摘要
采用佩尔斯纳巴罗的部分离散位错模型,计算了磁场中直刃型位错的错排能,推导出在静磁场中位错滑移所需克服晶体点阵阻力的最大值———佩纳力,给出了佩纳力与磁场强度、材料性质间的关系.结果表明:若材料中的位错具有顺磁性,佩纳力的值比无磁场时的值减少,位错更容易运动,材料塑性增强.该结论与已有的磁塑效应实验中观察到的现象一致.当磁场为0时,所得佩纳力的值可退化为已知的原佩纳力.
Peierls-Nabarro model is used to study the effect of magnetic fields on a straight edge dislocation. The Peierls-Nabarro force is calculated according to the model. The result shows that, in the presence of an external magnetic field, the Peierls -Nabarro force decreases for paramagnetic dislocations. This suggests that the plasticity of specimen can be increased because paramagnetic dislocations are easier to move in an external magnetic field due to the decrease of the critical shear stress. The result is consistent with the known magnetoplasticity effect.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2007年第2期113-115,共3页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(19977011)
关键词
佩-纳力
位错
磁塑效应
Peierls-Nabarro force
dislocation
magnetoplasticity
