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自从1969年Bergersen和Stott提出捕获模型以来,正电子湮灭技术广泛地应用于晶格缺陷的研究。1978年Baran和Rosen第一次用多普勒展宽谱方法测量了冷加工镍、铜、银和金中的位错密度。Dlubek等人于1976年用角分布方法测量了镍中的位错密度及空位浓度随形变量的变化。他们的工作均限于纯金属。本工作用多普勒展宽谱方法测量了不同形变量下的海水用不锈钢中的位错密度,并给出了正电子比捕获速率。
Positron annihilation has been widely used in the study of lattice defects since Bergersen and Stott proposed the capture model in 1969. For the first time, Baran and Rosen (1978) measured dislocation densities in cold-worked nickel, copper, silver and gold using the Doppler broadening spectrum method. Dlubek et al. (1976) measured the variation of dislocation density and vacancy concentration in nickel with deformation by angular distribution method. Their work is limited to pure metal. In this work, the dislocation density in stainless steel for seawater under different deformations was measured by Doppler broadening spectral method and the positron-electron capture rate was given.