The elastic behaviour of In-Tl alloys in the vicinity of the martensitic transition

Gunton, D.J.; Saunders, G. A.

doi:10.1016/0038-1098(74)90152-5

Cited by 98 publications

(19 citation statements)

References 3 publications

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“…All the points lie in a comparatively narrow temperature range of about 50 K. In most of the shape memory alloys the interval of coexistence of different variants is wider than predicted theoretically because of the presence of crystal structure imperfections. Comparatively narrow intervals of elastic anomalies AT -10 K have been found in the course of acoustic studies of perfect crystals (see Gunton et al, 1974). …”

Section: Intervals Of the U Variablementioning

confidence: 97%

“…For example, on the basis of the experimental data obtained by Guttman (1950) and Gunton and Saunders (1974), the following evaluations may be found for In79T121 alloy: The coordinates ( T ; 6) of A-H, and 0 points in the phase diagram of alloy can be calculated finally: A(338 K, 1.9 MPa), B(332 K; -0.37 MPa), C(328 K; 0 MPa), D(315 K; 1.5 MPa), E(367 K, 30 MPa), F(325 K; 0.33 MPa), G(327 K, -0.15 MPa), H(31.5 K; -2.5 MPa), O(315 K, 0 MPa). All the points lie in a comparatively narrow temperature range of about 50 K. In most of the shape memory alloys the interval of coexistence of different variants is wider than predicted theoretically because of the presence of crystal structure imperfections.…”

Section: Intervals Of the U Variablementioning

confidence: 99%

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Martensitic phase transition with two-component order parameter in a stressed cubic crystal

Gomonaj

L'vov

1994

Phase Transitions

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Martensitic phase transitions in a stressed cubic crystal are studied by means of Landau theory with a twocomponent order parameter. The stress-temperature phase diagram is analyzed theoretically and is shown to consist of six essentially different regions isolated by the liability lines of austenite, tetragonai martensitic and orthorhombic martensitic phases. The triple point is also present in the phase diagram. The role of the cubic term in the Landau-Ginzburg potential in the description of the phase transition properties is emphasized.

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Section: Intervals Of the U Variablementioning

confidence: 97%

Section: Intervals Of the U Variablementioning

confidence: 99%

Martensitic phase transition with two-component order parameter in a stressed cubic crystal

Gomonaj

L'vov

1994

Phase Transitions

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“…Many materials which display ferroelasticity, or a hysteresis in the stress-strain curve (often called pseudoelasticity), display a decrease to zero of one or more of the moduli, attributed to the softening of the phonon modes associated with these moduli. For the In-Tl model system, the 1/2(C 11 -C 12 ) shear modulus tends to zero as the martensitic transformation temperature is approached during heating or cooling [4,5]. Upon cooling through the critical temperature, the material breaks up into bands, visible as the twin structures associated with martensitic reactions.…”

Section: Introductionmentioning

confidence: 96%

“…These alloys have received attention due to observed shape memory effects as well as high mechanical damping. Work has been done on single crystals [2][3][4][5][6][7], polycrystals of varying composition [8,9] and on thin films [10]. The crystallography of this system has been explored in detail [11] and the transformation in single crystals has been studied via video photography and X-ray methods [12,13].…”

Section: Introductionmentioning

confidence: 99%

Internal friction due to negative stiffness in the indium–thallium martensitic phase transformation

Jaglinski¹,

Frascone²,

Moore³

et al. 2006

Philosophical Magazine

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Internal friction and dynamic shear modulus in an indium-21 at.% thallium alloy were measured as functions of frequency and cooling rate using broadband viscoelastic spectroscopy during the martensitic transformation which occurs in this material occurs around 50 C. Microstructural evolution of martensitic bands was captured using time-lapse optical microscopy. The amplitude of damping peaks due to the temperature-induced transformation in the polycrystalline alloy was found to exceed those reported by others for single crystals of similar alloy compositions, in contrast to the usual reduction in damping in polycrystals. The high temperature portion of the damping peak occurs before martensitic bands are observed; therefore this portion cannot be due to interfacial motion. Constrained negative stiffness of the grains can account for this damping, as well as for amplification of internal friction peaks in these polycrystals and for sigmoid-shaped anomalies in the shear modulus at high cooling rates. Surface features associated with a previously unreported pre-martensitic phenomenon are seen at temperatures above martensite-start.

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“…In-Tl alloys. -We only mention these alloys For the bcc-hcp transition, the indication from as excellent neutron candidates because of the work below the transformation (in the hcp phase) is of a of Gunton and'saunders [24] and Murakami [25]. The pronounced softening of C,, [15].…”

Section: Neutron Studies Of Pretransitional Fluctuations Above Structmentioning

confidence: 99%

Neutron Studies of Pretransitional Fluctuations Above Structural Transitions in Metals

Moss

1977

J. Phys. Colloques

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Resume. -Les transitions de phase structurales dans les metaux 3-d mettent en jeu des transformations simples (de Burgers) entre les structures bien connues, cfc, cc, hc, et la phase mktastable omiga. Ces changements cristallographiques sont accompagnks de cisaillements macroscopiques variks et de deplacements microscopiques dependant du type de changements de symktrie mis en jeu. La plupart de ces transitions sont du ler ordre, cependant, et l'on continue de chercher jusqu'8 quel point on peut decrire de tels changements de phase sur la base d'une dynamique de rbseau. La diffraction de neutron, associke aux etudes de rayons X, est en principe l'outil ideal pour attaquer ce problkme, et on a mis en evidence dans certains de ces systemes, l'existence de mode mou etlou de fluctuations prktransitionnelles. Cependant, la majoritk de ces systkmes ne prksentent pas de comportement de mode mou dramatique, comme il se manifeste, par exemple, dans Nb3Sn, et dans de nombreux cas, la rkponse dynamique de r6seau apparait normale. I1 est fait aussi brikvement allusion 8 I'influence des defauts sur la diffusion des neutrons.Abstract. -Structural phase transitions in (3-D) metals usually involve simple (Burgers) transformations among the well known structures, fcc, bcc, hcp and metastably, the omega phase. Accompanying these crystallographic changes are various macroscopic shears and microscopic shuffles depending upon what kinds of symmetry changes are ultimately involved. Most of the transitions are first order, however, and it has been of continuing interest to explore the extent to which a lattice dynamical basis can be given to such phase changes. Neutron scattering, coupled with X-ray studies, is in principle an ideal tool for looking at this problem and limited evidence exists for mode softening and/or pretransitional fluctuations in some of these systems. The majority of systems do not, however, exhibit dramatic soft mode behavior, as is seen, for example, in Nb3Sn, and in many cases the lattice dynamical response appears normal. The influence of defects on the neutron scattering is also briefly alluded to.

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The elastic behaviour of In-Tl alloys in the vicinity of the martensitic transition

Cited by 98 publications

References 3 publications

Martensitic phase transition with two-component order parameter in a stressed cubic crystal

Martensitic phase transition with two-component order parameter in a stressed cubic crystal

Internal friction due to negative stiffness in the indium–thallium martensitic phase transformation

Neutron Studies of Pretransitional Fluctuations Above Structural Transitions in Metals

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