低温均匀化对6082铝合金组织及性能的影响

Effect of Low Temperature Homogenization on the Microstructure and Properties of 6082 Aluminum Alloy

通过OM、SEM、EDS、拉伸测试、硬度检测等方法,研究了低温均匀化热处理工艺对特定成分的6082铝合金铸锭组织及性能的影响。结果表明:当均匀化温度从350℃升高至450℃时,随着温度的升高晶界上的第二相(α-Al(FeMnCr)Si)分解越充分,晶内析出相(Mg2Si)析出越均匀;温度升高对应的力学性能也相应提升,其中抗拉强度及硬度在450℃/10 h时达到最大值为162.5 MPa和53.3HV,导电率在450℃/15 h时达到最大为48.63%IACS;相同均匀化温度下保温10和15 h,对6082铝合金的组织和力学性能影响不大。

In this paper,the effects of low temperature homogenization heat treatment process on the microstructure and properties of 6082 aluminum alloy ingots with specific composition were studied by OM,SEM,EDS,tensile testing and hardness testing.The results show that the homogenization temperature increases from 350℃to 450℃,as the temperature increases,the decomposition of the second phase(α-Al(FeMnCr)Si)on the grain boundary is more sufficient,and the precipitation of the intragranular phase(Mg2Si)is more uniform.The mechanical properties corresponding to the increase in temperature also increase accordingly.Among them,the tensile strength and hardness reach a maximum of 162.5 MPa and 53.3 HV at 450°C/10 h,and the electrical conductivity reaches a maximum of 48.63%IACS at 450°C/15 h.Holding the alloy for 10 h and 15 h at the same homogenization temperature has little effect on the microstructure and mechanical properties of the alloy.