Pseudoelastic deformation and size effects during in situ transmission electron microscopy tensile testing of NiTi

被引：30

作者：

Manchuraju, S. ^{[1
]}

Kroeger, A. ^{[2
]}

Somsen, C. ^{[2
]}

Dlouhy, A. ^{[3
]}

Eggeler, G. ^{[2
]}

Sarosi, P. M. ^{[4
]}

Anderson, P. M. ^{[1
]}

Mills, M. J. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43201 USA

[2] Ruhr Univ Bochum, Inst Werkstoffe, Lehrstuhl Werkstoffwissensch, D-44801 Bochum, Germany

[3] ASCR, Inst Phys Mat, Brno 61662, Czech Republic

[4] GM Res & Dev Tech Ctr, Warren, MI 48090 USA

来源：

ACTA MATERIALIA | 2012年 / 60卷 / 6-7期

基金：

美国国家科学基金会;

关键词：

Martensitic phase transformation; In situ TEM; Shape memory alloys; Crystallographic theory of martensite; SHAPE-MEMORY ALLOYS; MARTENSITIC PHASE-TRANSFORMATION; SINGLE-CRYSTALS; COMPRESSION PILLARS;

D O I：

10.1016/j.actamat.2012.01.043

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The stress-induced B2-B19' transformation in aged 51 at.% NiTi was investigated using in situ straining transmission electron microscopy (TEM). Increased applied strain along [1 1 0](B2) transforms B2 into plates containing B19' variants that are related by a (1 1 0)(B2) compound twin plane. This atypical twin plane is explained by relaxing the invariant plane constraint in the crystallographic theory of martensite (CTM) to an invariant line constraint. The relaxation is rationalized from the thin foil geometry. The relaxed CTM approach, coupled with conditions to maximize transformation strain along the loading axis and minimize elastic energy, predicts the observed twin interface, diffraction patterns, and interface with the B2 austenite. These results demonstrate subtleties in interpreting thin foil TEM results regarding martensitic transformations, and translating those results to bulk response. (C) 2012 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：2770 / 2777

页数：8

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