Journal
MATERIALS & DESIGN
Volume 116, Issue -, Pages 438-447Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.12.036
Keywords
High entropy alloys; Chromium; Titanium; Microstructure; Properties
Categories
Funding
- Natural Science Foundation of Hunan [2016JJ214]
- State Key Laboratory of Powder Metallurgy at Central South University [11100-410500063]
- Department of Energy (DOE), Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0024054]
- U.S. Army Research Office project [W911NF-13-1-0438]
- National Science Foundation Program [CMMI-11000, DMR-1611180]
- Cross-Cutting Technologies Program of NETL under the RES contract [DE-FE-0004000]
- [DE-FE-0011194]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1611180] Funding Source: National Science Foundation
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The equimolar AlCoCuFeNi-(Cr,Ti) high entropy alloys (HEAs) were synthesized by nonconsumable arc melting to investigate the effects of Cr and Ti on the mechanical and corrosion properties of HEAs. The results showed that as-cast AlCoCuFeNi-(Cr,Ti) HEM have a multi-phase microstructure, of which the solid-solution face-centered cubic (FCC), body-centered cubic (BCC) phases, and intermetallics can be observed. Ab initio molecular-dynamics (AIMD) simulations exhibit the existence of the preferred short-range ordering of Al-Ni, Co-Cr, Cr-Fe, and Ti-Co pairs in the AlCoCuFeNiCrTi liquid structure. The AIMD simulations are consistent with the experimental observation during solidification. The segregations and the FCC Cu-rich phase appear in the AlCoCuFeNiCrTi alloy, which is in agreement with AIMD calculations. The Cr addition to AlCoCuFeNi facilitates the formation of the BCC phases in the AlCoCuFeNiCr alloy, which can be explained by the larger SI and smaller delta values. The addition of large Ti atoms facilitates the formation of the FCC phase, which is due to the fact that Ti will easily induce the breakdown of the BCC solid-solution of the AlCoCuFeNi alloy in terms of decreasing the St value and increasing the delta value. The Cr addition improves the corrosion resistance of AlCoCuFeNi alloys. (C) 2016 Elsevier Ltd. All rights reserved.
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