浇注温度对Mg2Si增强过共晶Al-Si合金组织与性能的影响  

Effects of Pouring Temperature on Mg2Si Particle Reinforced Hypereutectic A-Si Alloy In-situ Composites

作　　者：刘萍[1] 

机构地区：[1]上海交通大学

出　　处：《特种铸造及有色合金》2006年第5期272-275,共4页Special Casting & Nonferrous Alloys

摘　　要：采用液态熔融法制备Mg2Si增强过共晶AlSi合金自生复合材料,研究了浇注温度、稀土(Pr)变质处理对铸造显微组织与性能的影响。结果表明,在液相线附近,浇注温度为720℃时,晶粒均匀细小;Pr变质剂对初生硅及共晶组织均有明显的细化效果,并细化Mg2Si、改变其形貌与尺寸,可显著提高合金的力学性能。Effects of pouring temperature, rare earth (Pr) modification on the microstructure and properties of as-cast Mg2Si particle reinforced hypereutectic Al-Si alloy in-situ composites prepared by liquid-melting casting were examined. The results show that the composites with uniform and fine grain size can be prepared by pouring at 720 ℃ nearby liquidus temperature. RE modifier can effectively refine the primary Si phase and eutectic structure while refine size and change morphology of the Mg2Si particle, obviously improving the mechanical properties of the alloy and postponing the modification time.

关 键 词：MG2SI 过共晶AL-SI合金 自生复合材料 显微组织 

分 类 号：TG113[金属学及工艺—物理冶金]