Gengxiang HU
,
Shipu CHEN
,
Xiaohua WU
,
Yonghua RONG and Xiaofu CHEN(Dept. of Materials Science
,
Shanghai Jiao Tong University
,
Shanghai
,
200030
,
China)
材料科学技术（英文）
The deformation behaviour and the nature of dislocations of the Al3Ti-base L12 alloya modified with Fe and Mn etc, were investigated. The results show that the deformation and fracture character istics are closely related to the alloy compositions. The effect of hot-working process on the room tem perature ductility is remarkable, not only resulting in an appreciable improvement of compressive properties but also showing a 0.28% plastic strain in tensile test. The SISF dissociation of a < 110>dislocations on {111} planes was found at room temperature. The determined dissociation scheme is consistent with the mechanical behaviour of these alloys in the lower temperature region.
关键词:
Yonghua RONG
,
Gang HE
,
Shipu CHEN
,
Genxiang HU
,
Ming GAO
,
Robert P.WEI
材料科学技术（英文）
The methods for determining electron beam direction and misorientation angle/axis of grain boundaries are described in this paper. The present methods are based on a series of diffraction spot patterns obtained by systematic tilt of the crystal, combined with simple mathematical calculations. Instead of the use of Kikuchi patterns, the limitations resulting from the visibility or sharpness of Kikuchi lines and the number of Kikuchi pole(s) existed are avoided and a sufficient accuracy of determination has been achieved.
关键词:
