Design of a twinning-induced plasticity high entropy alloy

被引：697
作者：
Deng, Y. [1 ,2 ]
Tasan, C. C. [1 ]
Pradeep, K. G. [1 ,3 ]
Springer, H. [1 ]
Kostka, A. [1 ]
Raabe, D. [1 ]
机构：
[1] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany
[2] Norwegian Univ Sci & Technol, Dept Engn Design & Mat, NO-7491 Trondheim, Norway
[3] Rhein Westfal TH Aachen, Mat Chem, D-52074 Aachen, Germany
来源：
ACTA MATERIALIA | 2015年 / 94卷
基金：
欧洲研究理事会;
关键词：
High entropy alloy; ECCI; EBSD; Lean; Twinning; ATOM-PROBE TOMOGRAPHY; PHASE-STABILITY; MECHANICAL-PROPERTIES; HIGH-STRENGTH; MULTICOMPONENT; SEGREGATION; DEFORMATION; BEHAVIOR; AUSTENITE; EVOLUTION;
D O I：
10.1016/j.actamat.2015.04.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We introduce a liquid metallurgy synthesized, non-equiatomic Fe40Mn40Co10Cr10 high entropy alloy that is designed to undergo mechanically-induced twinning upon deformation at room temperature. Microstructure characterization, carried out using SEM, TEM and APT shows a homogeneous fcc structured single phase solid solution in the as-cast, hot-rolled and homogenized states. Investigations of the deformation substructures at specific strain levels with electron channeling contrast imaging (ECCI) combined with EBSD reveal a clear change in the deformation mechanisms of the designed alloy starting from dislocation slip to twinning as a function of strain. Such twinning induced plasticity has only been observed under cryogenic conditions in the equiatomic FeMnNiCoCr high entropy alloy. Thus, despite the decreased contribution of solid solution strengthening, the tensile properties of the introduced lean alloy at room temperature are found to be comparable to that of the well-studied five component FeMnNiCoCr system. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：124 / 133
页数：10
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