SiC_(f)/Ti2AlNb复合材料热等静压致密化过程的数值模拟  

Numerical Simulation of Hot Isostatic Pressing Densification Process of SiC_(f)/Ti2AlNb Composites

作　　者：杨克研 周文龙[1] 王敏涓 付雪松[1] 陈国清[1] 黄浩 Yang Keyan;Zhou Wenlong;Wang Minjuan;Fu Xuesong;Chen Guoqing;Huang Hao(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024;Titanium Alloy Research Institute,AECC Beijing Institute of Aeronautical Materials,Beijing 100095)

机构地区：[1]大连理工大学材料科学与工程学院,大连116024 [2]中航发北京航空材料研究院钛合金研究所,北京100095

出　　处：《航天制造技术》2025年第2期58-65,共8页Aerospace Manufacturing Technology

基　　金：国家科技重大专项(HT-J****-VI-****-0121);稳定支持项目(KZ0****526)。

摘　　要：基于ABAQUS有限元软件系统探究热等静压制备SiC_(f)/Ti2AlNb复合材料过程中的致密化演变特征,分析纤维排布方式、体积分数以及热等静压参数对复合材料致密化动力学行为的影响,探讨成型后材料内部残余应力场的空间分布以及热压参数对残余应力的影响规律。结果表明,复合材料的热等静压致密化过程呈现出5个阶段;相比四方纤维排布,六方纤维排布达到完全致密化的速度更快,但热等静压结束后,两种排布方式下的相对密度趋于相同;当SiC纤维体积分数为45%时,复合材料相对密度最低;热等静压温度和压力与复合材料的相对密度呈正相关;随着热等静压温度和压力升高,基体的径向热残余应力增加;适当提高热等静压压力,可有效降低基体的环向残余拉应力。The finite element simulation method was used to study the hot isostatic pressing densification process of SiC_(f)/Ti2AlNb composites,to analyze the effects of fiber arrangement,fiber volume fraction and hot isostatic pressing parameters on the densification of the composites and to explore the distribution of the thermal residual stresses in the composites after molding,as well as the influence of the hot pressing parameters on the residual stresses.The results show that the thermal isostatic densification process of the composites exhibits five stages;the hexagonal fiber arrangement reaches full densification faster than the tetragonal fiber arrangement,but at the end of the thermal isostatic pressing,the relative densities tend to be the same under both arrangements.The relative density of the composites is lowest when the volume fraction of SiC fibers is 45%.Thermal isostatic pressing temperature and pressure are positively correlated with the relative density of composites.As the thermal isostatic pressing temperature and pressure increase,the radial thermal residual stress of the matrix increases.Appropriately increasing the thermal isostatic pressing pressure can reduce the annular residual stress of the matrix.

关 键 词：钛基复合材料 SIC纤维 致密化 残余应力 有限元模拟 

分 类 号：V257[一般工业技术—材料科学与工程] TB333[航空宇航科学与技术—航空宇航制造工程]