期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 847, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156555
关键词
Metal matrix composite (MMCs); TiB2 particles; Spark plasma sintering; Tensile properties; Strain hardening
资金
- Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia, Osaka University of the Special Budget Project of the Ministry of Education, Culture, Sports, Science, and Technology
The demand for using high-performance Cu matrix composites in the electronic industry has recently increased rapidly owing to the low strength and tribological properties of pure copper. Accordingly, research and development of composite processing and related properties have increased. In this study, the Cu matrix was reinforced with different amounts of TiB2 particles by mechanical alloying of elemental powders followed by consolidation employing spark plasma sintering (SPS) whereby high relative density (similar to 99%) and electric conductivity (similar to 83-88% IACS) were obtained. Tensile properties and deformation mechanisms of the composites were studied utilizing conventional and in-situ tensile tests with simultaneous FESEM and EBSD observations. In comparison with the reference pure copper, it was found that adding 0.5 wt%TiB2 results in significant ductility increment, which was consistent with the longer strain-softening behavior observed after necking. In addition, using in-situ microstructure characterization, twinning with slip bands were confirmed as deformation mechanisms. By increasing the amount of reinforcement to 5 wt%TiB2, strengthening was remarkable while sustaining a considerable elongation. The Hall-Petch and dislocation strengthening mechanisms were the key models of strengthening based on the calculations and microstructure characterizations since by increasing the TiB(2 )particles, significant grain refinement and dislocation density were shown. (C) 2020 Elsevier B.V. All rights reserved.
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