Properties of Liquid Phase Sintered SiC Materials by the Addition of Unimodal and Bimodal Particles
단일 크기와 이중 크기의 탄화규소 입자를 이용한 액상소결 탄화규소의 기계적 특성
Jun Yeab Lee, Sang Pill Lee, Jin Kyung Lee, Moon Hee Lee, Seung Kuk Hwang
이준엽, 이상필, 이진경, 이문희, 황승국
Korean J. Met. Mater. 2019;57(1):60-66.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.60

Both the mechanical properties and probability distribution of liquid phase sintered SiC (LPS-SiC) materials were investigated, based on a detailed analysis of their microstructures. In particular, the effect of the starting sizes of SiC particles on the characterization of LPS-SiC materials was evaluated. LPS-SiC materials were fabricated with a constant..... More

Thermoelectric Properties of P-type (Ce<sub>1-z</sub>Yb<sub>z</sub>)<sub>0.8</sub>Fe<sub>4-x</sub>Co<sub>x</sub>Sb<sub>12</sub> Skutterudites
Deok-Yeong Choi, Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(11):822-828.   Published online 2018 Nov 5
DOI: https://doi.org/10.3365/KJMM.2018.56.11.822

P-type Ce/Yb-filled skutterudites were synthesized, and their charge transport and thermoelectric properties were investigated with partial double filling and charge compensation. In the case of (Ce1-zYbz)0.8Fe4Sb12 without Co substitution, the marcasite (FeSb2) phase formed alongside the skutterudite phase, but the generation of the marcasite phase was inhibited by increasing Co..... More

Charge Transport and Thermoelectric Properties of (La<sub>1z</sub>Pr<sub>z</sub>)<sub>0.8</sub>Fe<sub>4x</sub>Co<sub>x</sub>Sb<sub>12</sub> Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(10):772-778.   Published online 2018 Oct 5
DOI: https://doi.org/10.3365/KJMM.2018.56.10.772

Partially La/Pr-double-filled and Co-substituted (La1−zPrz)0.8Fe4−xCoxSb12 skutterudites were synthesized by encapsulated melting and vacuum hot pressing. (La,Pr)Sb2 phases were not formed because the partial filling did not exceed the filling fraction limit, and the amount of secondary phase FeSb2 also decreased as the Co content increased. Electrical conductivity decreased with increasing..... More

Effects of Short Range Ordering on Aging Phenomenon in Zr-2.5%Nb Pressure Tube Material
단 범위 규칙 반응이 Zr-2.5%Nb 압력관 재료의 시효(aging) 현상에 미치는 영향
Sung Soo Kim, Young Suk Kim, Jong Yeob Jung
김성수, 김영석, 정종엽
Korean J. Met. Mater. 2018;56(7):479-489.   Published online 2018 Jul 5
DOI: https://doi.org/10.3365/KJMM.2018.56.7.479

This study was conducted to investigate the effect of aging treatment from 300 °C to 420 °C on the mechanical properties of the pressure tube material at 310 °C, which is outlet temperature pressure tube in CANDU reactor. The short range ordering (SRO) phenomenon during aging process is confirmed by..... More

Thermoelectric Properties of Partially Double-filled (Ce<sub>1-z</sub>Nd<sub>z</sub>)<sub>y</sub>Fe<sub>4-x</sub>Co<sub>x</sub>Sb<sub>12</sub> Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater. 2018;56(6):465-471.   Published online 2018 Jun 4
DOI: https://doi.org/10.3365/KJMM.2018.56.6.465

(Ce1-zNdz)yFe4-xCoxSb12 skutterudites were prepared by encapsulated melting, annealing, and hot pressing. The formation of a marcasite phase (FeSb2) was significantly suppressed by partially filling the voids with Ce/Nd and making a Co substitution at the Fe site. Both the Hall and the Seebeck coefficient values were positive, indicating that all..... More

