Behavior of vacancies near edge dislocations in Ni and α-Fe : Positron annihilation experiments and rate theory calculations
Behavior of vacancies near edge dislocations in Ni and α-Fe : Positron annihilation experiments and rate theory calculations
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DOI：
10.1103/physrevb.75.094109
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发表时间：
2007-03
影响因子：
3.7
通讯作者：
Koichi Sato;T. Yoshiie;T. Ishizaki;Qiu Xu
中科院分区：
文献类型：
--
作者：
Koichi Sato;T. Yoshiie;T. Ishizaki;Qiu Xu
为了研究刃位错附近空位的行为，测量了高速和低速变形的Ni和Fe的正电子湮没寿命和符合多普勒展宽。计算了与刃型位错有关的空位的形成能、迁移能和正电子湮没寿命。在实验中，证实了先前由Häkkinenet等人和Kamimuraet等人通过计算预测的与刃位错相关的空位的存在。在Fe中等时退火10小时，刃位错中的空位被释放.这些实验结果解释了基于速率理论的计算。研究了空位沿沿着刃位错扩散的影响，所得结果与以前用放射性示踪法研究空位沿沿着位错自扩散的实验结果一致。
In order to study behaviors of vacancies near edge dislocations, the lifetime and coincidence Doppler broadening of positron annihilation on Ni and Fe deformed at high speed and low speed were measured. The formation and migration energies and positron annihilation lifetime of vacancies associated with edge dislocations were also calculated. In the experiments, the existence of vacancies associated with edge dislocations, previously predicted by Häkkinenet al.and Kamimuraet al.from calculations, was confirmed. Vacancies were released from the edge dislocations atin isochronal annealing for 10 hours in Fe. These experimental results were explained by a calculation based on a rate theory. The effect of vacancy diffusion along edge dislocations was also studied, and the obtained results corresponded to those of previous experiments on vacancy self-diffusion along dislocations using the radioactive tracer method.