Journal
INTERMETALLICS
Volume 54, Issue -, Pages 104-109Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2014.05.018
Keywords
Fracture mode; Casting; Microstructure; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51101110, 51371122, 11390362, 51341006]
- Shanxi Scholarship Council of China [2012-032]
- Program for the outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Top Young Academic Leaders of Shanxi and the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- State Key Lab of Advanced Metals and Materials [2013-Z03]
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The crystallographic orientation, tensile behavior, fracture mechanism, hardness, and elastic modulus of a single-crystal CoCrFeNiAl0.3 high-entropy alloy (HEA) successfully synthesized by Bridgman solidification are investigated in detail. The growth direction of the single-crystal product mainly focuses on the < 001 > orientation. An ultimate tensile elongation of about 80% is achieved in the single-crystal alloy, accompanied by a large work-hardening exponent and a shear-fracture mode. A quantitative Hall Petch relationship for the current HEA can be obtained as sigma(y) = 171.65 + 0.73/root d. The single-crystal sample displays a relatively-lower elastic modulus than the as-cast counterpart, indicating the anisotropy of elastic modulus. The outstanding tensile ductility for the single-crystal product is attributed to (1) low-angle grain boundaries and thus less distance to dislocation motion; and (2) single < 001 > crystallographic orientation and therefore less plastic-strain incompatibility. (C) 2014 Elsevier Ltd. All rights reserved.
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