Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 24    No. 8    August 2014

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Microstructural evolution of gas atomized Al-Zn-Mg-Cu-Zr powders during semi-solid rolling process
Feng-xian LI1,2, Yun-zhong LIU2, Jian-hong YI1

1. College of Materials Science and Engineering, Kunming University of Science and Technology,
Kunming 650033, China;
2. College of Mechanical and Automotive Engineering, South China University of Technology,
Guangzhou 510640, China

Abstract:Under H2 atmosphere, the green strips were prepared from Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr (mass fraction, %) powders by the semi-solid rolling process with a relative density from 76.1% to 88.0%. The role of temperature on microstructure and mechanical properties was investigated. With increasing rolling temperature from 580 to 610 °C, the disappearance of primary powder boundary and isolated pores, inter-diffusion of species and the change of grain boundary were accelerated. Moreover, the mechanism of microstructure evolution changes from the densification dominant regime to the coarsening dominant regime; the amount of η (MgZn2) phase decreased and more Al2Cu particles precipitated at grain boundaries. The optimum temperature for semi-solid rolling of Al-5.8Zn-1.63Mg-2.22Cu-0.12Zr powders was determined. The liquid fraction in the range of 53% to 67% corresponds with a high density level of green strips. The present experimental analysis suggests that semi-solid powder rolling can be optimized to manufacture strips with high mechanical properties.


Key words: semi-solid rolling; aluminum alloy powder; microstructure

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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