Ti2AINb基合金热变形行为及加工图研究

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关键词： Ti2AlNb 基合金；支持向量机；热变形行为；三维加工图

中图分类号：TG146.2

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

Abstract：The hot deformation behavior of Ti2AlNb -based alloys in the temperature range of 650～ （20 850°C and strain rate range of 0.001～1s-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 aloys increases with the decreasing of deformation temperature and the increasing of strain rate.The SVM model may accurately predict the flowbehavior of Ti2AlNb -based alloysunderdifferent deformation processing parameter conditions，with a correlation factor of O.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 beter hot deformation processing parameters for Ti2AlNb -based alloys under different strains are as 675～725∘C ， 0.001～0.003s-1 ，and the optimal hot deformation processing parameters are as 700∘C ， 0.001s-1 ：

Keywords： Ti2AlNb -based alloy；support vector machine（SVM）；hot deformation behavior；3D processing map

0 引言

Ti2AlNb 基合金具有比强度高、密度小、高温抗氧化性能好等特点，是航空发动机减重的理想轻质高温结构材料，可用于制造压气机盘、叶片等部件[1-2]。（剩余15338字）