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| Microstructure and Mechanical Properties of Two–phase Mg–10.73Li–4.49Al–0.52Y Alloy Processed by ECAP at Different Routes |
| KANG Zhixin, KONG Jing, HOU Wenting, LI Yongxin |
| School of Mechanical & Automotive Engineering, South China University of Technology, National Engineering Research Center of Near–Net–Shape Forming for Metallic Materials, Guangzhou 510640 |
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Cite this article:
KANG Zhixin KONG Jing HOU Wenting LI Yongxin. Microstructure and Mechanical Properties of Two–phase Mg–10.73Li–4.49Al–0.52Y Alloy Processed by ECAP at Different Routes. Chin J Mater Res, 2011, 25(5): 500-508.
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Abstract The extrusion deformation at 573 K was performed on two–phase Mg–10.73Li–4.49Al–0.52Y magnesium–lithium alloy processed by equal channel angular pressing (ECAP) from 1 pass to 4 passes through routes Bc, A and C. The pressed microstructures were investigated by using OM, SEM and XRD. The results show that the grains of both α and β phases are significantly elongated and refined after ECAP deformation with different routes. After 4 passes, flaky grains were obtained for route A, equiaxed grains were gained for route C, and structures alternated with equiaxed and lath–like features were observed for route Bc. The mechanical tensile test at room temperature indicates that route Bc gets good integrated mechanical properties, whose elongation is up to 70%. The texture of {110} crystal plane for β phase reveals that different changes exist among three pressing routes with ECAP passes, but textures of all three routes become softening, therefore the tensile strength decreases correspondingly as the texture softening is more effective than grain refining.
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Received: 23 June 2011
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| Fund: Supported by Guangzhou Science and Technology Development Program No.2009Z2–D811. |
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