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对2种钽钨合金(Ta-2.5W和Ta-10W,钨的质量分数分别为2.5%和10%)的准静态和动态变形行为进行了系统研究。根据准静态压缩实验、霍普金森压杆(SHPB)实验结果,表明2种钽钨合金的流动应力对加载应变率和钨的含量较为敏感,并拟合得到了2种钽钨合金的JC本构模型参数。其次,为验证本构模型的合理性,开展了泰勒撞击实验和数值模拟研究,应变率范围为10~3~10~4 s~(-1),数值模拟得到的泰勒杆侧轮廓与撞击端面轮廓与实验吻合较好。最后,为研究钽钨合金变形后的细观特性,对杆件进行了光学显微照片分析。本研究方法与结果可为材料本构关系的确定提供借鉴。
The quasi-static and dynamic deformation behaviors of two kinds of tantalum tungsten alloys (Ta-2.5W and Ta-10W, 2.5% and 10% respectively) were studied systematically. According to quasi-static compression experiment and Hopkinson pressure bar (SHPB) experimental results, it is shown that the flow stress of two kinds of tantalum tungsten alloys is sensitive to loading strain rate and tungsten content, and JC of two kinds of tantalum tungsten alloys Model parameters. Secondly, in order to verify the rationality of the constitutive model, Taylor impact experiments and numerical simulation were carried out. The strain rate range was 10 ~ 3 ~ 10 ~ 4 s ~ (-1) The contour is in good agreement with the experiment. Finally, in order to study the mesoscopic characteristics of the deformed tantalum tungsten alloy, optical micrographs of the rods were analyzed. The research methods and results can provide reference for the determination of constitutive relations of materials.