                           Cited By 2
Microstructural Evolution in Cast and HIPed Ingot Material of Beta Gamma TiAl Alloy by Two Step Cooling
Cast 와 HIP 으로 제작된 베타 감마 TiAl 합금의 열처리 후 2단계 냉각법을 통한 미세구조의 변화
Kwangsu Choi, Jeong Min Kim, Joon Sik Park, Young-won Kim
최광수, 김정민, 박준식, 김영원
Korean J. Met. Mater. 2018;56(5):335-341.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.335

The beta gamma alloys of Ti - 43.8Al - 4Nb - 2Cr - 0.2B - 0.2C at % (9CN) were prepared using induction skull melted (ISM) cast ingots. In order to make a fine fully lamellar structure with some minor phases, two step cooling was performed using two furnaces after..... More

         Cited By 1
Effect of Carbon Addition and Recrystallization on the Microstructure and Mechanical Properties of CoCrFeMnNi High Entropy Alloys
CoCrFeMnNi 고엔트로피 합금에서 탄소 첨가 및 재결정열처리가 미세구조 및 기계적 특성에 미치는 영향
Jun Yeong Ko, Jae Sook Song, Sun Ig Hong
고준영, 송재숙, 홍순익
Korean J. Met. Mater. 2018;56(1):26-33.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.26

The effect of carbon addition on the cast and rolled microstructures of CoCrFeMnNi high entropy alloys were studied. Both as-cast CoCrFeMnNi and CoCrFeMnNiC0.1 alloys have a dendritic microstructure. Small carbide particles were observed at the inter-dendritic region in the as-cast CoCrFeMnNiC0.1 and elongated-grained structure with aligned carbides were developed at..... More

         Cited By 2
Evaluation of the Protective Ability of Air-formed Oxide and Passive Films Formed on Nb-Bearing High Interstitial Stainless Steels
Nb 활용 탄질소 스테인리스강의 부동태 및 대기산화 피막 보호성 연구
Chang-Geun Lee, Heon-Young Ha, Tae-Ho Lee, Kyung-Mox Cho
이창근, 하헌영, 이태호, 조경목
Korean J. Met. Mater. 2017;55(12):870-879.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.870

The effects of Nb on grain refinement and the pitting corrosion resistance of Febalance18Cr10 Mn0.3C0.3NxNb (x = 0.1 and 0.2 wt%) high interstitial alloys were investigated through microstructure analysis and potentiodynamic polarization tests. The resistance to pitting corrosion of the two alloys, covered with a passive film and an air-formed..... More

Characteristics of NiOYSZ Gas Sensor Employing YSZ Solid Electrolyte Prepared by Thermal Spray Coating Method
용사코팅 YSZ 고체 전해질이 응용된 NiO・YSZ 가스센서의 특성
Il-Hwan Bang, Sung-Yong Cho
방일환, 조성용
Korean J. Met. Mater. 2017;55(11):819-824.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.819

A mixed potential-type NiO・YSZ (yttria stabilized zirconia) gas sensor employing 8YSZ solid electrolyte film was fabricated using a thermal spray coating method, and tested in a NO2 atmosphere at various operating temperatures. The thermal spray coating method is useful for mass producing solid electrolytes without a forming, sintering or bonding..... More

Synthesis and Thermoelectric Properties of (La1zNdz)0.8Fe4xCoxSb12 Skutterudites
Ye-Eun Cha and Il-Ho Kim

Received 2019 Apr 4     Accepted 2019 Apr 24     Published online 2019 May 16
p-Type (La1−zNdz)0.8Fe4−xCoxSb12 skutterudites were prepared by partial double filling with La/Nd and charge compensation by substituting Co for Fe. The skutterudite phase was successfully synthesized using encapsulated melting, quenching, annealing and hot-pressing processes, but a small amount of the marcasite phase was identified. Partial filling within the filling fraction limit... More
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