PM Rene95合金中夹杂物的微观力学行为

Micro-mechanical Behavior of Non-meta1lic Inclusion in PM Rene 95 Alloy under Uniaxial Tension Stress

采用人工植入Ａｌ２Ｏ３夹杂物的试样，通过ＳＥＭ原位观察及非线性有限元分析，研究了 在单轴拉伸条件下Ｐ／Ｍ Ｒｅｎｅ ９５合金中夹杂物与基体的相互作用机理．结果表明，不同尺寸及 位置的夹杂物对拉伸进程影响不同；夹杂物／基体界面的裂纹萌生及扩展取决于界面附近基体 材料的应力状态．

The special designed SEM in-situ tensile tests have been conducted tO trace the whole process of crack initiation and propagation till to fracture in Al2O3 seeded P/M Rene 95 alloy And the distriblltion of stress and strain around inclusions has been calculated by means of an elasto-plastic finite element method (FEM) model with the commercial software ANSYS. The results show that the characteristic parameters of inclusions such as the size, position etc. have different effect on the tension process; and initiation and propa- gation of the crack at inclusion/medix interface are mainly determined by the stress distribulion of matrix in or near this region.