Effects of Cr and Al additions on the $\gamma/\gamma'$ forming Co-Ti-W-based alloys = $\gamma/\gamma$' 구조를 형성하는 Co-Ti-W 기반 합금의 Cr 및 Al 첨가 효과

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The effects of Cr and Al on the Co-Ti-W alloys with respect to atomic partitioning tendency and high-temperature properties of Co-Ti-W-based alloys containing $\gamma$/$\gamma$' phases were observed. Cr additions to a Co-Ti-W base alloy caused a decrease in $\gamma$' volume fraction, while additions of Al caused substantially increases of $\gamma$' volume fractions. These alloy designs resulted in decreased lattice misfits of $\gamma$/$\gamma$' phases. Ti and W partitioned to the $\gamma$' phase, while Co, Cr, and Al partitioned to $\gamma$ confirmed by APT. Thermal property, mechanical property, and oxidation resistance of the alloys were also measured. The thermal stability of the $\gamma$' phase increased with the addition of Cr and Al and the yield stress changed greatly at high temperatures. However, the added amount of Cr and Al was small and the increased resistance to oxidation was not identified.
Advisors
Choi, Pyuck-Paresearcher최벽파researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2019.2,[iv, 42 p. :]

Keywords

Cobalt▼asuperalloy▼aAtom probe tomography (APT)▼amicrostructure▼ayield stress anomaly▼aoxidation resistance; 코발트▼a초합금▼a원자 탐침 단층 촬영▼a미세구조▼a항복 응력 이상▼a내산화성

URI
http://hdl.handle.net/10203/266523
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=843307&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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