A TRIP-assisted dual-phase high-entropy alloy: Grain size and phase fraction effects on deformation behavior

被引：576

作者：

Li, Zhiming ^{[1
]}

Tasan, Cemal Cem ^{[2
]}

Pradeep, Konda Gokuldoss ^{[1
,3
]}

Raabe, Dierk ^{[1
]}

机构：

[1] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[2] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[3] Rhein Westfal TH Aachen, Mat Chem, Kopernikusstr 10, D-52074 Aachen, Germany

来源：

ACTA MATERIALIA | 2017年 / 131卷

基金：

欧洲研究理事会;

关键词：

High-entropy alloy; Dual phase; Phase transformations; Grain refining; Mechanical properties; ATOM-PROBE TOMOGRAPHY; MECHANICAL-PROPERTIES; HIGH-STRENGTH; SINGLE-PHASE; AUSTENITE; TRANSFORMATION; DESIGN; STEEL; SCALE; DISLOCATION;

D O I：

10.1016/j.actamat.2017.03.069

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a systematic microstructure oriented mechanical property investigation for a newly developed class of transformation-induced plasticity-assisted dual-phase high-entropy alloys (TRIP-DP-HEAs) with varying grain sizes and phase fractions. The DP-HEAs in both, as-homogenized and recrystallized states consist of a face-centered cubic (FCC) matrix containing a high-density of stacking faults and a laminate hexagonal close-packed (HCP) phase. No elemental segregation was observed in grain interiors or at interfaces even down to near-atomic resolution, as confirmed by energy-dispersive X-ray spectroscopy and atom probe tomography. The strength-ductility combinations of the recrystallized DP-HEAs (Fe50Mn30Co10Cr10) with varying FCC grain sizes and HCP phase fractions prior to deformation are superior to those of the recrystallized equiatomic single-phase Cantor reference HEA (Fe20Mn20Ni20-Co20Cr20). The multiple deformation micro-mechanisms (including strain-induced transformation from FCC to HCP phase) and dynamic strain partitioning behavior among the two phases are revealed in detail. Both, strength and ductility of the DP-HEAs increase with decreasing the average FCC matrix grain size and increasing the HCP phase fraction prior to loading (in the range of 10-35%) due to the resulting enhanced stability of the FCC matrix. These insights are used to project some future directions for designing advanced TRIP-HEAs through the adjustment of the matrix phase's stability by alloy tuning and grain size effects. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：323 / 335

页数：13

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