Deformation Heterogeneity and Texture Evolution of NiTiFe Shape Memory Alloy Under Uniaxial Compression Based on Crystal
- PDF / 4,120,169 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 64 Downloads / 206 Views
JMEPEG DOI: 10.1007/s11665-017-2678-7
Deformation Heterogeneity and Texture Evolution of NiTiFe Shape Memory Alloy Under Uniaxial Compression Based on Crystal Plasticity Finite Element Method Yulong Liang, Shuyong Jiang, Yanqiu Zhang, Yanan Zhao, Dong Sun, and Chengzhi Zhao (Submitted October 29, 2016; in revised form March 15, 2017) Crystal plastic finite element method (CPFEM) is used to simulate microstructural evolution, texture evolution and macroscopic stress-strain response of polycrystalline NiTiFe shape memory alloy (SMA) with B2 austenite phase during compression deformation. A novel two-dimensional polycrystalline finite element model based on electron back-scattered diffraction (EBSD) experiment data is developed to represent virtual grain structures of polycrystalline NiTiFe SMA. In the present study, CPFEM plays a significant role in predicting texture evolution and macroscopic stress-strain response of NiTiFe SMA during compression deformation. The simulated results are in good agreement with the experimental ones. It can be concluded that intragranular and intergranular strain heterogeneities are of great importance in guaranteeing plastic deformation compatibility of NiTiFe SMA. CPFEM is able to capture the evolution of grain boundaries with various misorientation angles for NiTiFe SMA subjected to the various compression deformation degrees. During uniaxial compression of NiTiFe SMA, the microstructure evolves into highenergy substructure and consequently the well-defined subgrains are formed. Furthermore, the grain boundaries and the subgrain boundaries are approximately aligned with the direction in which metal flows. Keywords
crystal plasticity, finite element method, plastic deformation, shape memory alloy, texture evolution
1. Introduction NiTi shape memory alloy (SMA) has attracted increasing attention because of its shape memory effect and superelasticity (Ref 1, 2). The phase transformation temperature plays an important role in the engineering application of NiTi SMA (Ref 3). In general, the addition of a third element to binary NiTi SMA has a significant influence on the phase transformation temperature (Ref 4, 5). The substitution of Fe element for Ni element in the binary NiTi SMA contributes to lowering the martensitic transformation start temperature (Ref 6, 7). As a consequence, NiTiFe SMA has been a primary candidate for pipe coupling. However, the microstructure and the texture have a significant influence on shape memory effect and superelasticity of NiTiFe SMA (Ref 8, 9). In particular, plastic deformation plays a predominant role in microstructure evolution and texture evolution of NiTiFe SMA (Ref 10, 11). Therefore, it is of great importance to investigate microstructure evolution and texture evolution of NiTiFe SMA during plastic deformation. Yulong Liang, College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China; and College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Shuyong Jiang,
Data Loading...
