热型连铸锌铝合金定向凝固线材的组织分析

Microstructure analysis of ZA alloy rod directionally solidified by heated mold continuous casting

对热型连铸锌铝合金定向凝固线材的铸态及热处理组织进行了观察、分析和讨论。结果表明 :热型连铸锌铝合金线材的显微组织为定向生长的平行柱状枝晶组织 ;共晶合金ZA5的枝状共晶的每个枝晶都由多层片状共晶 β和 η两相构成 ,过共晶合金的组织为初生树枝晶和枝晶间共晶组织 ,其中ZA8,ZA12初生相为 β相 ,ZA2 2和ZA2 7的初生相是α相。

The as cast and heat treatment microstructure of ZA alloy rod directionally solidified by continuous casting has been analyzed. The results show that the microstructure of the ZA alloy lines is the parallel directional dendritic columnar crystal. Every dendritic crystal of eutectic alloy ZA5 is composed of many layer eutectic β and η phases. The microstructure of hyper eutectic ZA alloys is primary dendritic crystal and interdendritic eutectic structure. The primary phase of ZA8 and ZA12 is β phase, but the primary phase of ZA22 and ZA27 is α phase. [