Effect of Al, Ti and C additions on Widmanstatten microstructures and mechanical properties of cast Al0.6CoCrFeNi compositionally complex alloys

被引:36
作者
Asabre, A. [1 ]
Kostka, A. [2 ]
Stryzhyboroda, O. [3 ]
Pfetzing-Micklich, J. [2 ]
Hecht, U. [3 ]
Laplanche, G. [1 ]
机构
[1] Ruhr Univ Bochum, Inst Werkstoffe, D-44801 Bochum, Germany
[2] Ruhr Univ Bochum, ZGH, Bochum, Germany
[3] ACCESS eV, Intzestr 5, D-52072 Aachen, Germany
关键词
High-entropy alloys; Microalloying; Microstructural refinement; Grain boundary sliding; Tensile properties; Fracture surfaces; HIGH-ENTROPY ALLOYS; LASER METAL-DEPOSITION; TEMPERATURE-DEPENDENCE; CONCENTRATED ALLOYS; TENSILE PROPERTIES; PHASE-STABILITY; ELASTIC-MODULI; DEFORMATION; BEHAVIOR; COEFFICIENTS;
D O I
10.1016/j.matdes.2019.108201
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The cast microstructure of the Al0.6CoCrFeNi compositionally complex alloy was successfully refined with small additions of Al, Ti and C and its mechanical properties were optimized. In the as-cast state, this alloy has a Widmanstatten microstructure with coarse grains (similar to 110 mu m) of a strong BCC/B2 matrix and soft FCC plates (similar to 65 vol.%) with large widths (similar to 1.3 mu m). The addition of 0.25 at.% C to Al0.6CoCrFeNi stabilizes the FCC phase and favors the formation of a coarse dendritic microstructure making this alloy unsuitable for structural applications. In contrast, alloying of either 3 at.% Al, Ti, or 3% Ti and 0.25% C to Al0.6CoCrFeNi refined its Widmanstatten microstructure, i.e. the thickness of the FCC plates and/or the size of the prior BCC/B2 grains were significantly reduced. As a result of these microstructural changes, Al and Ti containing alloys show an outstanding strength (twice higher than that of Al0.6CoCrFeNi) and ductilities <= 5% at 20 degrees C. These properties are retained at 400 degrees C but at 700 degrees C, the strength and ductility of almost all alloys decrease. However, Ti containing alloys exhibit much larger ductilities (similar to 50%) at 700 degrees C due to their high density of grain boundaries which accommodate plastic deformation through grain boundary sliding. (C) 2019 The Authors. Published by Elsevier Ltd.
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页数:15
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