对采用近液相线半连续铸造技术制备的AlSi7MgBe合金坯料进行半固态挤压成形, 通过组织与性能的分析, 研究了AlSi7MgBe合金的半固态挤压成形性. 结果表明: 用近液相线半连续铸造技术制备的AlSi7MgBe合金坯料具有均匀、细小的蔷薇状组织, 在575℃对其二次加热可获得稳定的、适合于半固态触变成形的球化组织, 进行半固态挤压成形可获得表面光洁, 组织细小、分布均匀的成形件, 在540℃固溶5 h然后175℃时效10 h处理, 其抗拉强度为325 MPa, 伸长率为14.6%, 表明具有良好的半固态挤压成形性.
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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