Fine tuning of tensile properties in CrCoNi medium entropy alloy through cold rolling and annealing

被引：69
作者：
Sathiyamoorthi, Praveen [1 ,2 ]
Asghari-Rad, Peyman [1 ,2 ]
Bae, Jae Wung [1 ,2 ]
Kim, Hyoung Seop [3 ]
机构：
[1] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 37673, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Ctr High Entropy Alloys, Pohang 37673, South Korea
[3] Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea
来源：
INTERMETALLICS | 2019年 / 113卷
基金：
新加坡国家研究基金会;
关键词：
Partial recrystallization; Tensile properties; Medium entropy alloy; Deformation twins; Thermo-mechanical processing; HIGH-PRESSURE TORSION; CU-AL ALLOYS; EQUIATOMIC MEDIUM; HIGH-STRENGTH; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; PLASTIC-DEFORMATION; MICROSTRUCTURE; DUCTILITY; RECRYSTALLIZATION;
D O I：
10.1016/j.intermet.2019.106578
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present study, tensile properties of CrCoNi medium entropy alloy with different microstructures (recovery, partial recrystallization, recrystallization) were investigated by subjecting cold-rolled samples to different annealing conditions. The microstructure of the cold-rolled sample showed the presence of severely deformed grains with several deformation twins. Annealing of the cold-rolled samples at 700 degrees C and above for 60 min led to fully recrystallized microstructure, while annealing at temperatures lower than 700 degrees C led to recovery and partially recrystallized microstructures. The annealed samples showed a typical strength-ductility trade-off with an increasing fraction of recrystallized grains and increasing average grain size in samples with partially recrystallized and fully recrystallized microstructure, respectively. Fine tuning of microstructure led to a remarkable combination of strength (similar to 1 GPa) and uniform elongation (28%) in the sample with partially recrystallized microstructure, which consists of similar to 77% of recrystallized grains with an average recrystallized grain size of similar to 3 mu m.
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页数：6
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