中国机械工程 ›› 2025, Vol. 36 ›› Issue (11): 2757-2765.DOI: 10.3969/j.issn.1004-132X.2025.11.034

• 先进材料加工工程 • 上一篇    

Ti2AlNb基合金热变形行为及加工图研究

周潼1(), 程军2, 王克鲁1(), 鲁世强1, 李鑫1, 刘杰1   

  1. 1.南昌航空大学材料科学与工程学院, 南昌, 330063
    2.西北有色金属研究院, 西安, 710016
  • 收稿日期:2024-12-23 出版日期:2025-11-25 发布日期:2025-12-09
  • 通讯作者: 王克鲁
  • 作者简介:周潼,2000年生,男,硕士研究生。研究方向为增材制造工艺参数优化。E-mail: 1826646458@qq.com
    王克鲁*(通信作者),男,1968年生,教授。研究方向为航空材料及金属材料微观结构调控研究。E-mail: wangkelu@126.com
  • 基金资助:
    国家自然科学基金(52271249);陕西省重点研发计划(2023-YBGY-488);江西省研究生创新专项基金(YC2023-020)

Hot Deformation Behavior and Processing Maps of Ti2AlNb-based Alloys

Tong ZHOU1(), Jun CHENG2, Kelu WANG1(), Shiqiang LU1, Xin LI1, Jie LIU1   

  1. 1.School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang,330063
    2.Northwest Institute for Non-Ferrous Metal Research,Xi’an,710016
  • Received:2024-12-23 Online:2025-11-25 Published:2025-12-09
  • Contact: Kelu WANG

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

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

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