固溶处理对AZ81-xSr合金组织及力学性能的影响

Effects of Solid-Solution Treatment on Microstructure and Mechanical Properties of AZ81-xSr Alloy

研究了固溶处理对AZ81-xSr(x=0.9、1.8、2.7)镁合金铸态组织及力学性能的影响。结果表明,该合金被固溶处理后,合金组织中的β-Mg17Al12相几乎全部溶于α-Mg基体中,而Sr5Al9相未见溶解。固溶处理使热稳定的Sr5Al9相由骨骼状向层片状和颗粒状转变。并且,固溶处理后,该合金的高温力学性能和硬度得到明显提高。

Effects of solid-solution treatment on microstructure and mechanical properties of AZ81-xSr magnesium alloy were investigated.The results indicate that theβ-Mg17Al12 phase of AZ81-xSr alloy is almost totally dissolved into matrix after solid-solution treatment,however,Sr5Al9 phase is not dissolved into matrix.After solid-solution treatment,the form of new skeleton-like Sr5Al9 phase is changed to be lamellar and particular structure.Moreover,mechanical properties and hardness of the alloy are also obviously improved after the solid-solution treatment.