Is “strain glass” a nanodomain frozen transition?

Liu, Jiayi; Jin, Xianglin

doi:10.1002/pssb.201350356

Cited by 8 publications

(4 citation statements)

References 38 publications

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“…Also, all of them have characteristic ferroic dynamics slowing down with decreasing temperature. Note that there are discussions in literature regarding whether the source of the strain disorder (i.e., nanoscale heterogeneities) at lower temperature in a “strain glass” state is due to dynamical arrest of thermally equilibrated strain disorder of higher temperature (“strain liquid”), or quenched-in diffusive disorder (chemical) from still higher temperatures252627, or both. For the Elinvar anomaly that we are concerned in the current study, it makes no difference whether the strain glass state is exactly the analog of liquid melt-quench produced structural glass or any other forms of “amorphization” that have not experienced the typical cooling-induced viscosity-increase liquid-glass transition.…”

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confidence: 99%

A new mechanism for low and temperature-independent elastic modulus

Zhang

Wang

Ren

2015

Sci Rep

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The first Elinvar alloy, FeNiCr, which has invariant elastic modulus over a wide temperature range, was discovered almost 100 years ago by Guillaume. The physical origin of such an anomaly has been attributed to the magnetic phase transition taking place in the system. However, the recent discovery of non-magnetic Elinvar such as multi-functional β-type Ti alloys has imposed a new challenge to the existing theories. In this study we show that random field from stress-carrying defects could suppress the sharp first-order martensitic transformation into a continuous strain glass transition, leading to continued formation and confined growth of nano-domains of martensite in a broad temperature range. Accompanying such a unique transition, there is a gradual softening of the elastic modulus over a wide temperature range, which compensates the normal modulus hardening due to anharmonic atomic vibration, resulting in a low and temperature-independent elastic modulus. The abundance of austenite/martensite interfaces are found responsible for the low elastic modulus.

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confidence: 99%

A new mechanism for low and temperature-independent elastic modulus

Zhang

Wang

Ren

2015

Sci Rep

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“…Point defects determine the behavior of structural changes in the pre-transformation region of temperature, preceding B2 R MT [50]. However, the role of point defects in the process of martensitic phase formation is still controversial [51]. There is an alternative view in determining the role of nesting features in the Fermi surface of TiNi in the process of martensitic phase formation [52].…”

Section: The Role Of Point Defects In Martensitic Transformationmentioning

confidence: 99%

Formation of vacancy-type defects in titanium nickelide

Батурин

Лотков

Гришков

et al. 2015

MATEC Web of Conferences

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Abstract. In this report we briefly review the current state-of-the-art and challenges in determining point defect properties from first-principles calculations as well as from experimental measurements in titanium nickelid. Based on the vacancy formation energy and the activation energy for vacancy migration in TiNi, vacancy mediated diffusion mechanism was examined. The influence of vacancies and antisite defects on the TiNi structural phase transition has been described. IntroducingInvestigating diffusion processes in titanium nickelid alloys sharpened several issues on types and characteristic features of point defects. In the publication of Bastin and Riek [1] it was established that the chemical diffusion coefficient in TiNi is determined by Ni diffusion, and the activation energy for diffusion is too small (~1.4 eV) compared to other B2 intermetallic compounds. Investigating Ni diffusion in relation to pressure [2] showed that activation volume of diffusion Ni in TiNi within experimental error is equals zero. This could imply that diffusion mechanism is interstitial mediated or that there are structural vacancies in the intermetallic compound. Diffusion mechanism in TiNi is a particular case to explain the common diffusion mechanism in B2 intermetallic compounds. As discussion of the diffusion mechanism in B2 intermetallic, causes disputes [3][4][5], research of point defects in TiNi is relevant. Besides, some authors [6][7][8][9] state that point defects configuration of a B2 phase can play an important role in nucleation and growth processes of martensitic phase. Vacancy formation energy in titanium nickelidIn AB compounds with B2 structure interatomic potentials of identical atoms AA and BB have distinct dependency on the distance between identical atoms in given coordination sphere; further, interatomic potentials of these identical atoms also have a different potential well [9]. This results in the fact that the vacancy formation energy (E v ) on the different atomic sublattices is non-identical, which, in its turn, could be revealed in some B2 compounds by the positron annihilation spectroscopy (PAS) method [10].Presently, investigations in measurement the vacancy formation energy in a series of intermetallic compounds In the reference well-annealed state average positron lifetime corresponds to a delocalized positron state, i.e. the vacancy concentration in a sample lower than the PAS method threshold limit. Further, when heating the a Corresponding author: abat@ispms.tsc.ru

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“…The slowing down of the ferroic dynamics can also potentially lead to significant metastability, that is, a system ending up in a quite disordered ferroic state (A, defined as an 'amorphous' ferroic state, for example, the ferroic glass in Figure 1) that is relatively far from the theoretical optimum (X) (for example, long-range ordered domain structures), but the ferroic relaxation (ageing) would be sluggish when compared with the laboratory timescale such that one must reckon with A. There are discussions in the strain glass literature regarding whether the source of the ferroic disorder (also known as nanoscale heterogeneities) at lower temperatures in A is due to a dynamical arrest of the thermally equilibrated ferroic disorder of higher temperatures (strain liquid), or a quenchedin 'diffusive' disorder (chemical) from even higher temperatures [13][14][15] or both. For this study, however, the exact source of this ferroic disorder is irrelevant.…”

Section: Theoretical Analysismentioning

confidence: 99%