Synergistic Effects among the Structure, Martensite Transformation and Shear Band in a Shape Memory Alloy-Metallic Glass
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Synergistic Effects among the Structure, Martensite Transformation and Shear Band in a Shape Memory Alloy-Metallic Glass Composite Xudong Zhang 1 & Junqiang Ren 2 & Xiangdong Ding 1
Received: 24 April 2018 / Accepted: 2 May 2018 # Springer Science+Business Media B.V., part of Springer Nature 2018
Abstract In this work, we use the finite element method to investigate the free volume evolution, as well as the martensite transformation effect and its connection with the pretreatment strain, in a shape memory alloy-metallic glass composite. Our simulation results show that the martensite phase transformation can enhance the blocking effect while relieving the free volume localization. The synergistic effect among the martensite transformation effect, blocking effect, and shear band interaction in the composite is responsible for the tensile plasticity and work-hardening capability. In addition, we design a Sierpinski carpet-like fractal microstructure so that the composite exhibits improved tensile performance as a result of the enhanced synergistic effect. However, the tensile performance of the composite deteriorates with increasing pretreatment strain since the martensite transformation effect is weakened. Keywords Metallic glass . Shape memory material . Composite materials . Fractal . Finite element method
1 Introduction Bulk metallic glasses (BMGs) have attracted great attention because of their excellent strength and large elastic strain limit. However, their tensile brittleness has been a stumbling block for structural applications [1]. To overcome this challenge, many
* Xudong Zhang [email protected] * Xiangdong Ding [email protected]
1
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
2
State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
Appl Compos Mater
efforts have been made to design and develop metallic glass (MG) heterostructures, such as MG composites reinforced with secondary crystalline phases [2, 3], porous MGs [4, 5] and MGs with a non-uniform distributed free volume [6, 7]. These strategies provide a Bblocking effect^ because the heterogeneous microstructures act as strong barriers for the propagation of shear bands, resulting in improved tensile plasticity. When a shape memory alloy (SMA) is integrated as the crystalline phase that undergoes a stress-induced martensitic transformation from a B2 to a B19′ structure during deformation, the SMA-reinforced MG composite (SMA-MG) exhibits a large tensile ductility with a work-hardening capability [1, 8]. This effect can be largely ascribed to the Bphase transformation effect^ by the martensite transformation from the B2-B19’ phases [9], which can release the stress concentration and restrict free volume accumulation [9, 10]. However, previous studies regarding the structure-property relationships in MG heterostructures implemented by finite element simulations only focused on porous MGs or an MG comp
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