(1. 甘肅工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，蘭州 730050；
2. 華中科技大學(xué) 材料科學(xué)與工程學(xué)院, 武漢 430074)
摘 要: 對熱型連鑄鋅鋁合金定向凝固線材的鑄態(tài)及熱處理組織進行了觀察、分析和討論。結(jié)果表明：熱型連鑄鋅鋁合金線材的顯微組織為定向生長的平行柱狀枝晶組織；共晶合金ZA5的枝狀共晶的每個枝晶都由多層片狀共晶β 和η兩相構(gòu)成，過共晶合金的組織為初生樹枝晶和枝晶間共晶組織，其中ZA8，ZA12初生相為β相，ZA22和ZA27的初生相是α相。
關(guān)鍵字: 連續(xù)鑄造； 定向凝固； 鋅鋁合金； 加熱鑄型
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
