Effect of rare earths on phase transformation in as-cast ZA27 alloy dur-ing compressive creep
来源期刊：Rare Metals2003年第4期
论文作者：WEI Xiaowei and SHEN Baoluo) Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu , China) Department of Materials Science and Engineering, Sichuan Institute of Technology, Chengdu , China) Department of Metal Science, Sichuan University, Chengdu , China
文章页码：259 - 264
摘 要：<正> The effect of the mixed rare earths of Ce on the phase transformation in as cast ZA27 alloy during compressive creep was investigated under 37 MPa and at 160℃ by X-ray diffraction technique and SEM. The results showed that the as cast microstructure of ZA27-RE alloy consisted of a dendritic Al-rich a’ surrounded by Zn-rich β’ phase, interdendritic ε phase and Zn-rich η phase together with a complex Z phase which was a complex constitute compound, （RE,Cu）Al5Zn16, dispersed in crystal interfaces or branch crystal interfaces and stable during compressive creep test at 160’C. The phase transformations of ZA27-RE alloy, decomposition of β’ phase and four transformation, were delayed by the addition of rare earths, also the lamellar structure and the spheroidized structure in ZA27-RE alloy were finer than in ZA27 alloy during compressive creep test at 160℃ at the same creep time, and the compressive creep resistance of ZA27-RE alloy was higher than that of ZA27 alloy.
WEI Xiaowei and SHEN Baoluo1) Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610045, China2) Department of Materials Science and Engineering, Sichuan Institute of Technology, Chengdu 610039, China3) Department of Metal Science, Sichuan University, Chengdu 610065, China
摘 要：<正> The effect of the mixed rare earths of Ce on the phase transformation in as cast ZA27 alloy during compressive creep was investigated under 37 MPa and at 160℃ by X-ray diffraction technique and SEM. The results showed that the as cast microstructure of ZA27-RE alloy consisted of a dendritic Al-rich a’ surrounded by Zn-rich β’ phase, interdendritic ε phase and Zn-rich η phase together with a complex Z phase which was a complex constitute compound, （RE,Cu）Al5Zn16, dispersed in crystal interfaces or branch crystal interfaces and stable during compressive creep test at 160’C. The phase transformations of ZA27-RE alloy, decomposition of β’ phase and four transformation, were delayed by the addition of rare earths, also the lamellar structure and the spheroidized structure in ZA27-RE alloy were finer than in ZA27 alloy during compressive creep test at 160℃ at the same creep time, and the compressive creep resistance of ZA27-RE alloy was higher than that of ZA27 alloy.
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