Effects of high-pressure rheo-squeeze casting on the Fe-rich phases and mechanical properties of Al-17Si-(1,1.5)Fe alloys

被引：6
|
作者：
Lin, Chong [1 ,2 ]
Wu, Shu-sen [1 ]
Lu, Shu-lin [1 ]
An, Ping [1 ]
Wu, He-bao [2 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Mould Technol, Wuhan 430074, Hubei, Peoples R China
[2] Wuhan Inst Technol, Hubei Prov Key Lab Chem Equipment Intensificat &, Wuhan 430205, Hubei, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2018年 / 25卷 / 09期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
high pressure; rheo-squeeze casting; Al-17Si-(1; 1; 5)Fe alloys; Fe-rich phases; mechanical properties; CONTAINING INTERMETALLIC COMPOUNDS; AL-SI ALLOYS; MICROSTRUCTURES; ADDITIONS; EVOLUTION;
D O I：
10.1007/s12613-018-1652-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of high pressure rheo-squeeze casting (HPRC) on the Fe-rich phases (FRPs) and mechanical properties of Al-17Si-(1,1.5)Fe alloys were investigated. The alloy melts were first treated by ultrasonic vibration (UV) and then formed by high-pressure squeeze casting (HPSC). The FRPs in the as-cast HPSC Al-17Si-1Fe alloys only contained a long, needle-shaped -Al5FeSi phase at 0 MPa. In addition to the -Al5FeSi phase, the HPSC Al-17Si-1.5Fe alloy also contained the plate-shaped -Al4FeSi2 phase. A fine, block-shaped -Al4FeSi2 phase was formed in the Al-17Si-1Fe alloy treated by UV. The size of FRPs decreased with increasing pressure. After UV treatment, solidification under pressure led to further refinement of the FRPs. Considering alloy samples of the same composition, the ultimate tensile strength (UTS) of the HPRC samples was higher than that of the HPSC samples, and the UTS increased with increasing pressure. The UTS of the Al-17Si-1Fe alloy formed by HPSC exceeded that of the Al-17Si-1.5Fe alloy formed in the same manner under the same pressure. Conversely, the UTS of the Al-17Si-1Fe alloy formed by HPRC decreased to a value lower than that of the Al-17Si-1.5Fe alloy formed in the same manner.
引用
收藏
页码：1018 / 1026
页数：9
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