Journal
SCRIPTA MATERIALIA
Volume 114, Issue -, Pages 31-34Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.11.032
Keywords
High-entropy alloy; Nanotwin; K-S crystallographic relationship; Growth direction; Nanoindentation
Categories
Funding
- National Science Foundation of China [51271161, 51171163, 51121061]
- Specialized Research Fund for the Doctoral Program of Higher Education [20131333110019]
- U.S. Army Research Office project [W911NF-13-1-0438]
- National Science Foundation [CMMZ-1100080]
- Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0011194, DE-FE-0024054]
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Nanotwins were formed in the AlCoCuFeNi high-entropy alloy produced by melt-spinning. The Cu-rich nanotwins have a face-centered-cubic (FCC) structure diffused in the ordered body-centered-cubic (B2) matrix. The nanotwins decompose from the matrix with the K-S crystallographic relationship: {111}(FCC) parallel to (110}(B2) and < 110 >(FCC) parallel to < 111 > B-2. After annealing, the spherical nanotwins grow into rodlike grains. The growth direction is parallel to the {111} twin planes of the FCC phase. The hardness and elastic modulus change with the twin size, which is tested by nanoindentation. This study deepens the fundamental understanding of the phase transition in HEAs. (C) 2015 Elsevier Ltd. All rights reserved.
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