Crystallographic similarities in shape memory martensites

Saburi, Toshio; Wayman, C.M.

doi:10.1016/0001-6160(79)90186-x

Cited by 252 publications

(105 citation statements)

References 17 publications

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“…It remains to be determined whether this fivefold group is due to strain self-accomr:lOdation or accidental internal twinning. However, it is clear that this particle, just as the other groups and single precipitates observed, has near-equilibrium shape conforming to the symmetry of the Wulff plot [31].…”

Section: Symmetry Of Precipitate Shapes and Distributionsmentioning

confidence: 53%

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Recent TEM studies of precipitate growth mechanisms

Westmacott

Dahmen

1986

Rev. Phys. Appl. (Paris)

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Section: Symmetry Of Precipitate Shapes and Distributionsmentioning

confidence: 53%

“…There are only three variants of Ge needles because they share many -20-of the matrix symmetries. Thus different variants are generated only by those symmetry operations of the matrix that are not shared by the precipitate [31].…”

Section: Symmetry Of Precipitate Shapes and Distributionsmentioning

confidence: 99%

Recent TEM studies of precipitate growth mechanisms

Westmacott

Dahmen

1986

Rev. Phys. Appl. (Paris)

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“…This structure is also called as a diamond-shaped morphology in P-phase CuZnAl alloys which produce the martensites which have the long period stacking order structure. In a self-accommodating morphology, six kinds of variant groups are generated from a single crystalline PI phase and each of them consists of four different variants, each of which contains four C5-320 JOURNAL DE PHYSIQUE IV cooperating martensite variants which combined produce nearly zero macroscopic shape change [14,15]. This enables the materials to deform under low stresses by means of variant coalescence, and this is also an important necessity to provide the SME.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Ageing on Martensite Morphology in Shape Memory CuZnAl Alloys

1997

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Abstract, The martensitic transformation behaviour, morphology and microstructures in copper-based shape memory alloys are strongly influenced by the post-quench heat treatments and ageing. Martensitic transformation initiates at a critical temperature and grows by the formation of martensite variants on cooling up to martensite finish temperature. These alloys are metastable at the matrix p-phase condition, and reversibility of transformation and formation of martensite variants from the matrix are related to the elementary mechanisms. The interfacial motion between martensite variants is also important in shape memory. Vickers hardness shows a trend to increase with holding duration at ageing temperature of 200°C for both alloys. Martensite plates have similar morphology in as-quenched and post-quench heat treated specimens, and growth units of two or four plates constitute selfaccommodating systems.

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“…For Cu-Zn-Al alloys four type of characteristics are used. The first one determined by Saburi et al [7] gives a negative volume change associated to the transformation and the second one due to De Vos et al [8] gives a positive one. In order to test the influence of this volume change on the behavior dissymmetry a transformation without any volume change is also used.…”

Section: Numerical Datamentioning

confidence: 99%

Determination of the Origin for the Dissymmetry Observed between Tensile and Compression Tests on Shape Memory Alloys

et al. 1995

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: Experimental observations performed on polycrystalline Cu-based Shape memory alloys exhibit assymmetrical responses for tensile or compressive test. We used a micromechanical point of view to determine the physical origin of this dissymmetry. At first approximation, we assume that the stress field is uniform inside the material and equals to the applied stress. This modelling gives some differences in the transformation slope and in the transformation strain associated to these two loading conditions. Using this approach we established that the volume change associated to the phase transformation exerts no influence upon this phenomenon. It appears that the low symmetry of the martensite is the major physical origin of this asymmetry. Finally, we improve the accuracy of these results using a self-consistent approach to determine the macroscopic behavior from the definition of the local constitutive equations. This modelling is able to determine the internal stress field developed by the phase transition. This approach gives different critical transformation stress and different hysteresis size for tensile or compressive test. Results obtained by this modelling are in good agreement with experimental features observed on Cu-based Shape Memory alloys. Multiaxial loading are then numerically performed and used to determine a macroscopic transformation criterion.

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Crystallographic similarities in shape memory martensites

Cited by 252 publications

References 17 publications

Recent TEM studies of precipitate growth mechanisms

Recent TEM studies of precipitate growth mechanisms

The Influence of Ageing on Martensite Morphology in Shape Memory CuZnAl Alloys

Determination of the Origin for the Dissymmetry Observed between Tensile and Compression Tests on Shape Memory Alloys

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