(1. 甘肃工业大学 材料科学与工程学院,兰州 730050;
2. 华中科技大学 材料科学与工程学院, 武汉 430074)
摘 要: 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,ZA22和ZA27的初生相是α相。
关键字: 连续铸造; 定向凝固; 锌铝合金; 加热铸型
solidified by heated mold continuous casting
(1. School of Materials Science and Technology,
Gansu University of Technology, Lanzhou 730050, P.R.China;
2. School of Materials Science and Technology,
Huazhong University of Scienceand Technology, Wuhan 430074, P.R.China)
Abstract: 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. Themicrostructure 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.
Key words: continuous casting; directional solidification; zinc-aluminum alloy; heated mold