Hot Deformation Behavior and Processing Maps of Ti2AlNb-based Alloys

doi:10.3969/j.issn.1004-132X.2025.11.034

Abstract

Abstract:

The hot deformation behavior of Ti₂AlNb-based alloys in the temperature range of 650~850 ℃ and strain rate range of 0.001~1 s^-1 was investigated by isothermal constant strain rate compression tests， and the three-dimensional processing maps were constructed based on dynamic material modelling. The flow stress curves of Ti₂AlNb-based alloys were analyzed and the SVM constitutive model was established， then the 3D processing maps were theoretically analyzed， and finally the accuracy of the constructed 3D processing maps was verified with the microstructures. The results show that the flow stress of Ti₂AlNb-based alloys increases with the decreasing of deformation temperature and the increasing of strain rate. The SVM model may accurately predict the flow behavior of Ti₂AlNb-based alloys under different deformation processing parameter conditions， with a correlation factor of 0.999 and an average relative error of 0.67%. The 3D processing maps show that the regions with high values of power dissipation efficiency η are concentrated in the region of low strain rate. The better hot deformation processing parameters for Ti₂AlNb-based alloys under different strains are as 675~725 ℃， 0.001~0.003 s^-1， and the optimal hot deformation processing parameters are as 700 ℃， 0.001 s^-1.

Key words: Ti₂AlNb-based alloy, support vector machine（SVM）, hot deformation behavior, 3D processing map

摘要：

通过等温恒应变速率压缩试验，研究了Ti₂AlNb基合金在650~850 ℃、应变速率0.001~1 s^-1范围内的热变形行为，并基于动态材料模型理论构建了三维加工图。分析了Ti₂AlNb基合金的流动应力曲线，建立了支持向量机本构模型，再对三维加工图进行了理论分析，最后结合微观组织验证了所构建三维加工图的准确性。研究结果表明，Ti₂AlNb基合金的流动应力随变形温度的降低和应变速率的增加而增大；支持向量机模型能准确预测Ti₂AlNb基合金在不同变形工艺参数下的流动行为，其相关系数为0.999，平均相对误差为0.67%；三维加工图表明，功率耗散效率η值较大的区域集中在低应变速率区域；不同应变下Ti₂AlNb基合金较好的热变形工艺参数范围为675~725 ℃、0.001~0.003 s^-1，最佳热变形工艺参数为700 ℃、0.001 s^-1。

关键词: Ti₂AlNb基合金, 支持向量机, 热变形行为, 三维加工图

CLC Number:

TG146.2

Tong ZHOU, Jun CHENG, Kelu WANG, Shiqiang LU, Xin LI, Jie LIU. Hot Deformation Behavior and Processing Maps of Ti₂AlNb-based Alloys[J]. China Mechanical Engineering, 2025, 36(11): 2757-2765.

周潼, 程军, 王克鲁, 鲁世强, 李鑫, 刘杰. Ti₂AlNb基合金热变形行为及加工图研究[J]. 中国机械工程, 2025, 36(11): 2757-2765.

Figures/Tables 10

Fig.1 Flow stress curves for Ti2AlNb-based alloy at different strain rates and deformation temperatures

Fig.2 Comparison of experimental and predicted values at different strain rates and temperatures

Fig.3 Correlation of predicted and experimental values of SVM

Fig.4 Effect of processing parameters on power dissipation efficiency under different strain conditions

Fig.5 Three-dimensional distribution diagram of power dissipation efficiency for Ti2AlNb-based alloy under different strains

Fig.6 Three-dimensional distribution diagram of power dissipation efficiency for Ti2AlNb-based alloys under different processing parameters

Fig.7 Processing maps of Ti2AlNb-based alloys under different true strains

Fig.8 Superposition map of instability region under different strains

Fig.9 Microstructure of better processing parameters under true strain of 0.5

Fig.10 Microstructure of the instability deformation under true strain of 0.5，strain rate of 1 s-1，deformation temperature of 650 ℃

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Hot Deformation Behavior and Processing Maps of Ti₂AlNb-based Alloys

Ti₂AlNb基合金热变形行为及加工图研究

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