【摘要】 本文在文献[1]的基础上,用电子显微镜透射方法研究了一种镍基合金(Ni 80 Cr 20 Ti)在高温蠕变第一和第二阶段内的位错结构。对蠕变第一阶段进行了较多的观察和分析。结果表明,在高温蠕变第一阶段内,形成了大量的零散位错,它们一般不处在滑移面上,并且大多是混合型位错,因此,它们是刃型位错攀移和螺型位错交滑移联合作用的结果。更多还原

【Abstract】 On the basis of the previous paper [1], dislocation structures in the primary and secondary stages of high temperature creep of a nickel base alloy (Ni80Cr20Ti) have been studied by transmission electron microscopy. The observations and analyses have been emphasized on the primary stage. It is shown that, in the primary stage of high temperature creep, a large number of individual dislocations are formed. They generally do not lie on the slip planes. The majority of them are shown to be mixed type dislocations. It is concluded that such kind of dislocations is a product of the combination of climbring of edge dislotions and cross slipping of screw dislocations.更多还原