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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 experiment of Ti3Al-based alloy was carried out and the microstructure of Ti3Al-based alloy was studied during the near-isothermal deformation. The results show that as the deformation temperature increases, the primary 2α becomes thicker, and most of the α2 phase tends to be equiaxed. Although the strain rate has little effect on the content of α2 phase, it has a great influence on its size and morphology. Higher strain rates increase the distortion energy and help refine grains. Since 10% of the deformation is small, only a small amount of the strip-shaped α2 phase located in the favorable deformation direction is broken and equiaxed. When the amount of deformation is increased from 10% to 30%, the α2 phase particles are equiaxed, and their size decreases and then increases with the increase of deformation. The reason for the increase in size is that the soft β phase between two hard α2 phases that are independent of each other is squeezed apart by the deformation force to be close together and finally grows into a single body by diffusion or the primary α2 phase is slowly deformed Grew up by annexing the tiny α2 phase of newborn around it.