Mechanisms for nucleation and propagation of incoherent twins in a CoCrFeNiMo 0.15 high-entropy alloy subject to cold rolling and annealing

In this paper, we report microstructure and mechanical properties evolution of the CoCrFeNiMn-type high entropy alloy, containing small amounts of Al and C, during cold rolling and subsequent annealing at 700-1100°C. In the initial as-cast condition the alloy has coarse-grained single face-centered cubic (fcc) phase structure. Cold rolling and annealing substantially refine fcc grains; in addition M23C6 type carbides appear. After annealing at relatively low temperatures (≤900°C), these particles are arranged in characteristic arrays aligned with rolling directions. The specific microstructure of the thermomechanically processed alloy is suggested to be the reason of the balanced combination of tensile strength and ductility.

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Fine tuning in-sync the mechanical and magnetic properties of FeCoNiAl0.25Mn0.25 high-entropy alloy through cold rolling and annealing treatment

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2020.116945 ◽

2021 ◽

Vol 289 ◽

pp. 116945

Author(s):

Tiwen Lu ◽

Tianbing He ◽

Panpan Zhao ◽

Kang Sun ◽

Angelo F. Andreoli ◽

...

Keyword(s):

Magnetic Properties ◽

Cold Rolling ◽

Annealing Treatment ◽

Fine Tuning ◽

High Entropy Alloy ◽

High Entropy ◽

Cold Rolling And Annealing

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The Effects of Annealing at Different Temperatures on Microstructure and Mechanical Properties of Cold-Rolled Al0.3CoCrFeNi High-Entropy Alloy

Metals ◽

10.3390/met11060940 ◽

2021 ◽

Vol 11 (6) ◽

pp. 940

Author(s):

Zichao Zhu ◽

Tongtong Yang ◽

Ruolan Shi ◽

Xuantong Quan ◽

Jinlong Zhang ◽

...

Keyword(s):

Mechanical Properties ◽

Cold Rolling ◽

Annealing Temperature ◽

Crystal Defects ◽

High Entropy Alloy ◽

Rolled Sample ◽

High Entropy ◽

Cold Rolling And Annealing ◽

Cold Rolled ◽

Strength And Toughness

In this work, cold-rolling was utilized to induce a high density of crystal defects in Al0.3CoCrFeNi high-entropy alloys. The effects of annealing temperature on static recrystallization, precipitation behavior and mechanical properties were investigated. With increasing annealing temperature from 590 °C to 800 °C, the area fraction of recrystallized region increases from 26.9% to 93.9%. Cold-rolling deformation largely promotes the precipitation of B2 phases during annealing, and the characteristics of the precipitates are linked to recrystallization level. The coarse and equiaxed B2 phases exist in the recrystallized region and the fine and elongated B2 phases occupy the non-recrystallized region. Combined use of cold-rolling and annealing can remarkably enhance the strength and toughness. A partially recrystallized microstructure in a cold-rolled sample annealed at 700 °C exhibits a better combination of strength and toughness than a fully recrystallized microstructure in a cold-rolled sample annealed at 800 °C. Finally, related mechanisms are discussed.

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Microstructural Evolution and Mechanical Properties of Al0.5CoCrFeNi High-Entropy Alloy after Cold Rolling and Annealing Treatments

Journal of Materials Engineering and Performance ◽

10.1007/s11665-021-05886-y ◽

2021 ◽

Author(s):

Armin Ghaderi ◽

Hossein Moghanni ◽

Kamran Dehghani

Keyword(s):

Mechanical Properties ◽

Cold Rolling ◽

Microstructural Evolution ◽

High Entropy Alloy ◽

High Entropy ◽

Cold Rolling And Annealing

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Microstructure and Mechanical Properties Evolution of the Al, C-Containing CoCrFeNiMn-Type High-Entropy Alloy during Cold Rolling

Materials ◽

10.3390/ma11010053 ◽

2017 ◽

Vol 11 (1) ◽

pp. 53 ◽

Cited By ~ 46

Author(s):

Margarita Klimova ◽

Nikita Stepanov ◽

Dmitry Shaysultanov ◽

Ruslan Chernichenko ◽

Nikita Yurchenko ◽

...

Keyword(s):

Mechanical Properties ◽

Cold Rolling ◽

High Entropy Alloy ◽

High Entropy ◽

Microstructure And Mechanical Properties

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Microstructure and Mechanical Properties of Equitomic CoCrFeCuNi High Entropy Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.765.149 ◽

2018 ◽

Vol 765 ◽

pp. 149-154 ◽

Cited By ~ 2

Author(s):

Seung Min Oh ◽

Sun Ig Hong

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

Cold Rolling ◽

Cast Alloy ◽

Cold Work ◽

High Entropy Alloy ◽

Second Phase ◽

Rich Phase ◽

High Entropy ◽

Microstructure And Mechanical Properties

Microstructure and mechanical properties of cast and cold-rolled equitomic CoCrFeCuNi alloy in which Mn was substituted by Cu from Cantor alloy was studied. The separation into two solid solutions (Cr-Co-Fe rich and Cu-rich phases) were observed in CoCrFeCuNi. Coarsening and widening of interdendritic Cu-rich phase after homogenization was observed after homogenization, suggesting Cu-rich phase is thermodynamically stable. The compressive stress-strain curves of homogenized cast CoCrFeCuNi alloy exhibited the reasonably high strength and excellent deformability for the cast alloy. The yield strength increased up to 960MPa after cold rolling from 265MPa of the homogenized cast alloy. The significant increase of yield strength is thought to be associated with the alignment of Cu-rich second phase in addition to cold work dislocation storage after cold rolling.

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