均匀化处理对Al-4.5Mg-3Si合金组织与性能的影响

Effect of homogenization treatment on microstructure and properties of Al-4.5Mg-3Si alloy

采用扫描电镜、显微硬度计、电导率测量仪、X射线衍射仪,研究了均匀化温度和时间对Al-4.5Mg-3Si合金组织和性能的影响。结果表明,均匀化处理可有效提高Al-4.5Mg-3Si合金的均匀化程度,明显改善该合金的显微硬度及电导率。经560℃×4 h条件下均匀化处理的Al-4.5Mg-3Si合金组织中的树枝晶完全被打断,枝晶偏析现象完全消除。对比未均匀化处理Al-4.5Mg-3Si合金,其显微硬度由78.15 HV0.1增加到81.71 HV0.1,增加了约4.76%,电导率由36.5%IACS增加到38.9%IACS,增加了约6.6%,确定Al-4.5Mg-3Si合金较为优化的均匀化处理工艺参数为560℃×4 h。

Effects of homogenization treatment temperature and time on microstructure and property of Al-4. 5 Mg-3 Si alloy were researched by means of SEM,microhardness tester,conductivity meter and XRD. The results show that the unifromity of Al-4. 5 Mg-3 Si alloy can be improved efficiently,and its＇ microhardness and conductivity can be improved after homogenization treatment. The dendrite of Al-4. 5 Mg-3 Si alloy is broken completely,and the dendrite microsegregation is also completely eliminated after the homogenization treatment of 560 ℃ × 4 h.Compared with no homogenization of Al-4. 5 Mg-3 Si alloy,the microhardness increases from 78. 15 HV0. 1 to 81. 71 HV0. 1,by 4. 76%,and the conductivity increases from 36. 5% IACS to 38. 9% IACS,by 6. 6%. So,the optimal technical parameter of homogenization treatment of560 ℃ × 4 h is determined.