Ti40(Ti-25V-15Cr-0.2Si)阻燃钛合金是β型钛合金.铸态组织中存在不同位向的孪晶,大孪晶中有许多平行的二次孪晶,沿孪晶界诱发微裂纹;高于850°C变形因动态回复形成了位错亚晶,变形温度越高亚晶越明显;850～1000°C变形孪晶与晶界交互作用及孪晶间的交互作用产生了微裂纹;孪晶的精细结构为位错;1100°C变形合金中不存在孪晶,在一些区域存在层错.
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