Authors: Ning Li Wen Chen Lin Liu
Publish Date: 2016/02/18
Volume: 68, Issue: 4, Pages: 1246-1261
Abstract
Bulk metallic glasses are a fascinating class of metallic alloys with an isotropic amorphous structure that is rapidly quenched from liquid melts The absence of a crystalline microstructure endows them with a portfolio of properties such as high strength high elasticity and excellent corrosion resistance Whereas the limited plasticity and hence poor workability at ambient temperature impede the structural application of bulk metallic glasses the unique superplasticity within the supercooled liquid region opens an alternative window of socalled thermoplastic forming which allows precise and versatile netshaping of complex geometries on length scales ranging from nanometers to centimeters that were previously unachievable with conventional crystalline metal processing Thermoplastic forming not only breaks through the bottleneck of the manufacture of bulk metallic glasses at ambient temperature but also offers an alluring prospect in microengineering applications This paper comprehensively reviews some pivotal aspects of bulk metallic glasses during thermoplastic microforming including an indepth understanding of the crystallization kinetics of bulk metallic glasses and the thermoplastic processing time window the thermoplastic forming map that clarifies the relationship between the flow characteristics and the formability the interfacial friction in microforming and novel forming methods to improve the formability and the potential applications of the hotembossed micropatterns/componentsThis work was financially supported by the National Natural Science Foundation of China under Grant No 51005081 The authors would like to thank all the group members for their contributions to this work The authors are grateful to the Analytical and Testing Center Huazhong University of Science and Technology for technical assistance
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