High Entropy Shape Memory Alloys

Firstov, G.S.; Kosorukova, Tetiana; Koval, Yu. N.; Odnosum, V. V.

doi:10.1016/j.matpr.2015.07.335

Cited by 100 publications

(73 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results of [1] X-ray data shown in Fig. 1 were subjected to Rietveld refinement, using the assumption of (B2+B19`) phase mixture.…”

Section: Resultsmentioning

confidence: 99%

“…Very recently, following HEA concept mentioned above, it was found that HEA of TiZrHfCoNiCu intermetallic family might undergo martensitic transformation (MT), which is accompanied by shape memory effect with attractive parameters [1], including MT and shape memory temperatures above 400 K. The latter, according to [4,5], allows to consider these high entropy intermetallic compounds as perspective functional materials -high temperature shape memory alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The crystal structure of the stable high temperature phase of TiZrHfCoNiCu high entropy intermetallic can be considered roughly as of B2 type [1]. It was also shown that B2 phase becomes unstable to MT on cooling in this high entropy intermetallic, once Co is replaced equally by Cu and Ni.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown very recently that despite high thermal stability some high entropy alloys, namely, intermetallic compounds of TiZrHfCoNiCu family, undergo martensitic transformation and exhibit shape memory effect [1]. It was also found that X-ray diffraction patterns taken from those compounds resemble qualitatively ones of B2 ordering type for austenitic state and B19` -for martensite.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Electronic and crystal structure of the high entropy TiZrHfCoNiCu intermetallics undergoing martensitic transformation

Firstov

Timoshevski

Kosorukova

et al. 2015

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. It was shown very recently that despite high thermal stability some high entropy alloys, namely, intermetallic compounds of TiZrHfCoNiCu family, undergo martensitic transformation and exhibit shape memory effect [1]. It was also found that X-ray diffraction patterns taken from those compounds resemble qualitatively ones of B2 ordering type for austenitic state and B19` -for martensite. It is going to be shown [2] that the ordered structure of austenite phase is not B2 but is a result of group-subgroup transition down to triclinic P1 space group. Present paper reports onto the results of electron structure modelling combined with crystal structure analysis with the help of experimental data Rietveld refinement performed for TiZrHfCoNiCu intermetallics. Crystal structures of austenite and martensite phases for these high entropy intermetallics will be discussed.

show abstract

“…The results of [1] X-ray data shown in Fig. 1 were subjected to Rietveld refinement, using the assumption of (B2+B19`) phase mixture.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Electronic and crystal structure of the high entropy TiZrHfCoNiCu intermetallics undergoing martensitic transformation

Firstov

Timoshevski

Kosorukova

et al. 2015

MATEC Web of Conferences

View full text Add to dashboard Cite

show abstract

“…For example, Fe-Mn-Al-Ni SMA [1] shows a small temperature dependence of the superelastic stress. High-entropy alloy system Ti-Zr-Hf-Co-Ni-Cu [8] shows wide temperature hysteresis of about 90 K at temperatures higher than 400 K of martensitic transformation. Fe-28Ni-17Co-11.5Al-2.5Ta-0.05B SMA [9] exhibits a superelastic strain of more than 13% with a tensile strength above 1 GPa.…”

Section: Introductionmentioning

confidence: 99%

Shape Memory and Huge Superelasticity in Ni–Mn–Ga Glass-Coated Fibers

et al. 2017

View full text Add to dashboard Cite

Ni-Mn-Ga polycrystalline alloy fibers with diameters of 33 µm are reported to exhibit significantly improved ductility and huge superelastic and shape memory strains in comparison to conventional brittle bulk polycrystalline alloys. Particularly, the recoverable strain of the Ni54.9-Mn23.5-Ga21.6 fiber can be as high as 10% at 40 • C. Such optimized behavior has been achieved by a suitable fabrication process via a glass-coating melt spinning method. The superelastic properties at different temperatures and the shape memory effect of Ni54.9-Mn23.5-Ga21.6 fibers were investigated.

show abstract

A Unifying Perspective of Common Motifs That Occur across Disparate Classes of Materials Harboring Displacive Phase Transitions

Grünebohm

Hütten

Böhmer

et al. 2023

Advanced Energy Materials

View full text Add to dashboard Cite

Several classes of materials manifest displacive phase transitions, including shape memory alloys, many electronically correlated materials, superconductors, and ferroelectrics. Each of these classes of materials displays a wide range of fascinating properties and functionalities that are studied in disparate communities. However, these materials’ classes share similar electronic and phononic instabilities in conjunction with microstructural features. Specifically, the common motifs include twinned microstructures, anomalies in the transport behavior, softening of specific phonons, and frequently also (giant) Kohn anomalies, soft phonons, and/or nesting of the Fermi surface. These effects, phenomena, and their applications have until now been discussed in separate communities, which is a missed opportunity. In this perspective a unified framework is presented to understand these materials, by identifying similarities, defining a unified phenomenological description of displacive phase transitions and the associated order parameters, and introducing the main symmetry‐breaking mechanisms. This unified framework aims to bring together experimental and theoretical know‐how and methodologies across disciplines to enable unraveling hitherto missing important mechanistic understanding about the phase transitions in (magnetic) shape memory alloys, superconductors and correlated materials, and ferroelectrics. Connecting structural and electronic phenomena and microstructure to functional properties may offer so‐far unknown pathways to innovate applications based on these materials.

show abstract

High Entropy Shape Memory Alloys

Cited by 100 publications

References 11 publications

Electronic and crystal structure of the high entropy TiZrHfCoNiCu intermetallics undergoing martensitic transformation

Electronic and crystal structure of the high entropy TiZrHfCoNiCu intermetallics undergoing martensitic transformation

Shape Memory and Huge Superelasticity in Ni–Mn–Ga Glass-Coated Fibers

A Unifying Perspective of Common Motifs That Occur across Disparate Classes of Materials Harboring Displacive Phase Transitions

Contact Info

Product

Resources

About