Martensitic transformation and shape memory effect at high temperatures in off-stoichiometric Co2VSi Heusler alloys

Jiang, Hengxing; Xu, Xiao; Omori, Toshihiro; Nagasako, Makoto; Ruan, Jun; Yang, Shuiyuan; Wang, Cuiping; Liu, Xingjun; Kainuma, Ryosuke

doi:10.1016/j.msea.2016.08.083

Cited by 30 publications

(7 citation statements)

References 39 publications

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“…It is unclear what percentage of this strength reduction was due to the observed increase in porosity with indium additions. Jiang, et al [9] also evaluated the martensitic transformation and mechanical properties in compression of several materials and identified failure stresses in excess of 2200 MPa. Hsu, et al [11] investigated the effect of aluminum additions to NiTiHf Half-Heusler alloys and observed an increase in the strength as a function of the aluminum content up to ∼1500 MPa at 3% strain.…”

Section: Main Textmentioning

confidence: 99%

“…They observed a significant reduction in strain to failure with increasing amounts of indium, but the cause of this was attributed to increased porosity. Jiang, et al [9] identified strains to failure of 17–20% in martensitic material, though they suggest that the high values should only be treated as qualitative values due to machine compliance. Huang, et al [12] evaluated strains to failure of material exhibiting martensitic transformations of up to 5%.…”

Section: Main Textmentioning

confidence: 99%

“…Due to their potential as functional magnetic shape memory alloys (MSMA), there is some work on the mechanical performance of Heusler alloys relative to martensitic transformations [7, 8, 9, 10, 11, 12, 13]. While the martensitic transformation is mechanical in nature, the transformation strain values and failure strain values are indicative of transformation induced plasticity (TRIP) which will typically yield a change in magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

“…There are also several works that reference mechanical properties which involve non-stoichiometric Heusler alloys. These works include modeling predictions of elastic properties as the chemistry moves from one stable alloy to another [14, 15, 16], as well as doping for improvement in giant magnetocaloric effect [17], thermoelectrics [5, 6], and magnetic shape memory alloys [7, 9, 18].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of Heusler alloys

Everhart

Newkirk

2019

Heliyon

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Heusler alloys have been a significant topic of research due to their unique electronic structure, which exhibits half-metallicity, and a wide variety of properties such as magneto-calorics, thermoelectrics, and magnetic shape memory effects. As the maturity of these materials grows and commercial applications become more near-term, the mechanical properties of these materials become an important factor to both their processing as well as their final use. Very few studies have experimentally investigated mechanical properties, but those that exist are reviewed within the context of their magnetic performance and application space with specific focus on elastic properties, hardness and strength, and fracture toughness and ductility. A significant portion of research in Heusler alloys are theoretical in nature and many attempt to provide a basic view of elastic properties and distinguish between expectations of ductile or brittle behavior. While the ease of generating data through atomistic methods provides an opportunity for wide reaching comparison of various conceptual alloys, the lack of experimental validation may be leading to incorrect conclusions regarding their mechanical behavior. The observed disconnect between the few available experimental results and the numerous modeling results highlights the need for more experimental work in this area.

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Section: Main Textmentioning

confidence: 99%

Section: Main Textmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of Heusler alloys

Everhart

Newkirk

2019

Heliyon

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“…Several Co 2 -based Heusler alloys (with the stoichiometric composition X 2 Y Z) such as Co-Ni-Ga, [1,2] Co 2 Cr(Ga,Si), [3] Co 2 Cr(Al,Si), [4] Co-V-Ga, [5][6][7][8][9] and Co-V-Si [10,11] recently have attracted a lot of research due to their extrordinary shape memory effect. This is because they possess the reversible martensitic transformation (MT) from the L2 1 phase (facecentered-cubic, fcc, space group Fm 3m) to the so-called D0 22 phase (body-centered-tetragonal, bct, space group I4/mmm), described clearly in Ref.…”

Section: Introductionmentioning

confidence: 99%

Alloying and magnetic disordering effects on phase stability of Co₂ Y Ga (Y = Cr, V, and Ni) alloys: A first-principles study

