Effect of MoSi 2 Content on Dry Sliding Tribological Properties of Zr-Based Bulk Metallic Glass Composites
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JMEPEG (2017) 26:6219–6225 https://doi.org/10.1007/s11665-017-3039-2
Effect of MoSi2 Content on Dry Sliding Tribological Properties of Zr-Based Bulk Metallic Glass Composites Longfei Liu and Jun Yang (Submitted December 28, 2016; in revised form August 29, 2017; published online November 28, 2017) Zr55Cu30Al10Ni5 bulk metallic glass and its composites were prepared by suction casting into a copper mold. The effect of MoSi2 content on the tribological behavior of Zr55Cu30Al10Ni5 BMG was studied by using a high-speed reciprocating friction and wear tester. The results indicate that the friction coefficient and wear resistance of the BMGs can be improved by a certain amount of crystalline phase induced by MoSi2 content from 1 to 3% and deteriorated with MoSi2 content of 4%. The wear mechanism of both the metallic glass and its composite is abrasive wear. The mechanism of crystalline phase-dependent tribological properties of the composite was discussed based on the wear track and mechanical properties in the present work. The wear behavior of Zr55Cu30Al10Ni5 BMG and its composite indicates that a good combination of the toughness and the hardness can make the composite be well wear resistant. Keywords
abrasive wear, hardness, metallic glass, SEM-EDS, wear mechanism
1. Introduction Bulk metallic glasses (BMGs) have unique physical, mechanical, and chemical properties due to their long-range disorder atomic structure. The preparation and mechanical behavior of BMGs have been intensively studied because of basic science and potential engineering application (Ref 1-3). However, most monolithic BMGs are prone to fracture with little plasticity during unconstrained loading, which severely limits their applications as an engineering material (Ref 4). This problem has been improved by the formation of fine secondphase or in-situ dendrite of BMG (Ref 5-9). As for BMG composites, the formation of second-phase particles/dendrite can effectively block the propagation of shear bands formed in the brittle amorphous matrix (Ref 10-12). Therefore, BMG composites have better mechanical properties than that of monolithic BMGs, such as plasticity and toughness. Superior tribological properties are also expected from the combination of high hardness and toughness of BMG-matrix composites. In addition, there were contradictory reports on the effect of crystalline phase on wear resistance of BMG composites. Gloriant reports a positive effect of the crystalline phase on wear resistance (Ref 13), while others show a negative effect (Ref 14). Several reports demonstrated that the tribological properties of BMG composites are dependent on the amount of second-phase/dendrite (Ref 13-16). An appropriate amount of second-phase/dendrite in the BMG matrix can increase the wear resistance of BMG composites. The wear performance of BMG composites with an excessive fraction of second-phase/dendrite
Longfei Liu and Jun Yang, School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201 Hunan, Peoples Republi
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