On the formation of hierarchical microstructure in a Mo-doped NiCoCr medium-entropy alloy with enhanced strength-ductility synergy

被引：103

作者：

He, Junyang ^{[1
]}

Makineni, Surendra Kumar ^{[1
]}

Lu, Wenjun ^{[1
]}

Shang, Yuanyuan ^{[2
]}

Lu, Zhaoping ^{[2
]}

Li, Zhiming ^{[1
]}

Gault, Baptiste ^{[1
,3
]}

机构：

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

[2] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[3] Imperial Coll London, Royal Sch Mines, Dept Mat, Prince Consort Rd, London SW7 2BP, England

来源：

SCRIPTA MATERIALIA | 2020年 / 175卷

关键词：

Medium entropy alloys; Hierarchical microstructure; Partial recrystallization; Yield strength; Deformation twinning; PRECIPITATION; DEFORMATION; DEPENDENCE; EVOLUTION; BEHAVIOR; DESIGN; PHASES;

D O I：

10.1016/j.scriptamat.2019.08.036

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We demonstrate the formation of a hierarchical microstructure by optimized combination of Mo-doping and thermo-mechanical processing in a NiCoCr medium-entropy-alloy (MEA) that results in a significant improvement in yield-strength (similar to 775 MPa) and ultimate-tensile-strength (similar to 1200 MPa) with an elongation to fracture up to 35%. Addition of Mo slows down the recrystallization kinetics of the cold-rolled alloy at 700 degrees C. After 4 h annealing, the microstructure comprises soft recrystallized and hard non-recrystallized zones, dispersed sigma precipitates, annealing twins and retained stacking faults/nanotwins that are shown to contribute to the overall mechanical behavior. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1 / 6

页数：6

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