摘要
对锻态Ti3Al基合金进行了压缩实验,研究其在近等温变形过程中的组织变化规律。结果表明随着变形温度的升高,初生2α条变粗,且大部分α2相趋于等轴状。尽管应变速率对α2相的含量影响不大,但对其尺寸和形貌却有较大的影响。较高的应变速率能够增加畸变能,有利于细化晶粒。由于10%的变形量较小,只有较少量位于有利变形方向的条状α2相被破碎而呈现出等轴状。而当变形量从10%增加到30%时,α2相颗粒均为等轴状,其尺寸随着变形量的增加先减小后增大。尺寸增大的原因是由于两个相互独立的硬α2相之间的软β相在变形力的作用下被挤开而靠近,最终靠扩散长大成一体;或是初生α2相在缓慢变形过程中吞并其周围新生的细小α2相而长大。
The compression tests of the as-forged Ti3 Al based alloy were performed, and its microstructure evolution was investigated. The results show that the primary α2 phases are coarsened and most of them are prone to be equiaxed with increasing deformation temperature. Although strain rate has little effect on volume fraction of α2 phase, it exhibits a significant effect on its size and shape. Only a few of the lath α2 phases locating in vantage deformation direction are broken due to small deformation of 10% . When deformation is increased from 10% to 30%, the α2 phase is exquiaxed and its size firstly decreases then increases. The reason for increasing size is that the soft β phases between two hard α2 phases are forced out, so the α2 phases approach and grow up to be one by diffusion, or the primary α2 phases merge the fine α2 phase around them and grow up.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第3期76-79,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目(50775187)
关键词
TI3AL基合金
近等温变形
组织
变化规律
Ti3 Al based alloy
near isothermal deformation
microstructure
change rule
