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在不同凝固速率条件下制备了原位内生Mg_2Si和Si颗粒增强的Mg_2Si/Al复合材料,研究了凝固速率对其组织和力学性能的影响。结果表明,随着凝固速率增加,初生Mg_2Si和初生Si的颗粒数量增加,多边形初生Mg_2Si趋向转变为四边形形貌,初生Si形貌则无明显变化。随着凝固速率的加快,前者的平均尺寸由30μm变为6μm,后者的平均尺寸由71μm变为21μm。性能测试显示,Mg_2Si/Al复合材料的硬度,抗拉强度和伸长率也都随着凝固速率的提高而有所增长。最佳凝固速率为460℃/s,此时复合材料的硬度、抗拉强度和伸长率分别为169 HV0.2、221 MPa和1.63%。
In-situ Mg_2Si / Al composites reinforced by in-situ Mg_2Si and Si particles were prepared under different solidification rates. The effects of solidification rate on the microstructure and mechanical properties were investigated. The results show that as the solidification rate increases, the amount of primary Mg 2 Si and primary Si particles increases, the polygons primary Mg 2 Si tends to transform into a tetragonal morphology, while the primary Si morphology does not change significantly. As the solidification rate increased, the average size of the former changed from 30μm to 6μm, while that of the latter changed from 71μm to 21μm. Performance tests show that the hardness, tensile strength and elongation of Mg 2 Si / Al composites also increase with the increase of the solidification rate. The optimum solidification rate is 460 ℃ / s, and the hardness, tensile strength and elongation of the composites are 169 HV0.2, 221 MPa and 1.63% respectively.