预变形及液固两相区等温处理对ZA27合金铸态组织的影响

中国有色金属学报, 2001, 11(1): 47-50.

预变形及液固两相区等温处理对ZA27合金铸态组织的影响

谢辉 ^1, , ^2, , 许丽君 ^3, , 袁中岳 ^4, , 郑红星 ^5, , 郭学锋 ^6,

1.西安理工大学材料科学与工程学院,

2.School of Materials Science and Engineering, Xi′an University of Technology,

3.西安理工大学材料科学与工程学院,

4.西安理工大学材料科学与工程学院,

5.西安理工大学材料科学与工程学院,

6.西安理工大学材料科学与工程学院,

基金项目: 陕西省自然科学基金(98C13) 陕西省教育厅资助项目

关键词：固液两相区 , 等温处理 , 预变形

Effects of pre-deforming and isothermal treatment on structural granular transformation of as-cast ZA27 alloy

研究了固液两相区等温处理对铸态ZA27合金初生相形貌的影响。结果表明：在固液两相区进行等温处理时，枝晶熔断受固液界面处原子的扩散控制，提高等温温度、延长等温时间因有利于Zn和Al原子的扩散而促进初生相由枝晶向颗粒状晶演变；预变形促进初生相形貌演变的根本原因在于等温处理时液相沿预变形产生的亚晶界的熔渗。

The effects on transformation of primary phase morphology were studied by using isothermal heat treatment of the as-cast ZA27 ingots in semi-solid s ta te. The results show that remelting of dendrite is controlled by atom diffusio n in the solid-liquid interface. Increasing isothermal temperature and prolonging isothe r mal time， which promoted the diffusion of Zn and Al atoms， are helpful to th e tr ansformation. Liquefaction along hypo-grain boundaries caused by pre-deforming is the radical reason for the morphological transformation.

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