Materials Transactions Online

Materials Transactions, Vol.51 No.01 (2010) pp.14-22
© 2010 The Japan Institute of Metals

Heterogeneous Process of Disordering and Structural Refinement in Ni3Al during Severe Plastic Deformation by High-Pressure Torsion

Octav Ciuca1, Koichi Tsuchiya1,2, Yoshihiko Yokoyama3, Yoshikazu Todaka1 and Minoru Umemoto1

1Department of Production Systems Engineering, Toyohashi University of Technology, Toyohashi 441-8580, Japan
2Hybrid Materials Center, National Institute for Materials Science, Tsukuba 305-0047, Japan
3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

The process of grain refinement in Ni3Al by high-pressure torsion (HPT) was investigated up to 100 turns. The entire diametric sections of the deformed samples were analyzed by optical microscopy and image processing methods in order to evaluate both the spatial distribution and the volume fractions of the nanocrystalline and coarse grains. A thick band of nanocrystalline phase was formed in the middle section of the samples, and a structure containing mainly coarser ordered fragments was present in the vicinity of the top and bottom surfaces. Pseudo-twinning along {111} was observed at the boundaries of coarse-fragmented grains as well as the inside of the fragments and is put forward as a possible mechanism for disordering and nanocrystalline structure formation in Ni3Al.

(Received 2009/9/1; Accepted 2009/10/21; Published 2009/12/9)

Keywords: disordering, twinning, high-pressure torsion, nanocrystalline materials, intermetallic compound

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