日本金属学会誌

J. Japan Inst. Metals, Vol. 53, No. 3 (1989),
pp. 281-289

Formation of Deformation Bands and Recrystallization in Aluminum Single Crystals Tensile-Deformed with a Two-Directionally Movable Apparatus

Fukuji Inoko1, Masao Kurimoto2 and Takanao Nagatomo3

1Department of Precision Mechanics, Faculty of Engineering, Tokushima University, Tokushima
2Department of Production Mechanics, Technical College of Tokushima University, Tokushima
3Undergraduate Student, Tokushima University, Tokushima. Present address: Kansai Nippon Denki Co., Ltd., Otsu

Abstract:

In order to clarify the influence of the grip effect on the formation of deformation bands, aluminum single crystals were deformed in tension by using an apparatus which can change the ratio of the horizontal velocity of the lower grip to the vertical one Vx/Vz. The relations between the deformation bands and the formation of recrystallized grains were examined.
The results obtained were as follows: (1) The grip effect was limited within the regions near the upper and the lower grips. (2) In the gauge length of all the specimens the deformation bands were formed with almost the constant number of 50 per 20 mm at the tensile strain around 3×10-1, even though the values of Vx/Vz was changed. In every specimen the angles between the specimen axis and both the deformation band and the primary slip band were approximately π /6 rad. (3) The formation of the deformation bands in the gauge length of the specimens did not depend on the grip effect, but on the intrinsic properties such as sub-boundaries. (4) The recrystallized grains were nucleated along the deformation bands. Their orientatxons were realized mainly by the rotation of deformed matrix about either one of the normals to four 111. Among them the rotation about the normal to the primary slip plane was dominant.


(Received 1988/9/12)

Keywords:

tensile deformation, aluminum single crystals, homogeneous and inhomogeneous deformation, deformation bands, kink bands, recrystallization, < 111 > rotation


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