均匀化处理对6082铝合金冲击性能影响的研究

Effect of Homogenization on Impact Property of 6082 Aluminum Alloy

采用光学显微镜、SEM和冲击试验机研究了均匀化处理后的6082铝合金的组织与冲击性能。结果表明,6082铝合金铸锭组织晶粒比较细小,晶界存在大量网状非平衡析出相。均匀化处理后,析出相的数量大幅减少、晶粒尺寸增大、偏析消除、非平衡相溶解、晶界上的网状化合物部分被溶解。铸态组织中析出的Al(MnFe)Si相具有较好的热稳定性。随着均匀化过程的进行,析出相逐渐球化,铸态网状析出相的溶解提高了试样的抗冲击性能。均匀化热处理后合金的综合性能得到了改善,有利于在恶劣的服役环境下使用。

The microstructure and impact properties of 6082 aluminum alloy by homogenization treated were studied by optical microscope,SEM and impact testing machine.The results show that the grain structure of 6082 aluminum alloy ingots is relatively small,and there are a lot of non-equilibrium precipitates in grain boundary.After homogenization process,the number of precipitated phases is greatly reduced,the grain size increase,segregation is eliminated,non-equilibrium phase dissolve,and the reticular compound on the grain boundary is partially dissolved.The precipitated Al(MnFe)Si phase in the as-cast structure has good thermal stability.The precipitated phase gradually spheroidized with the homogenization process,and the dissolution of the cast mesh precipitated phase improved the impact resistance of the sample.After homogenized heat treatment,the comprehensive properties of the alloy have been improved,which is beneficial to use in harsh service environment.