Microstructure and Tensile Properties of a Cast Eutectic Al?Si?Cu Alloy Modified by Zr and V

Jianbo Sun; Guangkai Zeng; Dewang Rao; Yuchen Wang; Yiwang Yang; Liwen Pan; Zhiliu Hu

doi:10.1007/s12540-020-00909-0

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자료유형: 학술저널

저자정보: Jianbo Sun (Guangxi University) Guangkai Zeng (Guangxi University) Dewang Rao (Guangxi University) Yuchen Wang (Guangxi University) Yiwang Yang (Guangxi University) Liwen Pan (Guangxi University) Zhiliu Hu (Guangxi University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12

발행연도: 2021.12

수록면: 5,436 - 5,449 (14page)

DOI: 10.1007/s12540-020-00909-0

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Minor Zr and V were added individually and jointly to Al?12.5Si?1Cu alloy to develop heat-resistant aluminum alloys. Theas-cast microstructure, room temperature, and high temperature (350 °C) tensile properties and the strengthening mechanismof the modified alloys were investigated. The results show that the rod-like (Al, Si)3Zr and hexagonal (Si, Al)2V precipitatesare respectively found in the alloys with individually added Zr or V. At the same time, they were transformed into (Al,Si)3(Zr, V) and (Si, Al)2(V, Zr) when Zr and V were added together. Individually added Zr or V could change the eutecticsilicon aspect ratio, but the largest effect was recorded for the combined addition 0.3 wt% Zr + 0.4 wt% V. The addition ofZr and V had no significant impact on the room temperature tensile strength of the alloys but improved the yield strength. Individual additions of Zr and V caused negligible improvements in high-temperature tensile strength of alloys tested. Incontrast, the combined Zr + V additions resulted in the substantial improvement with tensile strength at 350 °C reaching79.4 MPa, i.e. 89% higher than the base alloy. The analysis shows that the increase of eutectic silicon aspect ratio and thesolution strengthening of trace V in eutectic silicon is the leading cause of improving high-temperature tensile strength. Thebrittle, blocky primary silicon, coarse rod-like (Al, Si)3(Zr, V), and hexagonal (Si, Al)2(V, Zr) precipitates are detrimentalto high-temperature properties.

#Al?Si?Cu alloy #Zr and V modification #Microstructure #Tensile property #Failure mechanism

참고문헌 (52)

참고문헌 신청

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