Transformation behaviour and martensite stabilization in the ferromagnetic Co–Ni–Ga Heusler alloy

Chernenko, V.A.; Pons, J.; Cesari, E.; Zasimchuk, I. K.

doi:10.1016/j.scriptamat.2003.09.024

Cited by 99 publications

(79 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The interesting phenomenon, which is not well explored and comprehended yet, is a stabilisation of the non-modulated martensitic phase (2M-martensite) in the Heusler ferromagnetic shape memory alloys [12,15,23]. The non-modulated 2M-martensite is very attractive subject of inquiry because it corresponds to the ground state of these alloys [24] and shows a rather large magnetic field-induced strain of 0.2% [25].…”

Section: Introductionmentioning

confidence: 99%

Destabilization of Ni–Mn–Ga martensite: Experiment and theory

et al. 2012

View full text Add to dashboard Cite

Tensile stress-strain behavior of Ni 57.5 Mn 22.5 Ga 20.0 single crystal exhibiting a hightemperature 2M-martensitic phase stable up to 360ºC has been studied in the course of thermal and mechanical cycling. The ultra-large reversible strains, about 9%, caused by the shape memory and superelasticity effects, have been observed up to 400 ºC being the instrumental temperature limit. Abnormally large two-way shape memory effect with 9% of strain magnitude has been found. The cycling procedure and the variation of thermal/mechanical routs of the training of samples revealed the destabilization (rejuvenation) of martensite. This physical effect is opposite to the well-known phenomenon of martensite stabilization. A destabilization effect is explained phenomenologically in terms of internal stressing of the alloy sample by the crystal defects.Keywords: Ni-Mn-Ga single crystal, high-temperature shape memory and superelasticity, two-way shape memory effect, destabilization of martensite.2

show abstract

Section: Introductionmentioning

confidence: 99%

Destabilization of Ni–Mn–Ga martensite: Experiment and theory

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Furthermore, Ni-Mn-Ga alloys are disadvantageous because of their poor room temperature ductility or high costs of elements [1][2][3]. In the literature, various other systems including Ni-Mn-(Al, Sn, Sb, In) [4,5], Co-Ni-(Al, Ga) [6][7][8][9][10][11][12][13], Ni-Fe-(Al, Ga) [14] and Cu-Mn-(Al, Ga) [15,16] have been proposed as candidates for new FSMAs. Of special interest are Heusler systems based on Co, Fe, and Zn: For the Co-Ni-(Al, Ga) and Ni-Ga-Fe-Co alloys, the martensitic start temperature T S decreases with increasing Co content while Curie temperature and spontaneous magnetization increase [17,18].…”

Section: Introductionmentioning

confidence: 99%

Characterization of new ferromagnetic Fe-Co-Zn-Ga alloys by ab initio investigations

Dannenberg

Gruner

Wuttig

et al. 2009

ESOMAT 2009 - 8th European Symposium on Martensitic Transformations

View full text Add to dashboard Cite

Abstract.We have calculated structural energy differences, magnetic interaction constants and mixing energies of Fe-Co-Ga(Zn) alloys in order to gain information about their suitability for ferromagnetic shape memory devices. We considered the classical Heusler structure as well as an ordering type in which the Co and one Fe sublattice are interchanged. The results of our density functional theory investigations suggest high Curie and martensitic phase transition temperatures for the Ga-based as well as for the Zn-based systems. In case of hypothetical Fe2CoZn alloys, the classically ordered Heusler structure is energetically preferred. In Ga based alloys, the ordering type with Co partially on Fe sites appears to be more stable. We propose that a systematic variation of composition by successive addition of Zn and Co to Fe-Co-Ga may result in a promising new ferromagnetic shape memory alloy of type Fe2−xCo1+xGa1−yZny.

show abstract

“…This type of transformational behavior of an alloy is not typical but, indeed, it was observed for Co-Ni-Ga alloy [71].…”

Section: Martensite Stabilization In Au-cd Alloysmentioning

confidence: 68%

“…) ( (71) proves to be proportional to the product of volume change during MT and spontaneous volume magnetostriction.…”

Section: Elastic and Magnetic Components Of The Entropy Change During Mtmentioning

confidence: 95%

Transformation Volume Effects on Shape Memory Alloys

Chernenko

L’vov²,

Cesari³

et al. 2013

Metals

View full text Add to dashboard Cite

Abstract:It is generally accepted that the martensitic transformations (MTs) in the shape memory alloys (SMAs) are mainly characterized by the shear deformation of the crystal lattice that arises in the course of MT, while a comparatively small volume change during MT is considered as the secondary effect, which can be disregarded when the basic characteristics of MTs and functional properties of SMAs are analyzed. This point of view is a subject to change nowadays due to the new experimental and theoretical findings. The present article elucidates (i) the newly observed physical phenomena in different SMAs in their relation to the volume effect of MT; (ii) the theoretical analysis of the aforementioned volume-related phenomena.

show abstract

Transformation behaviour and martensite stabilization in the ferromagnetic Co–Ni–Ga Heusler alloy

Cited by 99 publications

References 14 publications

Destabilization of Ni–Mn–Ga martensite: Experiment and theory

Destabilization of Ni–Mn–Ga martensite: Experiment and theory

Characterization of new ferromagnetic Fe-Co-Zn-Ga alloys by ab initio investigations

Transformation Volume Effects on Shape Memory Alloys

Contact Info

Product

Resources

About