Abstract
A novel aluminum matrix composites (AMCs) reinforced by multiphase intermetallic compounds were fabricated through a conventional casting approach. The microstructure, compression properties and tribological behavior of the AMCs were detailed studied by the scanning electron microscope (SEM), x-ray diffraction (XRD), and electron probe microanalysis (EPMA). The results demonstrated that the fraction of precipitated multiphase intermetallic compounds gradually increased with the increase of high-entropy alloy (HEA) adding content, and the grain size of α-Al obviously was reduced. The irregular multiphase intermetallic compounds, such as Al70Cr20Ni10 and AlTiCrSi, are distributed in the Al matrix. However, the Al2Cu and Al7Cu4Ni distributed in inter-dendrites of α-Al. In addition, the compression strength of AMCs reinforced by 20.0 wt.% HEA addition was significantly enhanced to 530 MPa due to the precipitation of multiphase intermetallic compounds. Meanwhile, its compression strain was higher than 25%. Compared with pure Al, the microhardness of AMCs was extremely increased to 160 HV when the addition content of HEA was up to 20.0 wt.%. When the addition amount of HEA reached 10.0 wt.%, the COF of the ACMs was decreased by 51.6% from 0.766 to 0.371. When the HEA content was up to 20.0 wt.%, the wear rate reached the minimum of 4.87 × 10−5 mm3/N·m, which was reduced by 31.9% compared with pure Al. Furthermore, the strengthening effect and wear mechanism of AMCs reinforced by HEA addition was also discussed.
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Acknowledgments
This work financially supports of the National Natural Science Foundation of China (Grant Nos. 52061026; 51561021), the State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology (SKLAB02019007), Key Research and Development Program of Gansu Province (21YF5GA075) and Outstanding Graduate Student “Innovation Star” Project of Gansu (2021CXZX-428, 2021CXZX-435).
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Li, Q., Qiao, Z., Bao, X. et al. Effect of Intermetallic Compounds on the Microstructure, Mechanical Properties, and Tribological Behaviors of Pure Aluminum by Adding High-Entropy Alloy. J. of Materi Eng and Perform 31, 6697–6710 (2022). https://doi.org/10.1007/s11665-022-06697-5
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DOI: https://doi.org/10.1007/s11665-022-06697-5