Revealing the microstructural evolution in a high entropy alloy enabled with transformation, twinning and precipitation

Sinha, Shyam Kanta; Nene, S.S.; Frank, M.; Liu, K.; Mishra, Rajiv S.; McWilliams, Brandon; Cho, K.C.

doi:10.1016/j.mtla.2019.100310

Cited by 19 publications

(9 citation statements)

References 59 publications

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“…The individual trends (of the different alloys) are attributed to the combined effect of alloy chemistry, responsive phase evolution, elastoplastic deformation characteristics and transformation volume change. Flexible microstructural evolution in these alloys with processing and deformation 12–14 indicates that the change in c/a is related to microstructural evolution. Therefore, phase fractions as a function of specimen condition are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Our recent work introduced an alloy design strategy that involved responsive phase evolution, thereby stabilizing either thermodynamically stable γ or unstable ε phase in the as-cast condition itself, and giving rise to “Microstructurally Flexible HEAs 12,13 ”. This microstructural flexibility was realized by synergistic variation of alloy chemistry, processing conditions and annealing treatments 12–14 . Excellent tensile properties were achieved in transformative HEAs processed by friction stir processing (FSP), a technique that involves the synergistic application of strain, strain rate and temperature 15 .…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

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

Self Cite

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“…We can then attempt to control the mechanical properties of a material, including strength and ductility [69]. This is the result of the activation of various strengthening mechanisms, where some of them can occur simultaneously: solid-solution strengthening, composite effects, twinning, grain refinements, precipitation hardening [70,71]. Compared to conventional alloys, the diffusion rate in HEAs is lower due to the lattice distortion effect and the multi-principal component characteristics.…”

Section: Hardness Resultsmentioning

confidence: 99%

Multi-component low and high entropy metallic coatings synthesized by pulsed magnetron sputtering

Strzelecki

Nowakowska-Langier

Mulewska

et al. 2022

Surface and Coatings Technology

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“…This gives them many unique properties which may be tailored at will (heat treatment, cold rolling [21][22][23][24][25][26], precipitation [27][28][29][30][31], irradiation [32]). They also exhibit excellent directional properties [33] with formation of distinct twins [34][35][36], faults [37], dislocation evolution sites, texture [22,23,25,26,33,[38][39][40][41][42][43][44][45] and bands along certain preferred crystallographic planes even in hexagonal close packed structures [34][35][36]46]. These anisotropic properties are strong function of rolling [21][22][23][24][25][26], working, or forging (swaging) [47] direction and annealing temperature and can be utilized to benefit.…”

Section: Design and Materialsmentioning

confidence: 99%

Materials for Outer Shell of 1.170 Gwh (1.00669 Kilo Ton TNT) Fusion Device - Weight Basis

Rafique¹

2023

Preprint

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With recent developments in fusion engineering, interest has sparked in development of fusion devices for deterrent. Enormous amount of energy generated by combining two light nuclei could be contained and manipulated at will to trigger and accelerate micro explosions (from shock wave, x-rays or ion beam focusing) which finally result in full scale blast. Materials required to make such device are critical. They must possess high strength, high hardness, ductility, formability, drawability, and anisotropic properties. High entropy alloys (HEA) are new class of materials which nicely fulfils this requirement. Essentially, they are solid solutions of multi principal elements (usually > 5) eliminating the need of base metal as in conventional alloys. This gives them many unique properties which may be tailored at will (heat treatment, cold rolling, precipitation, irradiation). They also exhibit excellent directional properties with formation of distinct bands along certain preferred crystallographic planes even in hexagonal close packed structures. These anisotropic properties are strong function of rolling, working, or forging (swaging) direction and can be utilized to benefit. This study encompasses making outer shell of a typical fusion device selected on the basis of the weight, which is a function of area of pay load bay of carrier aircraft.

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Revealing the microstructural evolution in a high entropy alloy enabled with transformation, twinning and precipitation

Cited by 19 publications

References 59 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

Multi-component low and high entropy metallic coatings synthesized by pulsed magnetron sputtering

Materials for Outer Shell of 1.170 Gwh (1.00669 Kilo Ton TNT) Fusion Device - Weight Basis

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