Wear behavior of Al 0.6 CoCrFeNi high-entropy alloys: Effect of environments
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ARTICLE Wear behavior of Al0.6CoCrFeNi high-entropy alloys: Effect of environments Ming Chen and Xiao Hui Shi Lab of High-entropy Alloys, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Huijun Yanga) Lab of High-entropy Alloys, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Peter K. Liawc) Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996-2200, USA
Michael C. Gaoc) National Energy Technology Laboratory, Albany, Oregon 97321, USA; and AECOM, Albany, Oregon 97321, USA
Jeffrey A. Hawk National Energy Technology Laboratory, Albany, Oregon 97321, USA
Junwei Qiaob) Lab of High-entropy Alloys, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China (Received 13 March 2018; accepted 16 July 2018)
Environment can impact the wear behavior of metals and alloys substantially. The tribological properties of Al0.6CoCrFeNi high-entropy alloys (HEAs) were investigated in ambient air, deionized water, simulated acid rain, and simulated seawater conditions at frequencies of 2–5 Hz. The as-cast alloy was composed of simple face-centered cubic and body-centered cubic phases. The wear rate of the as-cast HEA in the ambient air condition was significantly higher than that in the liquid environment. The wear resistance in seawater was superior to that in ambient air, deionized water, and acid rain. Both the friction coefficient and wear rate in seawater were the lowest due to the formation of oxidation film, lubrication, and corrosion action in solution. The dominant wear mechanism in the ambient air condition and deionized water was abrasive wear, delamination wear, and oxidative wear. By contrast, the wear mechanism in acid rain and seawater was mainly corrosion wear, adhesive wear, abrasive wear, and oxidative wear.
I. INTRODUCTION
For hundreds of years, most of structural metallic materials, such as steels and aluminum alloys, have been mainly based on one principal element as the matrix with the addition of other minor elements for property/processing enhancement, thereby vastly limiting the number of applicable alloy systems and development of new materials. A novel class of alloys designated as highentropy alloys (HEAs) was posited since 1995.1–4 Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] c) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs. org/editor-manuscripts/. DOI: 10.1557/jmr.2018.279 J. Mater. Res.,
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