Fe-Mn-Ni-Si四元合金中辐照缺陷对辐照硬化的贡献

Contribution of Irradiation-Induced Defects to the Irradiation Hardening of Fe-Mn-Ni-Si Quaternary Alloy Under Ion Irradiation

目的研究Fe-Mn-Ni-Si四元合金在350℃下受到离子辐照后产生的辐照缺陷对于辐照硬化的贡献。方法对辐照前后样品进行纳米压痕测试,获得硬度增量来衡量辐照硬化;再通过三维原子探针及透射电镜等表征手段,获得样品辐照后产生的团簇的数量密度、体积分数、团簇尺寸、位错环密度、位错环尺寸大小等微观结构信息;结合Dispersed Barrier Hardening Model估算团簇及位错环产生的硬度增量;最后与使用纳米压痕仪测得的硬度增量进行对比。结果通过模型估算结果可知,团簇对硬度增量的贡献大于位错环对硬度增量的贡献;模型估算得出的团簇及位错环对硬度增量的贡献之和略小于测得的实际硬度增量的值。结论使用辐照后的微观结构信息,通过模型估算得到的硬度增量之和能够反应宏观上辐照硬化的变化。然而,受制于表征手段分辨率及其他原因,模型估算出来的硬度增量与实际测得的硬度增量略有差异。

The purpose of this paper is to understand the contribution of irradiation-induced defects to irradiation hardening under ion irradiation for 350℃.Nanoindentation test was carried out on the samples before and after irradiation,and the hard ness increment was obtained to measure the irradiation hardening.The atom probe tomography was used to extract the microstructure information of clusters,such as number density,volume fraction and size of cluster.The transmission electron microscope was used to analysis the number density and the size of the irradiation-induced dislocation loops.The Dispersed Barrier Hardening Model was applied to estimate the hardness increment from clusters and dislocation loops.And then,it is compared with the hardness increment measured by nanoindenter.Based on the estimated result,the contribution of clusters to the hardness increment is greater than the contribution of dislocation loops.The sum of the contributions of clusters and dislocation loops to the hardness increment estimated by the model is slightly smaller than the measured hardness increment.As a conclusion,the sum of hardness increments estimated by the model based on the microstructure information can generally reflect the changes of irradiation hardening.However,due to the resolution of the characterization methods and other reasons,there are small discrepancies between the hardness increment estimated by the model and the actually measured hardness increment.