B2结构Fe3Al单晶在室温拉伸过程中的取向转动

借助于ＥＢＳＤ方法，研究了８个位向Ｂ２结构Ｆｅ３Ａｌ单晶室温拉伸变形时晶体取向的转动。结果表明，无论原始取向如何，在拉伸过程中晶体拉伸轴总会向着〈１１０〉方向转动，也即〈１１０〉为稳定取向。当晶体拉伸轴转向取向三角形中部的软取向时，晶体表现为几何软化，相应的加工硬化率较低。反之，当晶体拉伸轴转向〈００１〉－〈１０１〉对称线时，晶体表现为几何硬化，相应的加工硬化率较高。当拉伸轴处于软取向时，单晶试样

THE ROTATION OF THE B2-ORDERED Fe3Al SINGLE CRYSTAL DURING ROOM TEMPERATURE TENSILE

The rotation of the tensile axis of B2-ordered Fe3Al single crystals with various orientations was investigated, whatever the tensile axis of the specimen is, it would always rotate towards orientation <110>, showing the orientation <110> to be the stable orientation for this kind of crystals. The crystals whose tensile orientations rotated to the middle part of the orientation triangle exhibit low work--hardening rate, and the plate surface orientations rotate to (111). When tensile axis rotated to the highly symmetrical orientation the crystal has very high work--hardening rate, and the plate surface orientations rotate to (110). Rotations of the tensile axis towards (110) correspond to the formation of {001}<110> fiber texture of the B2-ordered Fe3Al polycrystal; rotations of the plate surface towards (111) correspond to the {111} texture; rotations of the plate surface towards (110) correspond to the shear texture {110}<001>.