Influence of process conditions on microstructures and mechanical properties of T5-treated 357 aluminum alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:834

Article

Yamamoto, K.^1,2  Takahashi, M.²  Kamikubo, Y.²  Sugiura, Y.²  Iwasawa, S.³  Nakata, T.¹  Kamado, S.¹ 

[1] Nagaoka Univ Technol, Nagaoka, Niigata, Japan

[2] Asanuma Giken Co Ltd, Hamamatsu, Shizuoka, Japan

[3] Ind Res Inst Shizuoka Prefecture, Shizuoka, Japan

关键词: Aluminum alloy;    Thixo-casting;    T5-treatment;    Natural aging;    Microstructure;    Mechanical properties;   

DOI  :  10.1016/j.jallcom.2020.155133

来源: Elsevier

【 摘 要 】

The effect of casting processing and natural aging on microstructures and mechanical properties of T5-treated Al-7wt.%Si-0.5 wt.%Mg-0.01 wt.%Sr (ASTM 357) alloys has been investigated. An artificial aging gives fine precipitation microstructures, and the thixo-cast processing provides much finer distributions of eutectic Si phases and Al8Si6Mg3Fe phases than the gravity-cast and die-cast processing, leading to higher level of strength-ductility balance in the thixo-cast alloys than that of T6-treated Al-Si based cast alloys. Although the prolonged natural aging significantly changes the subsequent artificial age-hardening behaviors and precipitation microstructures, it is interesting to note that the cast alloys could keep their good strengths even after the T5-treatment including the long-term natural aging. This finding will open up the development of strong and ductile cast Al-7wt.%Si-Mg based alloys which can broaden the application of aluminum alloys in automotive industry. (C) 2020 Elsevier B.V. All rights reserved.

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