Thermal, magnetic field- and stress-induced transformation in Heusler-type Co-Cr-Al-Si shape memory alloys

Odaira, Takumi; Xu, Xiao; Miyake, Atsushi; Omori, Toshihiro; Tokunaga, Masashi; Kainuma, Ryosuke

doi:10.1016/j.scriptamat.2018.04.033

Cited by 25 publications

(6 citation statements)

References 24 publications

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“…We assumed that the combination of these magnetic transitions acts to prevent the entropy change DS from deviating too far from zero. The anomalies in this alloy system, Invar alloy (29), Co-based alloys (22,23,30,31), and Fe (32,33) all have a deep relationship with magnetism.…”

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confidence: 93%

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Noguchi

et al. 2020

Science

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105

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Shape memory alloys recover their original shape after deformation, making them useful for a variety of specialized applications. Superelastic behavior begins at the critical stress, which tends to increase with increasing temperature for metal shape memory alloys. Temperature dependence is a common feature that often restricts the use of metal shape memory alloys in applications. We discovered an iron-based superelastic alloy system in which the critical stress can be optimized. Our Fe-Mn-Al-Cr-Ni alloys have a controllable temperature dependence that goes from positive to negative, depending on the chromium content. This phenomenon includes a temperature-invariant stress dependence. This behavior is highly desirable for a range of outer space–based and other applications that involve large temperature fluctuations.

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confidence: 93%

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Noguchi

et al. 2020

Science

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105

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“…Heusler alloys have been a research hotspot for more than 100 years, gaining the attention of researchers due to their excellent properties and wide range of applications. High Curie temperatures (T C ), tunable electronic structure, suitable lattice constants for semiconductors and various magnetic properties (Manna et al, 2018) make Heusler alloys ideal materials for spin-gapless semiconductors (Wang et al, 2018;Bainsla et al, 2015;Gao et al, 2019), half-metallic materials (Shigeta et al, 2018;Khandy et al, 2018) and shape memory alloys (Yu et al, 2015;Odaira et al, 2018;Li et al, 2018a,b;Carpenter & Howard, 2018). Normally, there are three types of Heusler alloys: half-Heusler-type XYZ (Makongo et al, 2011; Anand et al, 2018; Zhang et al, 2016; Hou et al, 2015), full-Heusler-type X 2 YZ (Akriche et al, 2017; Babiker et al, 2017;Li et al, 2018a,b) and the equiatomic quaternary Heusler XYMZ materials (Bahramian & Ahmadian, 2017;Qin et al, 2017;Wang et al, 2017;Feng et al, 2018) with stoichiometry 1:1:1:1, where the X, Y and M atoms are usually transition-metal atoms, whereas the Z atom is a maingroup element.…”

Section: Introductionmentioning

confidence: 99%

Competition between cubic and tetragonal phases in all-d-metal Heusler alloys, X _2−xMn_1+xV (X = Pd, Ni, Pt, Ag, Au, Ir, Co; x = 1, 0): a new potential direction of the Heusler family

Han

Feng

et al. 2019

IUCrJ

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In this work, a series of all-d-metal Heusler alloys, X 2 − x Mn1 + x V (X = Pd, Ni, Pt, Ag, Au, Ir, Co; x; = 1, 0), were predicted by first principles. The series can be roughly divided into two categories: XMn2V (Mn-rich type) and X 2MnV (Mn-poor type). Using optimized structural analysis, it is shown that the ground state of these all-d-metal Heusler alloys does not fully meet the site-preference rule for classic full-Heusler alloys. All the Mn-rich type alloys tend to form the L21 structure, where the two Mn atoms prefer to occupy the A (0, 0, 0) and C (0.5, 0.5, 0.5) Wyckoff sites, whereas for the Mn-poor-type alloys, some are stable with XA structures and some are not. The c/a ratio was also changed while maintaining the volume the same as in the cubic state to investigate the possible tetragonal transformation of these alloys. The Mn-rich Heusler alloys have strong cubic resistance; however, all the Mn-poor alloys prefer to have a tetragonal state instead of a cubic phase through tetragonal transformations. The origin of the tetragonal state and the competition between the cubic and tetragonal phases in Mn-poor alloys are discussed in detail. Results show that broader and shallower density-of-states structures at or in the vicinity of the Fermi level lower the total energy and stabilize the tetragonal phases of X 2MnV (X = Pd, Ni, Pt, Ag, Au, Ir, Co). Furthermore, the lack of virtual frequency in the phonon spectra confirms the stability of the tetragonal states of these Mn-poor all-d-metal Heusler alloys. This work provides relevant experimental guidance in the search for possible martensitic Heusler alloys in all-d-metal materials with less Mn and new spintronic and magnetic intelligent materials among all-d-metal Heusler alloys.

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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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Thermal, magnetic field- and stress-induced transformation in Heusler-type Co-Cr-Al-Si shape memory alloys

Cited by 25 publications

References 24 publications

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Competition between cubic and tetragonal phases in all-d-metal Heusler alloys, X _2−xMn_1+xV (X = Pd, Ni, Pt, Ag, Au, Ir, Co; x = 1, 0): a new potential direction of the Heusler family

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

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Thermal, magnetic field- and stress-induced transformation in Heusler-type Co-Cr-Al-Si shape memory alloys

Cited by 25 publications

References 24 publications

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Competition between cubic and tetragonal phases in all-d-metal Heusler alloys, X 2−x Mn1+x V (X = Pd, Ni, Pt, Ag, Au, Ir, Co; x = 1, 0): a new potential direction of the Heusler family

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

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Competition between cubic and tetragonal phases in all-d-metal Heusler alloys, X _2−xMn_1+xV (X = Pd, Ni, Pt, Ag, Au, Ir, Co; x = 1, 0): a new potential direction of the Heusler family

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