Boundary micro-cracking in metastable Fe45Mn35Co10Cr10 high-entropy alloys

Wei, Shaolou; Kim, Jinwoo; Taşan, Cemal Cem

doi:10.1016/j.actamat.2019.01.036

Cited by 82 publications

(23 citation statements)

References 44 publications

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“…Recently, Wei et al . showed volumetric contraction associated with martensitic transformation in metastable Fe 45 Mn 35 Co 10 Cr 10 HEA 31 . The present HEAs show negative ΔV, indicating volumetric contraction.…”

Section: Resultsmentioning

confidence: 99%

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

Sinha

Nene

Frank

et al. 2019

Sci Rep

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Activation of different slip systems in hexagonal close packed (h.c.p.) metals depends primarily on the c/a ratio, which is an intrinsic property that can be altered through alloying addition. In conventional h.c.p. alloys where there is no diffusion-less phase transformation and associated transformation volume change with deformation, the c/a ratio remains constant during deformation. In the present study, c/a ratio and transformation volume change of h.c.p. epsilon martensite phase in transformative high entropy alloys (HEAs) were quantified as functions of alloy chemistry, friction stir processing and tensile deformation. The study revealed that while intrinsic c/a is dependent on alloying elements, c/a of epsilon in transformative HEAs changes with processing and deformation. This is attributed to transformation volume change induced dependence of h.c.p. lattice parameters on microstructure and stress state. Lower than ideal c/a ratio promotes non-basal pyramidal 〈c + a〉 slip and deformation twinning in epsilon phase of transformative HEAs. Also, a unique twin-bridging mechanism was observed, which provided experimental evidence supporting existing theoretical predictions; i.e., geometrical factors combined with grain orientation, c/a ratio and plastic deformation can result in characteristic twin boundary inclination at 45–50°.

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Section: Resultsmentioning

confidence: 99%

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

Sinha

Nene

Frank

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Therefore, FCC-HCP martensitic transformation has been widely investigated in the HEAs field to harness the benefits of the TRIP effect. [11][12][13][14][15][16][17] The FCC-HCP martensitic transformation generally plays a crucial role for the failure. Specifically, the HCP martensite acts as a preferential site for crack or void initiation, which deteriorates the ductility.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth at Different Frequencies and Temperatures in an Fe-based Metastable High-entropy Alloy

2021

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“…Despite some ongoing arguments regarding the origins (as well as the existence) of their special properties [3], the mentioned core idea spawned a new direction in the development of metallic, as well as non-metallic materials [4,5]. Even though considerable resources has been dedicated to the study of a vast range of HEA properties, phase compositions as well as guiding principles for further alloy design [6][7][8][9], the properties of most HEAs are still not competitive in comparison to more classic materials [3,10]. One of the biggest issues with HEAs is the vast compositional space resulting from inherent chemical complexity, in which it is extremely hard to choose the compositions [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ti on the Tensile Properties of the High-Strength Powder Metallurgy High Entropy Alloys

et al. 2020

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The focus of this study is the evaluation of the influence of Ti concentration on the tensile properties of powder metallurgy high entropy alloys. Three Ni1.5Co1.5CrFeTiX alloys with X = 0.3; 0.5 and 0.7 were produced by mechanical alloying and spark plasma sintering. Additional annealing heat treatment at 1100 °C was utilized to obtain homogenous single-phase face centered cubic (FCC) microstructures, with minor oxide inclusions. The results show that Ti increases the strength of the alloys by increasing the average atomic size misfit i.e., solid solution strengthening. An excellent combination of mechanical properties can be obtained by the proposed method. For instance, annealed Ni1,5Co1,5CrFeTi0.7 alloy possessed the ultimate tensile strength as high as ~1600 MPa at a tensile ductility of ~9%, despite the oxide contamination. The presented results may serve as a guideline for future alloy design of novel, inclusion-tolerant materials for sustainable metallurgy.

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Boundary micro-cracking in metastable Fe45Mn35Co10Cr10 high-entropy alloys

Cited by 82 publications

References 44 publications

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys

Fatigue Crack Growth at Different Frequencies and Temperatures in an Fe-based Metastable High-entropy Alloy

Influence of Ti on the Tensile Properties of the High-Strength Powder Metallurgy High Entropy Alloys

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