Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 25, Issue 3, Pages 395-398Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-010-0009-z
Keywords
equal channel angular pressing (ECAP); deformation and fracture; metals and alloys; ultrafine-grained structure; mechanical properties
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Funding
- Specialized Fund for the Innovation of College Student of Taiyuan City [08122067, 07010727]
- Natural Science Foundation of Shanxi Province, China [2006011051]
- Shanxi Research Fund for Returned Scholars [2007-25]
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A high-Mg2Si content Al alloy was extruded by equal channel angular pressing (ECAP) for 8 passes at 250 degrees C and an ultrafine-grained structure with an average grain size of about 1.5 mu m was achieved. The coarse skeleton-shaped Mg2Si phase presenting in the as-cast alloy are significantly fragmented into fine rod-shaped as well as equiaxed particles mostly less than about 230 nm and become relatively dispersed. The tensile strength 192.8 MPa and the elongation up to 31.3% at ambient temperature are attained in the 8-pass ECAPed alloy versus 163.3 MPa and 9.1% in the as-cast alloy. High-temperature creep test at 250 degrees C reveals that the ECAPed sample exhibits a high elongation close to 100% at a relatively high creep rate 7.64x10(-5) s(-1), compared to the elongation 56% at a low strain rate 1.74x10(-7) s(-1) in the as-cast alloy. Key words: equal channel angular pressing (ECAP); deformation and fracture; metals and alloys.
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