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研究了ZA2 7合金在应力诱发熔体激活法 (SIMA)处理过程中形变量和等温温度对组织的影响。结果表明 :在 2 50℃预变形时 ,随着形变量的增加 ,ZA2 7合金的原始组织由发达的树枝状晶逐渐演变为粗化的等轴晶和短树枝状晶 ;在等温处理中 ,形变量越大和等温温度越高 ,初生α相逐渐形成球状颗粒 ;低温下 ,ZA2 7合金组织粒状化的原因是回复与再结晶的多边形晶界处形成低熔点Zn Al Cu三元共晶组织 ,较高温度则形成Zn Al二元共晶。
The effect of deformation amount and isothermal temperature on microstructure of ZA2 7 alloy during SIMA treatment was investigated. The results show that the initial microstructure of ZA2 7 alloy evolves from developed dendrites to coarser equiaxed and short dendrites at pre-deformation of 250 ℃. With the increase of deformation, The larger deformation and higher isothermal temperature, the primary α phase gradually formed spherical particles; low temperature, the reason for the granularity of the ZA2 7 alloy was the formation of low-melting Zn Al Cu ternary eutectic at the grain boundaries of the recrystallized and recrystallized polygons, At higher temperatures Zn Zn binary eutectic is formed.