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本文利用晶体学知识和位错理论,对测量位错密度常用的割线交点公式2MN/(lt)进行了分析,认为这种测量方法产生误差的主要原因之一是难以选择适当的操作矢量g,以保证全部位错成象从而得到准确的N值。同时还发现了为使尽可能多的位错成象g的选择应该满足的方程组。
Based on the knowledge of crystallography and the theory of dislocation, this paper analyzes the common 2-Mbit / s (2MN / 2) cut-off point formula for measuring dislocation density. It is considered that one of the main reasons for the error of this method is that it is difficult to select the proper operation vector g , In order to ensure that all dislocation imaging in order to get accurate N value. At the same time, we also found that the choice of g to maximize the number of dislocations should satisfy the choice of equations.