Strength–ductility balance in an ultrafine-grained non-equiatomic Fe50(CoCrMnNi)50 medium-entropy alloy with a fully recrystallized microstructure

Choi, Minku; Ondicho, Ibrahim; Park, Nokeun; Tsuji, Nobuhiro

doi:10.1016/j.jallcom.2018.11.265

Cited by 38 publications

(14 citation statements)

References 38 publications

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“…In our previous study of the Fe 50 (CoCrMnNi) 50 MEA system, a fully recrystallized specimen with ultrafine grain (UFG) size of 0.97 μm showed an impressive strengthductility balance [30]. However, the reason for this impressive synergy of strength and ductility could not be established.…”

Section: Introductionmentioning

confidence: 95%

Effect of Bimodal Grain Size Distribution on the Strain Hardening Behavior of a Medium-Entropy Alloy

Ondicho

Alunda²,

Madaraka

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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The evolution of strain hardening behavior of the Fe 50 (CoCrMnNi) 50 medium-entropy alloy as a function of the fraction of recrystallized microstructure and the grain size was studied using the Hollomon and Ludwigson equations. The specimens under study were partially recrystallized, fully recrystallized with ultrafine-grained microstructure, and fully recrystallized with coarse grains. The yield strength decreases steadily as the fraction of recrystallized microstructure and grain size increases due to the recovery process and the Hall-Petch effect. Interestingly, the bimodal grain distribution was found to have a significant impact on strain hardening during plastic deformation. For instance, the highest ultimate tensile strength was exhibited by a 0.97 μm specimen, which was observed to contain a bimodal grain distribution. Furthermore, using the Ludwigson equation, the effect of the bimodal grain distribution was established from the behavior of K 2 and n 1 curves. These curves tend to show very high values in the specimens with a bimodal grain distribution compared to those that show a homogenous grain distribution. Additionally, the bimodal grain distribution contributes to the extensive Lüders strain observed in the 0.97 μm specimen, which induces a significant deviation of the Hollomon equation at lower strains.

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Section: Introductionmentioning

confidence: 95%

Effect of Bimodal Grain Size Distribution on the Strain Hardening Behavior of a Medium-Entropy Alloy

Ondicho

Alunda²,

Madaraka

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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“…In this regard, design is no longer limited to high entropy but has developed toward medium entropy. With one main element accounting for approximately 50–70% of an alloy and the addition of other elements, the resultant structure can maintain a solid solution structure [ 9 , 10 ]. These developments have further expanded the range of alloy designs [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Novel Lightweight Al-Rich Quinary Medium-Entropy Alloys with High Strength and Ductility

et al. 2021

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Most high-entropy alloys and medium-entropy alloys (MEAs) possess outstanding mechanical properties. In this study, a series of lightweight nonequiatomic Al50–Ti–Cr–Mn–V MEAs with a dual phase were produced through arc melting and drop casting. These cast alloys were composed of body-centered cubic and face-centered cubic phases. The density of all investigated MEAs was less than 5 g/cm3 in order to meet energy and transportation industry requirements. The effect of each element on the microstructure evolution and mechanical properties of these MEAs was investigated. All the MEAs demonstrated outstanding compressive strength, with no fractures observed after a compressive strain of 20%. Following the fine-tuning of the alloy composition, the Al50Ti20Cr10Mn15V5 MEA exhibited the most compressive strength (~1800 MPa) and ductility (~34%). A significant improvement in the mechanical compressive properties was achieved (strength of ~2000 MPa, strain of ~40%) after annealing (at 1000 °C for 0.5 h) and oil-quenching. With its extremely high specific compressive strength (452 MPa·g/cm3) and ductility, the lightweight Al50Ti20Cr10Mn15V5 MEA demonstrates good potential for energy or transportation applications in the future.

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“…This concept not only provided flexibility of HEA design but also contrasted the existing HEA design concepts. Numerous alloy combinations were created and the microstructures of selected alloys revealed a single phase [9][10][11]. When there is one element with high atomic percentage and the other elements have equal atomic percentage, the calculated configurational entropies of the alloys were changed from high-entropy to medium-entropy areas [12].…”

Section: Introductionmentioning

confidence: 99%

Development of Novel Lightweight Dual-Phase Al-Ti-Cr-Mn-V Medium-Entropy Alloys with High Strength and Ductility

Liao

Chen

et al. 2020

Entropy

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A novel lightweight Al-Ti-Cr-Mn-V medium-entropy alloy (MEA) system was developed using a nonequiatiomic approach and alloys were produced through arc melting and drop casting. These alloys comprised a body-centered cubic (BCC) and face-centered cubic (FCC) dual phase with a density of approximately 4.5 g/cm3. However, the fraction of the BCC phase and morphology of the FCC phase can be controlled by incorporating other elements. The results of compression tests indicated that these Al-Ti-Cr-Mn-V alloys exhibited a prominent compression strength (~1940 MPa) and ductility (~30%). Moreover, homogenized samples maintained a high compression strength of 1900 MPa and similar ductility (30%). Due to the high specific compressive strength (0.433 GPa·g/cm3) and excellent combination of strength and ductility, the cast lightweight Al-Ti-Cr-Mn-V MEAs are a promising alloy system for application in transportation and energy industries.

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Strength–ductility balance in an ultrafine-grained non-equiatomic Fe50(CoCrMnNi)50 medium-entropy alloy with a fully recrystallized microstructure

Cited by 38 publications

References 38 publications

Effect of Bimodal Grain Size Distribution on the Strain Hardening Behavior of a Medium-Entropy Alloy

Effect of Bimodal Grain Size Distribution on the Strain Hardening Behavior of a Medium-Entropy Alloy

Development of Novel Lightweight Al-Rich Quinary Medium-Entropy Alloys with High Strength and Ductility

Development of Novel Lightweight Dual-Phase Al-Ti-Cr-Mn-V Medium-Entropy Alloys with High Strength and Ductility

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