Grain boundary sliding with diffusional accommodation enable dynamic recrystallization during hot deformation of coarse-grained body-centered cubic HfNbTaTiZr high-entropy alloys

被引：4

作者：

Eleti, Rajeshwar R. ^{[1
]}

Allen, Brian ^{[2
]}

Martin, Brian ^{[2
]}

Sathiaraj, Dan ^{[3
]}

Kumar, Satheesh S. S. ^{[4
]}

机构：

[1] Indian Inst Technol Roorkee, Dept Met & Mat Engn, Roorkee, India

[2] Dynam Syst Inc, New York, NY USA

[3] Indian Inst Technol Indore, Dept Mech Engn, Indore, India

[4] Near Net Shape Grp, Def Met Res Lab, Hyderabad, India

来源：

SCRIPTA MATERIALIA | 2024年 / 238卷

关键词：

High-entropy alloys; Grain boundary sliding; Diffusional accommodation; Dynamic recrystallization; Necklace structure; BEHAVIOR; MICROSTRUCTURE; MECHANISMS;

D O I：

10.1016/j.scriptamat.2023.115778

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The origin of ultrafine grain refinement durig hot deformation of equiatomic HfNbTaTiZr body-centered cubic (BCC) high-entropy alloy (HEA), having an initial grain size, d -140 mu m is systematically investigated. Microstructural observation at very low strain (epsilon -0.04) interval showed unique saw-toothed and stair case-like ledges along the initial grain boundaries (GB). Further analyses showed triple junction folds, and shear offsets at the scratch line and GB intersections suggesting a grain boundary sliding (GBS) mechanism. This study shows direct evidence for the possibility of GBS mechanism in a coarse grained HfNbTaTiZr BCC-HEA, for the first time. The possibility of ultrafine grain refinement is discussed using GBS mechanism with diffusional accommodation. The present study featuring coarse grained GBS mechanism in HfNbTaTiZr alloy provided insights into the high energy GB structure of refractory BCC-HEAs.

引用

页数：6

共 5 条

[1] Body-centered cubic high-entropy alloys: From processing to underlying deformation mechanisms
Couzinie, J. -P.
Dirras, G.
MATERIALS CHARACTERIZATION, 2019, 147 : 533 - 544
[2] Unique high-temperature deformation dominated by grain boundary sliding in heterogeneous necklace structure formed by dynamic recrystallization in HfNbTaTiZr BCC refractory high entropy alloy
Eleti, Rajeshwar R.
Chokshi, Atul H.
Shibata, Akinobu
Tsuji, Nobuhiro
ACTA MATERIALIA, 2020, 183 : 64 - 77
[3] Mechanical behavior and thermal activation analysis of HfNbTaTiZr body-centered cubic high-entropy alloy during tensile deformation at 77 K
Eleti, Rajeshwar R.
Stepanov, Nikita
Zherebtsov, Sergey
SCRIPTA MATERIALIA, 2020, 188 : 118 - 123
[4] Plastic deformation of solid-solution strengthened Hf-Nb-Ta-Ti-Zr body-centered cubic medium/high-entropy alloys
Eleti, Rajeshwar R.
Stepanov, Nikita
Yurchenko, Nikita
Klimenko, Denis
Zherebtsov, Sergey
SCRIPTA MATERIALIA, 2021, 200
[5] Femtosecond laser sintering of irregular NbMoTaWZr powders to fabricate fine grain, single-phase body-centered cubic solid solution refractory high-entropy alloys
Zhang, Litian
Wang, Hao
Cheng, Wei
Kong, Lingchao
Liang, Xiubing
Ji, Lingfei
JOURNAL OF ALLOYS AND COMPOUNDS, 2023, 944

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