摘要
采用Gleeble3500热模拟试验机对Ti2AlC/TiAl(Nb)复合材料进行高温压缩实验,实验温度范围为1000℃～1150℃,应变速率范围为10-3s-1～10-1s-1,工程压缩应变为50%,得到复合材料高温压缩真应力-真应变曲线。结果表明,Ti2AlC/TiAl(Nb)复合材料的高温变形流变应力对温度及应变速率敏感;流变应力随应变速率的增大而增大,随温度的升高而减小,可用位错-颗粒交互作用模型解释复合材料的应力-应变行为;Zenner-Hollomon参数的指数函数能够较好的描述该合金高温变形时的流变应力行为。建立的本构方程为ε=9.31×1011[sinh(0.0044σ)]2.52exp[-366.2/(RT)],其变形激活能为366.2kJ/mol。
Abstract： The hot compressive deformation behaviour of Tiz A1C/TiAI （Nb） composite was investigated in the temperature range of 1000℃-1150℃, at the strain rate range of 10-a s-110 -1s-1 and the engineering strain range of 50% on Gleeble3500 hot simulator. The true stress-true strain curves have been obtained. The results show that the flow stress is sensitive to temperature and strain rate. The flow stress increases with increasing the strain rate, and decreases with increasing the deformation tempera ture. This rule can be explained reasonably on the basis of the model of dislocation particulate interactions during the hot deform ation. The flow stress behaviour of Ti2AlC/TiAl （Nb） composite can be represented by a Zene;Hollomon parameter in the ex ponent style equation. The regressed expression is ε=9.31 ）4 10^11 Esinh（0. 0044σ）]2.52 expE--366.2/（RT）~. The hot deformation activation energy of Ti2 AlC/TiAl（Nb） composite during hot deformation is 366.2kJ/mol.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2013年第4期66-70,共5页
Journal of Plasticity Engineering
基金
973国家重点基础科研资助项目(2011CB605502)
