微量Ce对Al-Cu-Mn铸造合金组织和性能的影响

Effect of Trace Ce on Microstructure and Properties of Al-Cu-Mn Casting Alloy

利用金相显微镜和拉伸实验机,研究了不同含量的微量稀土元素Ce对铸造Al-Cu-Mn合金显微组织和力学性能的影响。结果表明:随稀土元素Ce含量的增加,合金中枝状晶呈先变小后变大;热处理后合金的抗拉强度和伸长率先增加后减小。当稀土元素Ce含量为0.1%时,合金的抗拉强度和伸长率达到最大值,分别为425 MPa和.18%。

The influences of different content of Ce on the microstructure and mechanical properties of Al-Cu-Mn casting alloy were studied by metallographic microscope and tensile tester.The results show that with the increase of Ce content,the dendrites in the alloy decrease first and then increase,and after heat treatment,the tensile strength and elongation of the alloy increase first and then decrease.When the content of rare earth element Ce is 0.1%,the tensile strength and elongation of the alloy reach the maximum,which is 425 MPa and 3.18%,respectively.