The Duality of Fracture Behavior in a Ca-based Bulk-Metallic Glass |
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| Authors: | Gongyao Wang Peter K. Liaw Oleg N. Senkov Daniel B. Miracle |
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| Affiliation: | (1) Department of Material Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;(2) Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson Air Force Base, Dayton, OH 45433, USA |
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| Abstract: | Ca65Mg15Zn20 bulk-metallic glass (BMG) exhibited a typical brittle fracture behavior during compressive loading at room temperature. Samples exploded into many small pieces after elastic deformation and no macroscopic plasticity was observed. The fracture surface demonstrated multiple fracture patterns, including typical metallic-glass vein patterns and glass mirror, mist, and hackle patterns. These observations show that Ca-based BMGs are subjected to multiple brittle fracture modes under compressive loading. Periodic nanoscale corrugations were found in the hackle region, which may indicate local plasticity for the brittle fracture. |
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