Experimental Verification of Homogeneous/ Heterogeneous Deformation in High Temperature Creep of Inclusion Bearing Material

对复合材料高温变形的重要基本过程——塑性调节蠕变进行了理论分析。分析了塑性调节蠕变的基本概念，揭示了两种以上位错同时向上和向下爬，爬过一个粒子，没有长距离扩散。采用Ti/15vol%TiB原位复合材料，在与TiB晶须垂直的方向上对塑性调节蠕变进行了两次直接观察。一种是利用电子光刻技术绘制的微网格线观测非均匀变形，另一种是利用EBSP方法观测晶格旋转。

A theoretical analysis was discussed on plastically accommodated creep, an important elementally process working in high temperature deformation of a composite. The basic concept of plastically accommodated creep was analyzed and revealed that more than two kinds of dislocations climbs up and down simultaneously, to climbs over a particle, without long distance diffusion. Two direct observations of the plastically accommodated creep were performed using Ti/15vol%TiB in situ composite in the perpendicular direction to TiB wiskers. One is observation of heterogeneous deformation using microgrid lines drawn by electron lithography technique, and another is observation of crystal lattice rotation using EBSP method.