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Microstructure and tensile behavior of small scale resistance spot welding of sandwich bulk metallic glasses
S.F. Guoa, b, K.C. Chanc, Z.Q. Zhud, Z.R. Wue, W. Chenf, M. Songg
b State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
c Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, China
d School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China
e Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
f Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT 06511, USA
g Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
Abstract
In this work, a small-scale resistance spot welding method was utilized to join two dissimilar Zr-based bulk metallic glasses and to fabricate the sandwich-laminated metallic glass plates. The laminates exhibit an almost fully amorphous structure without undesirable crystallization. Elemental line scanning across the joint interface shows a uniform distribution of the main elements, demonstrating favorable metallurgical bond in the laminate. The resultant tensile strength of the welded laminate is comparable to that of the parent metallic glasses. The fractured surface of the laminate exhibits extensive multiple failure planes, suggesting that the fracture instability was mediated by a crack branching mechanism over across the joint interface. Such a crack branching mechanism results in a stepwise fracture behavior which is contrastingly different from the conventional single primary shear band dominated catastrophic fracture in monolithic metallic glasses under tension. The unique stepwise fracture behavior endows the sandwiched metallic glass laminates with an excessive strain energy absorption through the joint interface than monolithic metallic glasses. Our results demonstrate that small-scale resistance spot welding is a promising approach to scaling up metallic glasses and to fabricating metallic glass laminates with desirable mechanical performance for structural applications.
Keywords
Metallic glasses; Tensile behavior; Microstructure; Laminate
http://www.sciencedirect.com/science/article/pii/S0022309316302423
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