Materials Transactions Online

Materials Transactions, Vol.58 No.02 (2017) pp.218-224
© 2017 The Japan Institute of Metals and Materials

Recrystallization Texture and Shear Band Formation in Bending

Hiroshi Kaneko1, Tatsuya Morikawa2, Masaki Tanaka2, Hirofumi Inoue3 and Kenji Higashida2

1Laboratories for fusion of core technologies, Furukawa Electric CO., LTD., Yokohama 220-0073, Japan
2Department of Materials Science and Engineering, Kyushu University, Fukuoka 819-0395, Japan
3Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan

The influence of texture on the shear bands and workability in bending was examined by using an age-hardened polycrystalline high concentration of Ni-Si copper alloys with various recrystallization textures. Samples with dominant the Cube orientation of {001}<100>, the RD-rotated Cube orientation of {012}<100>, the BR orientation of {362}<853>, and the R orientation of {231}<346> were employed. The formation of shear bands and the bending workability depended on the texture in the W-shape bending test, in which the bending direction was RD. The sample with a strongly developed Cube orientation showed the best bending workability. In comparison, the samples with the developed BR orientation and random orientation showed poor bending workability. The shape of the cracks generated by bending was linear, and these cracks developed in the shear bands, which were inclined at 35-40° from the surface. To elucidate the mechanism behind shear band formation, inhomogeneous deformations were investigated using the FE-SEM/EBSD method. The dependence on the crystallographic orientations was discussed using the full constraint Taylor model premising both the plane strain compression and the shear strain modes.

[doi:10.2320/matertrans.M2016363]

(Received 2016/10/17; Accepted 2016/12/05; Published 2017/01/25)

Keywords: recrystallization texture, shear band, bending workability, copper-nickel-silicon alloy, orientation distribution function, Cube orientation, Taylor factor

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