采用立式离心铸造的方法,制备了铝铜合金铸件。通过光学显微镜、显微硬度计和室温拉伸、压缩性能测试,研究了人工时效处理对铝铜合金铸件显微组织和力学性能的影响规律。结果表明：随着时效温度的升高和时效时间的延长,合金试样的抗拉强度、抗拉屈服强度、抗压强度、压缩屈服强度以及显微硬度先升高后降低,在160℃时效5 h时达到最大值,此时的抗压强度达到241 MPa,显微硬度为108 HV,铸件的伸长率却发生相反的变化;力学性能呈现上述规律是由于显微组织发生相应变化引起的。
Al-Cu alloy castings were prepared by vertical centrifugal casting.The effect of artificial ageing treatment on microstructure and mechanical properties of Al-Cu alloy castings was studied by means of OM,microhardness test and room temperature tension and compression tests.The results show that tensile strength,tensile yield strength,compressive yield strength and microhardness of the alloy increase firstly and then decrease with increasing of aging temperature and aging time,tensile strength of the alloy reach the maximum values at 160 ℃for 5 h,and the compressive yield strength reaches to 241 MPa,microhardness reaches to 108 HV,however,a opposite variance of elongation is observed.The changes of mechanical properties of the alloy are due to evolution of its microstructure during aging treatment.
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