Electronic structure and the martensitic transformation in β-phase Ni-Al alloys:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Al</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>27</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>NMR and specific-heat measurements

Rubini, S.; Dimitropoulos, C.; Aldrovandi, S.; Borsa, F.; Torgeson, D. R.; Zioło, J.

doi:10.1103/physrevb.46.10563

Cited by 18 publications

(12 citation statements)

References 18 publications

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“…New support for these ideas has come from first-principles calculations by Zhao & Harmon yielding the proper phonon anomalies which are attributed to the nesting of the Fenni-surface [43]. Also, recent results of NMR studies by Rubini, Dimitropoulos, Aldrovandi, Borsa, Torgeson & Ziolo are interpreted in terms of a continuous formation of martensite with an incomplete degree of deformation [44], again confirming the above picture. An increasing degree of distortion when approaching the transition temperature was also observed in buLk thermal expansion experiments by Liu, Finlayson, Smith & Tanner [45].…”

Section: Precursors In Ni-a1supporting

confidence: 61%

Martensitic and Related Transformations in Ni-Al Alloys

Schryvers

1995

J. Phys. IV France

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Abstract:The present paper gives a review of results of recent studies investigating the fundamentals of the martensitic and related phase tr-ansformations in Ni-A]. For the former case, the emphasis will be on the microstructure of martensite plates. The latter include the metastable Ni2A1 o-like and stable Ni5A13 bainitic phases. These phases will be discussed in view of their atomic structure, nucleation, growth and effect on the martensitic transformation. A separate chapter will deal with precursor effects.

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Section: Precursors In Ni-a1supporting

confidence: 61%

Martensitic and Related Transformations in Ni-Al Alloys

Schryvers

1995

J. Phys. IV France

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“…In case of Ni-Al the Einstein temperature is 500 K so that we set s at 250 K as the initial value [23]. This value is similar to the value obtained from fitting of spontaneous strain data of Ni-Al (II) as discussed later.…”

Section: Differential Scanning Calorimetry Experimentssupporting

confidence: 53%

“…The phase transition in Ni-Al was extensively studied by various techniques [19][20][21][22][23][24][25][26]. Pre-transformation phenomena and only limited phonon softening above the phase transition were found [19,20].…”

Section: Introductionmentioning

confidence: 99%

The martensitic phase transition in Ni–Al: experimental observation of excess entropy and heterogeneous spontaneous strain

Zhang¹,

Salje²,

Schryvers³

et al. 2008

J. Phys.: Condens. Matter

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Experimental studies of the martensitic phase transition of Ni 63.5 Al 36.5 by means of differential scanning calorimetry and x-ray diffraction show a coexistence interval of 30 K for the austenite and martensitic phase. Within a smaller interval of 10 K near the upper limit of the stability of the martensitic phase no strain broadening of x-ray diffraction lines was observed for either phase. With decreasing temperature, diffraction profiles broaden, with a maximum reached when the sample is fully transformed into the martensitic phase. This observation is analyzed in terms of heterogeneous strain broadening due to imperfect microstructural self-accommodation of the martensitic grains. No strain broadening occurs when the martensitic phase is not fully interconnected but forms isolated islands inside an austenite matrix. It is concluded that large stress fields result from the coalescence of martensitic regions in the sample. The calibration of the excess entropy from the measurements of the specific heat confirms the Landau potential of Salje et al (2007 Appl. Phys. Lett. 90 221903). Imperfect self-accommodation does not contribute to a measurable increase of the entropy of the sample.

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“…Indeed, there are many evidences of valence state redistribution upon binary and ternary metallic alloy formation due to chemical interaction of the elements. 13,[17][18][19][20][21][22][23][24][25][26][27][28][29] Modification of the density of states (DOS) shape in the vicinity of E f was reported to correlate with changes in material properties such as ductility/brittleness, elastic moduli, 20,26,28 micro-hardness, 26 grain boundary cohesive strength, 20 energy of martensitic transformation, 28 heat formation, cohesive energy and phase stability. 13,19,21,22 DOS transformation upon alloy formation is mainly attributed to hybridization between valence electronic states of alloying elements.…”

Section: Introductionmentioning

confidence: 99%