Extremely hard, α-Mn type high entropy alloy coatings. (15th March 2020)

• Record Type: Journal Article
• Authors: Sha, Chuhan; Zhou, Zhifeng; Xie, Zonghan; Munroe, Paul
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 477
• Page End: 482
• Publication Date: 2020-03-15
• Subjects: High entropy alloy coatings -- Mechanical properties -- Texture -- Twin boundaries -- α-Mn; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.12.029
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: FeMnCoCrC high entropy alloy coatings were deposited onto high speed steel substrates using magnetron sputtering under a range of substrate bias voltages. These coatings exhibited a novel α-Mn crystal structure and highly refined columnar grains. Higher bias voltages promoted strong texture development through favouring (332)-oriented grains along the coating growth direction, as well as the formation of well-defined twin boundaries. The -80 V coating possessed a high hardness (~12.5 GPa), more than triple that of its fcc-structured bulk counterpart. This is attributed to the cumulative effects of the α-Mn structure, strong texture, grain refinement and the presence of twin boundaries. Graphical abstract: Image, graphical abstract