Ti-6Al-4V合金超塑性变形中α相的滑移系统及位错分布特征

SLIP SYSTEMS AND DISLOCATION DISTRIBUTION CHARACTERISTICS IN α-PHASE OF SUPERPLASTICALLY DEFORMED Ti-6Al-4V ALLOY

本文采用TEM系统操作方法分析了Ti-6Al-4V合金超塑性变形中α相激活的滑移系统。结果表明α相以{0110}〈2110〉和{0111}〈2110〉激活为主,降低变形温度{0001}〈2110〉基面滑移及b=〈1123〉的α+c型位错亦参与变形。大量观察还表明,α相中激活的位错主要分布在三岔晶界、α/α晶界、以及α/β相界附近。

The activated slip systems in the α-phase of the superplastically de-formed Ti-6Al-4V alloy were analysed by systematic operation method with TEM.The results show that the dominantly activated slip systems in the α-phase are{0110} <21l0> and {0111} <2110>. The {0001} <2110> system as well as the c+αdislocations of b=1/3<1133> will be activated when the deformation temperatureis lowered. Large amounts of TEM observation indicate that the dislocations in theα-phase were mainly activated near the triple grain boundary junctions, α/α grainboundaries, and α/β interfaces.