Al-Ti-Cr 합금계 L1₂기지 합금의 800℃에서의 상안정성Phase Stability of L12-based alloys at 800oC in Al-Ti-Cr System

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Relationship between the phase stability and the composition of L1_2-based Ti-Al-Cr alloys at 800℃ was investigated. It was found that the yield strength of Al-21Ti-23Cr and Al-21Ti-15Cr alloys with Ti-lean composition after exposure at 800℃showed a relatively small increase compared with that of alloys homogenized at 1150℃. However, yield strength of al-30Ti-15Cr alloy with Ti-rich composition after exposure at 800℃ increased very remarkably. The difference in strength increment after exposure at 800℃ was due to the partial decomposition of L1_2 phase in Al-21Ti-23Cr and Al-21Ti-15Cr alloys, and the complete decomposition of L1_2 phase in al-30Ti-15Cr alloy. Therefore, alloys with Ti-lean composition were expected more suitable for light heat resistant and oxidation resistant coating material with respect to stability of L1_2 phase. It was also revealed that the phase decomposition of L1_2 phase resulted from the shift of L1_2 phase region to Al-rich corner in Al-Ti-Cr phase diagram with decreasing temperature.
Publisher
대한금속·재료학회
Issue Date
2003-01
Language
Korean
Citation

대한금속·재료학회지, v.41, no.1, pp.1 - 7

ISSN
1738-8228
URI
http://hdl.handle.net/10203/84771
Appears in Collection
MS-Journal Papers(저널논문)
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