Fiber metallic glass laminates
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P. Cheung, J.T. Fan, and J. Lua) Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, People’s Republic of China
W.H. Wangb) Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China (Received 2 December 2009; accepted 4 January 2010)
The fabrication and properties of fiber metallic glass laminates (FMGL) composite composed of Al-based metallic glasses ribbons and fiber/epoxy layers were reported. The metallic glass composite possesses structural features of low density and high specific strength compared to Al-based metallic glass and crystalline Al alloys. The material shows pronounced tensile ductility compared to monolithic bulk metallic glasses.
I. INTRODUCTION
The design of modern high-performance structural engineering materials is driven by optimizing combinations of mechanical properties such as strength, ductility, toughness, and elasticity.1 Composites, by incorporating two or more phases in a material, often possess unique properties that are not attainable by either of the constituents acting alone.2 Metallic glasses, as a new class of materials, have unique mechanical properties compared to their crystalline counterparts.3–5 However, their applicability as structural materials is limited by their glassforming ability (GFA) and poor ductility. At room temperature, bulk metallic glasses (BMGs) often deform inhomogeneously with severe plastic strains localized in narrow shear bands that propagate fast to cause catastrophic failure, which often makes them exhibit limited compressive plasticity and near-zero tensile ductility.6–8 The natural way to improve the plasticity of BMGs is to fabricate BMG composites by in/ex situ introducing crystalline phases into the glass matrix.9,10 Carbon has been found to be effective for improving the mechanical and physical properties of BMGs.11,12 It is reported that significant tensile ductility and good fatigue resistance can be achieved by delicately adjusting the microstructure length scales in BMG composites.13 While the strategy requires that the BMGs used have good GFA and high processibility during casting, only limited compositions are available. Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/JMR.2010.0291 J. Mater. Res., Vol. 25, No. 12, Dec 2010
Fiber metal laminates (FML), as a family of new hybrid composites, consist of bonded thin metal sheets (e.g., Al alloys) and fiber/adhesive layers.14 This laminated structure, which provides material with excellent fatigue, impact, and damage tolerance characteristics and a low density, has been widely used as aircraft structures.14–16 In this work, we report the formation of fiber metallic glass laminates (FMGL) composite, which is composed of Al-based metallic glass layers and carbon fiber/epoxy layers. The composite exhibits high tensile strength up to 760 MPa and low density, which grant it higher specific strength and good ductility both under tensile and bending co
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