Numerical investigation of the mechanical behaviour of shape memory bulk metallic glass composites

Wenyi Yan; Goseph Tilvawala; Qianhua Kan

doi:10.1117/12.920949

2 April 2012 Numerical investigation of the mechanical behaviour of shape memory bulk metallic glass composites

Wenyi Yan, Goseph Tilvawala, Qianhua Kan

Proceedings Volume 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering; 84090E (2012) https://doi.org/10.1117/12.920949
Event: Third International Conference on Smart Materials and Nanotechnology in Engineering, 2011, Shenzhen, China

Abstract

Bulk metallic glasses are a new type of advanced materials. They are characterized by their topologically disordered atomic structures. The lack of long-range translational symmetry in the atomic arrangement in bulk metallic glasses contributes to a range of unique and outstanding mechanical properties. For example, the yield strength of metallic glasses can be as large as twice that of corresponding crystalline alloys. However, the major issue to hinder metallic glasses application is the apparent brittleness. Unlike crystalline alloys, metallic glasses show abrupt failure with zero macroscopic plasticity. Various methods are being investigated in material engineering to improve the plasticity of bulk metallic glasses. The most recent progress is to develop shape memory bulk metallic glass composites, a combination of metallic glass and shape memory alloy. The large stress-induced transformation strain in shape memory alloy leads to the increase in the plasticity of the new composite material. The stress-strain behaviour of shape memory bulk metallic glass composites was investigated in this paper by using the finite element method. A unit cell model, which includes shape memory alloy phase and metallic glass phase, under uniaxial tension were numerically simulated. The effects of phase volume fraction, transformation stress and strain on the stress-strain behaviour of this new composite material were examined in this research.

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Wenyi Yan, Goseph Tilvawala, and Qianhua Kan "Numerical investigation of the mechanical behaviour of shape memory bulk metallic glass composites", Proc. SPIE 8409, Third International Conference on Smart Materials and Nanotechnology in Engineering, 84090E (2 April 2012); https://doi.org/10.1117/12.920949

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KEYWORDS

Composites

Glasses

Shape memory alloys

Particles

Crystals

Metals

Computer simulations

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