搅拌铸造ZA27合金的组织与性能  

Microstructure and Properties of Stir-cast ZA27 Alloy

作　　者：刘国钧[1] 张奎[1] 张景新[1] 徐骏[1] 

机构地区：[1]北京有色金属研究总院

出　　处：《特种铸造及有色合金》2000年第1期10-12,共3页Special Casting & Nonferrous Alloys

摘　　要：研究了在非稳态条件下，搅拌铸造工艺参数对ＺＡ２７合金的凝固过程及初生相组织形貌转变的影响。结果表明，当持续电磁搅拌时，凝固组织中的初生相能变为细小的近似球形的颗粒，而其主要力学性能与经Ｔｉ－Ｂ变形处理的结果相近；如果搅拌后的冷却速度较快，则使包晶反应减少，初生非枝晶固相颗粒和非平衡共晶组织增多。研究还发现，温度和搅拌速度能控制ＺＡ２７合金半固态浆料的初生相分数及分布，随着搅拌速度或搅拌时间的增加，基体组织的成分变得比较均匀，初生相趋于非枝晶化。The effects of casting process parameters on transformational behavior of primary nondendrite phase and solidification process of ZA27 alloy in stirring are investigated under transient condition. The results show that primary phase in solidification structure evolves into near-spherical fine particles by constant electro-magnetic stirring, and main mechanical properties are similar to those alloys inoculated with Ti-B; with a larger secondary cooling rate, the peritectic reaction decreases and the primary non-dendrite and non-equilibrium eutectic structure increases. It is also found that temperature and stirring rate can control the fraction and distribution of primary phase in ZA27 semi-solid slurry. With the increase of stirring rate or time, the matrix composition become more homogeneous, and the primary phase tends to non-dendrite.

关 键 词：电磁搅拌 组织 力学性能 锌铝合金 铸造 

分 类 号：TG21[金属学及工艺—铸造]