一种钛基复合材料的热变形本构模型

Constitutive Modulus of Ti Based Composites in Hot Deformation

在Gleeble-1500热模拟试验机上进行热压缩试验,研究了变形温度为900～1150℃、应变速率为0.001～10s-1时TiC颗粒增强钛基复合材料的热变形行为,根据所得应力应变曲线分析了该合金的热变形特征,并采用双曲正弦模型建立了该钛基复合材料的本构关系。计算了α+β区域的平均变形激活能为691kJ/mol,β区域平均变形激活能为202kJ/mol。

The hot deformation behaviours of TiC particle reinforced Ti matrix composites were studied at 900～1150 ℃ and strain rate of 0.001～10 s-1. The compression testing was carried out on the Gleeble-1500 simulator by. On the basis of flow stress date obtained as a function of temperature and strain rate in compression, the deformation activation energy of 691 kJ/mol in α＋β region and 202 kJ/mol in β region were calculated and constitutive relations were established using hyperbolic sine constitutive equation.