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| Semi–solid thixo-extrusion of AlSi7MgBe alloy |
| ZHAO Dazhi1; LU Guimin2; CUI Jianzhong1 |
1.Key Lab of Electromagnetic Processing of Materials; Ministry of Education; Northeastern University; Shenyang 110004
2.School of Resources and Environmental Engineering; East China University of Science and Technology; Shanghai 200237 |
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Cite this article:
ZHAO Dazhi LU Guimin CUI Jianzhong. Semi–solid thixo-extrusion of AlSi7MgBe alloy. Chin J Mater Res, 2009, 23(2): 127-132.
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Abstract The semi–solid thixo–extruding feasibility of AlSi7MgBe alloy cast by near–liquidus semi–continuous casting (NLSC) process was studied by analyzing the microstructures and properties of extruded bars. The results shown that the microstructure of AlSi7MgBe alloy billets cast by NLSC consists mainly of the homogeneous, fine rosette–shaped grains. The microstructures of the billets, reheated and held at 575oC, are stable and near–spherical grains which are suitable for semi–solid thixoforming. The semi–solid thixoextruded bars of the AlSi7MgBe alloy billet are facial–smoothed, microstructure–fined and homogeneous. Treated by the solution at 540oC for 5 hours and aging at 175oC for 10 hours, the tensile strength of the semi–solid extruded bars is above 325 MPa and the elongation rate is above 14.6%.
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Received: 03 June 2008
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| Fund: Supported by National Natural Science Foundation of China No.50874049. |
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