Roles of In-Situ Forming Hard Particles in a Zr-Based Bulk-Metallic Glass during Monotonic and Cyclic Loading |
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| Authors: | GY Wang PK Liaw Y Yokoyama L Huang T Zhang and A Inoue |
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| Affiliation: | (1) Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;(2) Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;(3) Department of Materials Science and Engineering, Beijing University of Aeronaut & Astronaut, Beijing, 100083, People’s Republic of China |
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| Abstract: | Zr67Ni20Cu5Al8 (in at. pct) is a bulk-metallic glass (BMG) with in-situ forming hard particles. Some crystalline particles can be observed in the polished beam samples under optical microscopy
(OM). The hardness measurements show that these crystalline particles are harder than the matrix of Zr67Ni20Cu5Al8. The energy-dispersive spectroscopy (EDS) analyses demonstrate that there is little difference in the compositions between
the crystalline particles and the matrix. The Zr67Ni20Cu5Al8 BMG under compressive loading exhibits yield strength of 1580 MPa with an up to 7.7 pct fracture strain. The fatigue behavior
of Zr67Ni20Cu5Al8 is investigated under four-point-bending loading. The fatigue results show that the fatigue limit of Zr67Ni20Cu5Al8 is approximately 361 MPa, based on the stress range. It is generally found that the fatigue cracks initiate from the hard
particles. The influence of the hard inclusions on the fracture and fatigue behavior of Zr-based BMGs is discussed. |
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