Microstructure control in two-phase Al-21Ti-23Cr alloy

To improve the mechanical properties of the Al-21Ti-23Cr two-phase alloy consisting of L1(2) matrix and 20 vol% Cr2Al as a second phase, microstructure control was conducted through the aging treatment as a thermal process and the addition of V and Zr as conventional alloying. It was found that TiAlCr was precipitated as a third phase in the L1(2) matrix by the aging treatment at 800 and 1000 degrees C, and its size was smaller at 800 degrees C than at 1000 degrees C. The yield strength of the aged alloy increased rapidly only at 800 degrees C although the third phase was precipitated at both 800 and 1000 degrees C. In the V-added two-phase alloys, the yield strength and the strain increased simultaneously when V was added up to 3 at%, which is attributable to the improvement in the ductility of Cr2Al. Microstructure control conducted in this study suggests the possibility of improving the mechanical properties of Lit (Al,Cr)(3)Ti-based two-phase alloy by precipitating the fine third phase in the Lit matrix and enhancing the ductility of the second phase. (C) 2000 Elsevier Science Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2000-04
Language
ENG
Keywords

2-PHASE INTERMETALLIC COMPOUNDS; ZIRCONIUM TRIALUMINIDES; MECHANICAL-PROPERTIES; L12 TRIALUMINIDES; CR; BEHAVIOR; DEFORMATION; FRACTURE; CLEAVAGE; STRENGTH

Citation

INTERMETALLICS, v.8, no.4, pp.407 - 416

ISSN
0966-9795
URI
http://hdl.handle.net/10203/1787
Appears in Collection
MS-Journal Papers(저널논문)
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