摘要
研究了变质剂 Ti、B- Ti及 Zr对 ZA2 7合金铸态组织和半固态等温热处理组织的影响。结果表明 :Zr的变质效果最好 ,下来依次是 B- Ti、Ti;经半固态等温热处理后都可获得触变成形所需的半固态非枝晶组织 ,但变质组织越细 ,越易获得良好的非枝晶组织 ,变质效果越差 ,需要热处理的时间越长或温度越高。
The effects of modifiers,such as Ti,B Ti and Zr on as cast microstructure and semi solid isothermal heat treated microstructure were investigated.The results showed that the modification effect of Zr is the best one,followed by B Ti and Ti successively.The non dendritic structure for thixo forming could be obtained when ZA27 alloy modified by these elements was heat treatd at semi solid temperature.The smaller the modified structure was,the easier the non dendritic structure could be obtained,and the more developed and the coarser the dendritic structure was,the longer the time or the higher the temperature was needed.
出处
《热加工工艺》
CSCD
北大核心
2001年第4期23-25,共3页
Hot Working Technology
基金
甘肃省中青年科技基金项目 ( YS981 - A2 2 - 0 0 5 )
