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Study on high-temperature deformation mechanical behavior and dynamic recrystallization kinetics model of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-09-25 , DOI: 10.1016/j.jallcom.2021.162105
Xuejian Lin 1 , Hongjun Huang 1 , Xiaoguang Yuan 1 , Yinxiao Wang 1 , Bowen Zheng 1 , Xiaojiao Zuo 1 , Ge Zhou 1
Affiliation  

The high-temperature deformation mechanical behavior and dynamic recrystallization(DRX) kinetics model of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy were studied by thermal compression tests on a Gleeble thermal simulator. The influences of deformation heat and friction on rheologic stress were calculated and corrected. The results show that the rheologic stress corrected by friction is less than the experimental stress value. This shows that the existence of interface friction has a negative effect on stress. The influence of deformation heat on the stress is significant at lower temperatures and higher strain rates. The stress-strain curve shows the peak stress at low strain, and then descends with increasing of strain. Based on the curve of the work hardening rate versus stress (dσ⁄dε versus σ) the characteristic strain of the alloy was determined, containing the critical strain of DRX and peak strain, and the expression between the critical stress of DRX, the peak stress and the Z parameters was established. To describe the variation law of the DRX volume fraction, DRX kinetics were examined. The Avrami index values of the alloy were all less than 2 within the parameters of this experiment. The smaller Avrami index of this alloy indicates that the recrystallization rate is lower than that of ordinary alloy. The fraction of DRX rises with increasing of strain. That is, the higher the thermal deformation strain is, the higher the external input energy and the greater the degree of DRX. At the same strain rate, the peak value of the DRX growth rate increses with the increasing of temperature, which reflects the effect of the thermal activation energy on the DRX dynamics.



中文翻译:

Ti-47.5Al-2.5V-1.0Cr-0.2Zr合金高温变形力学行为及动态再结晶动力学模型研究

在Gleeble热模拟器上通过热压缩试验研究了Ti-47.5Al-2.5V-1.0Cr-0.2Zr合金的高温变形力学行为和动态再结晶(DRX)动力学模型。计算并修正了变形热和摩擦对流变应力的影响。结果表明,经摩擦修正的流变应力小于实验应力值。这说明界面摩擦的存在对应力有负面影响。在较低温度和较高应变率下,变形热对应力的影响是显着的。应力-应变曲线显示低应变时的峰值应力,然后随着应变的增加而下降。根据加工硬化率与应力(dσ⁄dε 与 σ)的曲线,确定合金的特征应变,包含 DRX 临界应变和峰值应变,建立了 DRX 临界应力、峰值应力和 Z 参数之间的表达式。为了描述 DRX 体积分数的变化规律,研究了 DRX 动力学。该合金的 Avrami 指数值在本实验参数范围内均小于 2。该合金的 Avrami 指数较小表明再结晶速率低于普通合金。DRX 的分数随着应变的增加而增加。即热变形应变越高,外部输入能量越高,DRX 程度越大。在相同的应变速率下,DRX 生长速率的峰值随着温度的升高而增大,这反映了热活化能对 DRX 动力学的影响。

更新日期:2021-09-27
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