工艺参数对AE44镁合金外壳压铸件组织和性能的影响  

Effect of Process Parameters on Microstructure and Properties of Die-cast AE44 Magnesium Alloy Shell

作　　者：李明 LI Ming(Anhui Jianghuai Automobile Group Corp.,Ltd.,Hefei 230022,Anhui China)

机构地区：[1]安徽江淮汽车集团股份有限公司,安徽合肥230022

出　　处：《铸造工程》2018年第5期13-17,共5页Foundry Engineering

摘　　要：采用正交试验研究了浇注温度、模具温度和压射速度等工艺参数对AE44镁合金外壳压铸件显微组织和力学性能的影响。结果表明：当浇注温度为680℃、模具温度为200℃及压射速度为3．5m／s时，外壳压铸件的力学性能和显微组织最佳。由物相分析得出，AE44镁合金的显微组织主要由a-Mg基体和沿晶界分布的Mg-RE化合物组成，Mg-RE化合物主要为Al2RE相和Al11RE3相。The effect of technological parameters such as pouring temperatures, mold temperatures and injection speeds on microstructure and mechanical properties of the die-cast AE44 magnesium alloy shell were investigated by using an orthogonal experiment.The results showed that the shell die-cast under condition that the pouring temperature is 680 ℃, the mold temperature is 200 ℃ and the injection speed is 3.5 m/s exhibited the best microstructure and mechanical properties. From phase analysis it was seen that microstructure of the AE44 magnesium alloy was predominantly a-Mg matrix and Mg-RE compound which lay in the grain boundaries and substantially A12RE phase and Al11RE3 phase.

关 键 词：AE44镁合金 压铸件 力学性能 显微组织 

分 类 号：TG249[金属学及工艺—铸造]