Softening caused by profuse shear banding in a bulk metallic glass |
| |
Authors: | Bei H Xie S George E P |
| |
Affiliation: | Department of Materials Science and Engineering, The University of Tennessee, Knoxville, 37996, USA. |
| |
Abstract: | By controlling the specimen aspect ratio and strain rate, compressive strains as high as 80% were obtained in an otherwise brittle metallic glass. Physical and mechanical properties were measured after deformation, and a systematic strain-induced softening was observed which contrasts sharply with the hardening typically observed in crystalline metals. If the deformed glass is treated as a composite of hard amorphous grains surrounded by soft shear-band boundaries, analogous to nanocrystalline materials that exhibit inverse Hall-Petch behavior, the correct functional form for the dependence of hardness on shear-band spacing is obtained. Deformation-induced softening leads naturally to shear localization and brittle fracture. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|