金属热处理 ›› 2023, Vol. 48 ›› Issue (2): 232-241.DOI: 10.13251/j.issn.0254-6051.2023.02.037

• 数值模拟 • 上一篇    下一篇

热压工艺对SiCf/Ti复合材料界面反应层生长影响的数值模拟

唐洪武1,2, 张晓敏1,2, 赵志鹏1,2, 张恒嘉1,2   

  1. 1.重庆大学 航空航天学院, 重庆 400044;
    2.重庆大学 非均质材料力学重庆市重点实验室, 重庆 400044
  • 收稿日期:2022-09-23 修回日期:2022-12-25 出版日期:2023-02-25 发布日期:2023-03-22
  • 通讯作者: 张晓敏,教授,博士,E-mail:xiaomin@cqu.edu.cn
  • 作者简介:唐洪武(1996—),男,硕士研究生,主要研究方向为力-热耦合作用下材料的扩散-反应行为,E-mail:tanghongwu@cqu.edu.cn。
  • 基金资助:
    国家自然科学基金面上项目(11872130);重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0084)

Numerical simulation of effect of hot-pressing process on growth of interfacial reaction layer in SiCf/Ti composites

Tang Hongwu1,2, Zhang Xiaomin1,2, Zhao Zhipeng1,2, Zhang Hengjia1,2   

  1. 1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, China;
    2. Chongqing Key Laboratory of Mechanics of Heterogeneous Material Mechanics, Chongqing University, Chongqing 400044, China
  • Received:2022-09-23 Revised:2022-12-25 Online:2023-02-25 Published:2023-03-22

摘要: 提出一个热-力-扩散-反应强耦合相场模型来研究热压烧结制备工艺对连续碳化硅纤维增强钛基复合材料中金属间化合物生长规律的影响。模拟结果表明,在两种不同温度下各个界面反应层(Ti3SiC2/Ti5Si3Cx/Ti5Si3Cx+TiC/TiC)的厚度生长与试验值吻合较好。增大外加压力能促进界面层厚度的生长,但对其中抗拉强度最低的Ti5Si3层的生长起显著的抑制作用,同时使各界面反应层由周向拉应力状态逐渐转变为压应力。温度的升高使断裂韧度最大的Ti3SiC2层厚度增大,但也使总界面层和Ti5Si3层的厚度增加。因此,在制备工艺上适当增加压力并选择合适的温度,得到厚度适宜的界面反应层的同时,尽可能使Ti5Si3层变薄和Ti3SiC2层变厚是提高SiCf/Ti复合材料力学性能的重要途径。

关键词: SiC纤维增强钛基复合材料, 热-力-扩散-反应耦合, 相场法, 界面层生长, 热压烧结

Abstract: A phase field model based on strongly coupled thermo-mechano-diffusion-reactional theory was proposed to study the effect of hot-pressing sintering fabrication process on growth law of intermetallic compounds in the continuous silicon carbide fiber reinforced titanium matrix composites. The simulation results show that the thickness of each interface reaction layer is consistent with the experiment at two different temperatures. Further research shows that the applied load can promote the growth of interface reaction layer, but the growth of Ti5Si3 layer is significantly inhibited, which has the lowest tensile strength. With the increase of applied load, the circumferential stress changes from tension to compression. The thickness of Ti3SiC2 layer increases with temperature rising, which has the maximum fracture toughness, as well as the thickness of the total interface reaction layer and Ti5Si3 layer are also increased. Therefore, it is an important way to improve the mechanical properties of SiCf/Ti composites by properly increasing the pressure and selecting the appropriate temperature in the preparation process to obtain the interface reaction layer with the appropriate thickness, meanwhile, making the Ti5Si3 layer thinner and the Ti3SiC2 layer thicker as far as possible.

Key words: SiC fiber reinforced titanium matrix composites, thermo-mechano-diffusion-reactional coupling, phase field method, interface layer growth, hot-pressing sintering

中图分类号: