最终形变热处理工艺对Al-5.2Mg-3.1Zn铝合金组织性能的影响

Effect of Final Thermo-Mechanical Treatment on the Microstructure and Property of Al-5.2Mg-3.1Zn Aluminum Alloy

深入研究了最终形变热处理工艺对Al-5.2Mg-3.1Zn铝合金组织性能的影响。通过维氏硬度测试研究了变形工艺对最终形变热处理最终时效工艺的影响。通过金相观察和透射电镜观察发现经过最终形变热处理的板材内部存留大量的位错结构和纤维状组织,且其含量取决于板材的变形工艺。通过板材的力学性能和晶间腐蚀性能研究发现变形温度的提高会降低板材的强度,但会提高板材的延伸率;而变形量的作用则恰恰与之相反;提高变形温度和变形量都有利于提高板材的抗晶间腐蚀性能。

The effect of final thermo-mechanical treatment on the microstructure and property of Al-5.2 Mg-3.1 Zn(mass fraction,%) aluminum alloy was studied. The effect of deformation parameter on the final aging treatment was studied by Vickers hardness tests. Observations under optical microscopy and transmission electron microscopy show that there are lots of dislocation structure and fibrous structure in the microstructure, and their volume fractions depend on the deformation parameter. The tensile test reveals that the increase of deformation temperature increases the strength of sheets, but decreases the elongation. However, the amount of deformation has the completely opposite effect on the tensile property. The increase of deformation temperature and deformation amount both increase the intergranular corrosion resistance of sheets.