挤压力对挤压铸造Al-Cu合金组织与性能的影响  

Effect of Pressure on Microstructure and Properties of Squeeze Casting Al-Cu Alloy

作　　者：李彦霞[1] 张卫文[1] 赵海东[1] 倪东惠[1] 张兴华[1] 

机构地区：[1]广东白云学院,广东广州510450

出　　处：《铸造技术》2013年第5期541-543,共3页Foundry Technology

摘　　要：研究了0～175 MPa压力下挤压力对挤压铸造Al-Cu合金组织与性能的影响。结果表明:该合金的抗拉强度、伸长率、硬度和密度均随压力增加而增大;挤压力达到100 MPa时,抗拉强度为262.8 MPa、伸长率为9.2%,均达到峰值;之后继续增加压力,对材料性能影响不大。随挤压力增加,晶粒明显细化,二次枝晶增加,枝晶间距减小。The microstructure and mechanical property of as-cast A1-Cu alloy solidified at 0-175 MPa pressures were studied to determine the effect of squeezing pressure on the castings. The results show that the ultimate tensile strength, elongation, hardness and density of the as-cast castings increases with the increase of applied pressure and they reach a maximum at the pressure of 100 MPa, ultimate tensile strength 262.8 MPa and elongation 9.2%. Then continues to increase pressure, the material properties have little change. The grain size and the dendrite arm space decrease and more dendrites appear with the increase of applied pressure.

关 键 词：挤压铸造 铝铜合金 力学性能 显微组织 

分 类 号：TG249.2[金属学及工艺—铸造]