采用系列温度及不同应变速率条件下的压缩试验研究TiAl,TiAl-V的塑性形变行为结果表明,在不同温度区间,Peierls—Nabarro机制,交滑移机制和蠕变为塑性形变的主要控制机制,TiAl-V合金在600—700K形变时出现反常应变速率效应,而且塑性应变量越大.反常效应越明显,利用位错交滑移的热激活特性理论对此反常效应进行初步解释,温度和应变速率对加工硬化指数的影响及不同塑性应变量对应变速率敏感性的影响在本文中也进行了探讨。
Plastic deformation of TiAl and TiAl-V intermetallic compounds has been stu-died by compression experiment at various temperatures and strain rates. Results show that theplastic deformation in distinct temperature range is principally controlled by the mechanisms ofPerierls-Nabarro, cross slip and creep of dislocation. For TiAl-V alloy deformed at a range of600--700 K, the negative strain rate dependence of flow stress was observed, i. e., the more theplastic strain is, the more the negative dependence will be. A possible mechanism of the anomalycould be interpreted by thermal activation of dislocation cross slipping. The effects of tempera-ture and strain rate on work-hardening exponent were also studied and discussed.
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