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Effect of Intermetallic Compounds on the Microstructure, Mechanical Properties, and Tribological Behaviors of Pure Aluminum by Adding High-Entropy Alloy.

Authors :
Li, Qinglin
Qiao, Zhaobo
Bao, Xuepeng
Fan, Chenglong
Lan, Yefeng
Ma, JiQiang
Source :
Journal of Materials Engineering & Performance; Aug2022, Vol. 31 Issue 8, p6697-6710, 14p
Publication Year :
2022

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 Al<subscript>70</subscript>Cr<subscript>20</subscript>Ni<subscript>10</subscript> and AlTiCrSi, are distributed in the Al matrix. However, the Al<subscript>2</subscript>Cu and Al<subscript>7</subscript>Cu<subscript>4</subscript>Ni 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<superscript>−5</superscript> mm<superscript>3</superscript>/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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10599495
Volume :
31
Issue :
8
Database :
Complementary Index
Journal :
Journal of Materials Engineering & Performance
Publication Type :
Academic Journal
Accession number :
158654567
Full Text :
https://doi.org/10.1007/s11665-022-06697-5