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研究了18个取向B2结构Fe3Al单晶室温真空条件下的拉伸塑性变形,发现随晶体取向不同,切应力切应变曲线出现不同数目的线性硬化及抛物线软化阶段.曲线上不同硬化率各阶段的形成与塑性变形中滑移系的数量、次滑移作用的强弱及二分超位错的运动和分解状态有关.第Ⅰ阶段为单系滑移的易滑移段;第Ⅱ阶段对应共轭滑移的出现,硬化率较高;第Ⅲ阶段表现为比较弱的次滑移作用,硬化率较低;第Ⅳ阶段除了多系滑移之外还伴随二分超位错的扩展及拖着反相畴(APB)的不全超位错运动,硬化率最高;第Ⅴ阶段与分解了的单个超分位错的交滑移相关,表现为软化.随拉伸轴取向所处区域不同,切应力切应变曲线硬化段的数目及同一阶段硬化率的大小也不同.
The tensile plastic deformation of 18 oriented B2 Fe3Al single crystals at room temperature under vacuum was studied. It was found that the shear hardening shear strain and the parabolic softening phase appeared with the different crystal orientations. The curves of different hardening rates The formation is related to the number of slip systems in plastic deformation, the strength of sub-slip and the movement and decomposition state of the second-order super-dislocation.The first stage is the slippery section of single-slip system, the second stage corresponds to the conjugate Slippage appears higher hardening rate; the third stage showed a relatively weak sub-slip effect, the hardening rate is low; the fourth stage in addition to multi-line slip along with the extension of the second super-dislocation and dragged The incomplete super-dislocation motion of phase domain (APB) has the highest sclerosis rate. Phase V is related to the cross-slip of decomposed single super-dislocation, which shows softening. With the different orientation of the stretching axis, the shear stress The number of shear strain hardening curve and the same stage of the hardening rate is also different.