ASSESSMENT OF THE INFLUENCE OF R-PHASE FORMATION ON THE MATERIAL BEHAVIOR OF NiTi USING A MICROMECHANICAL MODEL

被引：3
|
作者：
Heinen, Rainer [1 ,2 ]
Miro, Shorash [3 ]
机构：
[1] Ruhr Univ Bochum, Inst Mech, D-44780 Bochum, Germany
[2] ThyssenKrupp Steel Europe AG, Res & Dev, D-47161 Duisburg, Germany
[3] Ruhr Univ Bochum, Chair Coumputing Engn, D-44780 Bochum, Germany
来源：
FUNCTIONAL MATERIALS LETTERS | 2012年 / 5卷 / 01期
关键词：
Shape memory alloys; martensitic phase transformation; micromechanical modeling; NiTi; R-phase; SHAPE-MEMORY ALLOYS; MARTENSITIC-TRANSFORMATION; DEFORMATION; EVOLUTION; TENSION;
D O I：
10.1142/S1793604712500154
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Shape memory alloys (SMA) show several interesting features in their material behavior which are due to martensitic phase transformation. In NiTi, this transformation covers the three crystallographic phases of austenite, martensite, and R-phase. This publication analyzes the influence of the R-phase formation on the overall material behavior by means of a micromechanical model. The model is based on energy minimization with the assumption of a certain energy dissipation when martensite is formed. To simplify the formulation, the dissipation associated with the transformation between austenite and R-phase is neglected, since the geometrical change in unit cell geometry is relatively small in this case. Numerical simulations show that especially the slope reduction in the stress-strain curve, which is known from experiments, can be explained by R-phase formation.
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页数：4
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