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. 27    No. 11    November 2017

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Microstructure evolution and strengthening mechanisms of spray-formed 5A12 Al alloy processed by high reduction rolling
Cai-he FAN1, Xi-hong CHEN2, Xin-peng ZHOU2, Ling OU1, Jian-jun YANG1, Ying-biao PENG1

1. College of Metallurgy and Material Engineering, Hunan University of Technology, Zhuzhou 412007, China; 2. CRRC Zhuzhou Electric Locomotive Co., Ltd., Zhuzhou 412007, China

Abstract:The extrusion preform of the spray-formed 5A12 Al alloy was hot rolled using high reduction rolling technology. By means of transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS), the microstructure evolution was studied and the strengthening and toughening mechanism was thereby proposed. The results indicate that discontinuous and continuous dynamic recrystallization occurred during the hot rolling deformation of the spray-formed 5A12 Al alloy. The grain size was significantly refined and the micro-scale grains formed. Partial dynamic recrystallization leads to a significant increase of dislocation density and cellular structure. The Mg atoms were distributed in the Al matrix mainly in the presence of solid solution rather than the formation of precipitate. High solid solution of Mg atoms not only hindered the dislocation motion and increased the density of dislocation, but also exhibited a remarkable solid solution strengthening effect, which contributes to the high strength and high toughness of the as-rolled sheets. The tensile strength and elongation of spray formed 5A12 Al alloy at room temperature after 3 passes hot rolling were 622 MPa and 20%, respectively.


Key words: 5A12 Al alloy; spray forming; rolling; microstructure; strengthening mechanisms

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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