Deformation instability and pattern evolution during phase transformation

Qingping Sun 

Hong Kong Univ. of Science and Technology (HKUST), Clear Water Bay, Hong Kong Kowloon, Hong Kong

Abstract

This talk reports the deformation instability and pattern evolution during stress-induced martensitic phase transformation in a superelastic NiTi polycrystalline shape memory alloy microtube. High-speed data and image acquisition techniques were used to investigate the dynamic as well as quasistatic events which took place during displacement controlled quasi-static tensile loading/unloading process of the tube. These events include dynamic formation, self-merging, topology transition, convoluted front motion and front instability of a macroscopic deformation band (domain). Nonlocal modeling and numerical simulations on the experimental phenomena are also reported briefly in the talk.

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Presentation: invited oral at E-MRS Fall Meeting 2005, Symposium C, by Qingping Sun
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-26 12:40
Revised:   2009-06-07 00:44
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