ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 18    No. 3    June 2008

[PDF]    
Microstructure characteristics and mechanical properties of rheoformed wrought aluminum alloy 2024
GUO Hong-min(郭洪民)1, YANG Xiang-jie(杨湘杰)2, ZHANG Meng(张 萌)1
(1. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;2. School of Mechanical and Electronic Engineering, Nanchang University, Nanchang 330031, China)
Abstract: The microstructure characteristics and mechanical properties of 2024 wrought aluminum alloy produced by a new rheoforming technique under as-cast and optimized heat treatment conditions were investigated. The present rheoforming combined the independently developed rheocasting process, named as LSPSF (low superheat pouring with a shear field) process, and the existing squeeze casting process. The experimental results show that LSPSF can be used to prepare sound semi-solid slurry within 25 s to fully meet the production rate of squeeze casting. The primary α(Al) presents in mean equivalent diameter of 69 μm and shape factor of 0.76, and features zero-entrapped eutectics. Compared with conventional squeeze casting, the present LSPSF rheoforming can improve the microstructures and mechanical properties. An optimized heat treatment results in substantial reduction of microsegregation and significant improvement of mechanical properties, such as yield strength of 321 MPa, ultimate tensile strength of 428 MPa and elongation of 12%.
Key words: semi-solid; rheoforming; wrought aluminum alloy; microstructure; mechanical properties
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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