Li¹,

Yang²,

Zhou³

2022

Chinese Phys. B

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The alloying and magnetic disordering effects on the site occupation, elastic property, and phase stability of Co2 YGa (Y=Cr, V, and Ni) shape memory alloys are systematically investigated by using the first-principles exact muffin-tin orbitals method. It is shown that with increasing the magnetic disordering degree (y), their tetragonal shear elastic constant C' ((C 11 - C 12)/2) of the L21 phase decreases whereas the elastic anisotropy (A) increases, and upon tetragonal distortions the cubic phase gets more and more unstable. Co2CrGa and Co2VGa alloys with y ≥ 0.2 thus can show the martensitic transformation (MT) from L21 to D022 as well as Co2NiGa. In off-stoichiometric alloys, the site preference is controlled by both the alloying and magnetic effects. At the FM state, the excess Ga atom always tends to take the Y sublattice, whereas the excess Co atom favors the Y site when Y=Cr, and the excess Y atom prefers the Co site when Y=Ni. The Ga-deficient Y=V alloys can occur the MT also at the FM state by means of Co or V doping, and the MT temperature (T M ) should increase with their addition. In the corresponding FM Y=Cr alloys, nevertheless, with Co or Cr substituting for Ga, the reentrant MT (RMT) from D022 to L21 is promoted and then T M for the RMT should decrease. The alloying effect on the MT of these alloys is finally well explained by means of the Jahn-Teller effect at the paramagnetic (PM) state. At the FM state, it may originate from the competition between the austenite and martensite about their strength of the covalent banding between Co and Ga as well as Y and Ga.

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Phase Stability, Magnetic Properties, and Martensitic Transformations in Co‐Based Heusler Alloys

Umetsu

Kainuma

2020

Materials Science and Technology

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The phase stability, magnetic properties, electronic state, and martensitic transformation appearing in the L 2 1 ‐type ordered phase of Co‐based Heusler alloys are reviewed. Critical temperatures of the L 2 1 / B 2 order–disorder transition in stoichiometric Co 2 YZ ( Y = Ti, V, Cr, Mn, and Fe) alloys were experimentally estimated, and the degrees of order of the L 2 1 structure in stoichiometric Co 2 Y Ga alloys quenched from an elevated temperature were evaluated by powder neutron diffraction. All the experimental data are fundamentally consistent with the theoretical results based on the Bragg–Williams–Gorsky (BWG) approximation. The magnetic properties and electronic state for the stoichiometric Co 2 Y Ga alloys are briefly reviewed, and the concept of high‐field magnetic susceptibility, which is correlated to the characteristic feature of the density of states in the half‐metallic ferromagnets, is introduced. Martensitic transformations appearing in the nonstoichiometric Co‐based Heusler alloys are also presented and the phase stability is reviewed. In particular, the reentrant martensitic transformation in Co 2 Cr (Ga, Si) alloys is introduced together with some unique properties, such as cooling‐induced shape memory effect and inverse temperature dependence of the critical stress in the stress‐induced transformation.

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Martensitic transformation and shape memory effect at high temperatures in off-stoichiometric Co2VSi Heusler alloys

Cited by 30 publications

References 39 publications

Mechanical properties of Heusler alloys

Mechanical properties of Heusler alloys

Alloying and magnetic disordering effects on phase stability of Co₂ Y Ga (Y = Cr, V, and Ni) alloys: A first-principles study

Phase Stability, Magnetic Properties, and Martensitic Transformations in Co‐Based Heusler Alloys

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Martensitic transformation and shape memory effect at high temperatures in off-stoichiometric Co2VSi Heusler alloys

Cited by 30 publications

References 39 publications

Mechanical properties of Heusler alloys

Mechanical properties of Heusler alloys

Alloying and magnetic disordering effects on phase stability of Co2 Y Ga (Y = Cr, V, and Ni) alloys: A first-principles study

Phase Stability, Magnetic Properties, and Martensitic Transformations in Co‐Based Heusler Alloys

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Alloying and magnetic disordering effects on phase stability of Co₂ Y Ga (Y = Cr, V, and Ni) alloys: A first-principles study