The effects of cold rolling on the martensitic transformation of an equiatomic TiNi alloy

Lin, Hung-Yin; Wu, S.K.; Chou, T. S.; Kao, H. P.

doi:10.1016/0956-7151(91)90177-3

Cited by 223 publications

(131 citation statements)

References 25 publications

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“…There existed a discrepancy in the dominant twinning modes in the cold worked martensite. Lin et al [6] suggested that no twinning mode changed in the deformed martensite; Madangopal and Rajarshi [7] reported that (011) Type I twin related parallel plates were the typical microstructure of the TiNi alloy cold worked to 30% deformation in the martensitic condition. Koike et al [8] found a small volume fraction of amorphous phase and 011 Type II twin existing in the 30% thickness reduced TiNi alloy.…”

Section: Introductionmentioning

confidence: 99%

The microstructure and linear superelasticity of cold-drawn TiNi alloy

Zheng

Huang

Zhang

et al. 2000

Materials Science and Engineering: A

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The microstructure and linear superelasticity of cold-drawn TiNi alloy have been investigated using CTEM, HREM and in-situ transition electron microscopy observations and tensile tests. The microstructural evolution procedure of the martensite variants with increasing degree of area reduction was found to be that the quantities of (111( ) Type I, (001) compound, (011) Type I and (111) Type I twinning plates increase gradually with decreasing the amount of the 011 Type II twinning bands. The corresponding dominant deformation mechanism changed from the coalescence of martensite variants to the reorientation of substructural bands inside martensite variants utilizing the most favorably oriented twin systems. The intrinsic reason for the linear superelasticity of the moderately cold-drawn TiNi alloy was confirmed to be associated with the appearance and disappearance of (001) microtwinning inside the 011 Type II substructural bands.

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Section: Introductionmentioning

confidence: 99%

The microstructure and linear superelasticity of cold-drawn TiNi alloy

Zheng

Huang

Zhang

et al. 2000

Materials Science and Engineering: A

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“…1,6) It has been suggested that reorientation of martensite variants and introduction and rearrangement of defects caused by the deformation are responsible for this effect. entation of martensite variants via deformation releases internal elastic energy stored in the self-accommodating thermal martensite 2) and, on further deformation, creates an internal elastic stress filed in the direction of the reoriented martensite.…”

Section: Stabilisation Of Martensite Due To Ferroelastic Cyclingmentioning

confidence: 99%

“…This stabilisation effect has been observed after deformation via either martensite reorientation or stress-induced martensitic transformation, for shape memory alloys including NiTi, NiTiNb and CuZnAl, [1][2][3][4][5] in specimens of both single crystals and polycrystalline materials.…”

Section: Introductionmentioning

confidence: 99%

“…1,6) The stabilisation effect is generally observed to manifest in three aspects. (1) The critical temperature for the first reverse transformation after the deformation is increased relative to the undeformed martensite formed by cooling.…”

Section: Introductionmentioning

confidence: 99%

“…(1) The critical temperature for the first reverse transformation after the deformation is increased relative to the undeformed martensite formed by cooling. [1][2][3][4][5] (2) The endothermic heat associated with the reverse transformation has been measured to have increased in the case of simple shear deformation by martensite reorientation 4) or decreased in the case of cold rolling or tensile deformation via stress-induced martensitic transformation. 3,6) (3) A two-way memory effect is developed after the deformation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Ferroelastic Cycling via Martensite Reorientation on the Transformation Behaviour of Nickel-Titanium

2002

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It has been observed that deformation stabilises martensite in a number of shape memory alloys, as evidenced by the increase of the critical temperature for the reverse transformation of the deformed martensite as compared to undeformed martensite. Some hypotheses have been proposed in the literature to explain this phenomenon, including the pinning effect of deformation-induced defects and the release of internal elastic energy stored in thermal martensite. This study continues the experimental work by studying the effect of ferroelastic cycling via martensite reorientation on the transformation behaviour of a binary near-equiatomic NiTi, with the aim to provide further experimental evidence for the clarification of the mechanisms responsible for this effect. It was observed that the critical temperature and the heat of the reverse transformation of oriented martensite increased progressively with deformation cycles, although the limits of the deformation cycles remained unchanged.

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Effect of Cold Work on the Behavior of NiTi Shape Memory Alloy

Mitwally

Farag

2009

Ceramic Transactions Series

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The effects of cold rolling on the martensitic transformation of an equiatomic TiNi alloy

Cited by 223 publications

References 25 publications

The microstructure and linear superelasticity of cold-drawn TiNi alloy

The microstructure and linear superelasticity of cold-drawn TiNi alloy

Effect of Ferroelastic Cycling via Martensite Reorientation on the Transformation Behaviour of Nickel-Titanium

Effect of Cold Work on the Behavior of NiTi Shape Memory Alloy

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