A study of B2↔B19↔B19′ two-stage martensitic transformation in a Ti50Ni40Cu10 alloy

Lo, Yih‐Hsing; Wu, S.K.; Horng, Herng-Er

doi:10.1016/0956-7151(93)90007-f

Cited by 113 publications

(59 citation statements)

References 30 publications

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“…1) Among ternary TiNi-based SMAs, Ti 50 Ni 50Àx Cu x SMAs with x 5 30 at%, have been extensively examined from various aspects, such as the shape memory effect, [2][3][4] martensitic transformation behaviors, [5][6][7][8] mechanical characteristics, [9][10][11] microstructures, [12][13][14][15][16][17] internal friction, [18][19][20][21][22][23][24][25][26] etc. The transformation sequences of Ti 50 Ni 50Àx Cu x SMAs are B2 !B19 0 , B2 !B19 !B19 0 and B2 !B19 for x < 5, 5 5 x 5 20 and x > 20 at%, respectively.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti50Ni40Cu10 Shape Memory Alloy by Dynamic Mechanical Analyzer

Lin

Tsai

2008

Mater. Trans.

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The effect of thermal cycling on B2!B19!B19 0 transformations of cold-rolled and annealed Ti 50 Ni 40 Cu 10 SMA was examined by DMA. Experimental results point out the transformation peak temperature and its tan peak value of B19!B19 0 transformation are more suppressed by thermal cycling than those of B2!B19. This is because of the different microstructures between B19 and B19 0 martensites in which B19 is a defect-free martensite but B19 0 has plenty of twinning. Dislocations induced by thermal cycling can hinder the mobility of twin boundaries of B19 0 martensite and cause different thermal cycling effects on B2!B19 and B19!B19 0 transformations. Thermal cycling also shows an obvious effect on storage modulus E 0 values of B19 and B19 0 martensites and their E 0 values increase with increasing thermal cycles.

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Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti50Ni40Cu10 Shape Memory Alloy by Dynamic Mechanical Analyzer

Lin

Tsai

2008

Mater. Trans.

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“…Multiple martensitic transformations can occur in shape memory alloys for several reasons. Their origin can be attributed to the appearance of two different kinds of martensite [3] or to some microstructures such as a bimodal grain size distribution after crystallization of the partly amorphous ribbons [4]. This transformation temperature can also be locally modified inside a grain because of the presence of dislocations walls [5] or coherent precipitation [6], which can either promote the transformation or can act as a barrier.…”

Section: Introductionmentioning

confidence: 99%

Multiple martensitic transformation induced by coherent precipitation in NiTiCo melt spun ribbons

Vermaut

Larnicol

Hÿtch³

et al. 2001

J. Phys. IV France

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Abstract.A study of a multiple martensitic transformation observed in melt spun ribbons cast with a relatively low melt temperature is presented. Transmission electron microscope (TEM) investigations allow the identification of fine plate-like precipitates as a metastable Ti2Ni phase. Analysis of high resolution microscope (HREM) images reveals the presence of a strain field in the matrix surrounding the precipitates which promote the martensitic transformation. Grow and loss of coherency of these precipitates coincides with disappearance of the higher temperature martensitic transformation. Attribution of the multiple transformation to this precipitation is discussed.

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“…7,9,14,15,17,19,23,30,[45][46][47][48][49][50][51][52][53]. Remaining questions to be answered are: a) the origin of the non-thermally activated peaks P 150K and P 200K and b) the role of H in the local strain glass transition.…”

Section: H-contaminated Materialsmentioning

confidence: 99%

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

Mazzolai¹

2011

AIP Advances

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This review is focused on the influence of interstitial hydrogen and alloy compositional changes on the internal friction (IF) spectrum and elastic Young's modulus (E) of NiTi based shape memory alloys. In the martensitically transforming binary alloys Ni50+xTi50-x (x≤1.3) vacuum annealed and furnace cooled (H-free), besides the well known IF peak associated with the martensitic transition two additional non-thermally activated peaks (P150K and P200K′) are present due to some sort of second-order phase transitions. In martensitically transforming Ni50+xTi50-x and Ti50Ni50-yCuy alloys doped with hydrogen two thermally activated peaks, PTWH and PH, appear which originate from stress-assisted motions of H-twin boundary complexes and isolated H-elastic dipoles (Snoek effect), respectively. In a H-free martensitically non-trasforming alloy (x=2), besides the non-thermally activated peak P150K, a frequency dependent dip is observed in the E(T) curves at a temperature Tg. This dip is similar to that reported in the literature for two other non-transforming alloys (x=1.5 and x=2.5), which, however, were also found to exhibit a thermally activated IF peak just below Tg. Most likely, these two alloys were contaminated with hydrogen during the preliminary solubilization in argon atmosphere and subsequent water quenching treatments given to them. The Young's modulus dip and the lower temperature IF peak have been both attributed to a novel type of phase transition reported in the literature as “strain glass transition”. The introduction of hydrogen into the non-transforming alloy with x=2 enhances the Young's modulus dip and gives rise to the H-Snoek peak PH just below Tg, which clearly appears to be the counterpart of the peak observed in the alloys (x=1.5 and x=2.5) solubilized in argon atmosphere and water quenched. The conclusion was reached in the present work that this last peak is not related to the strain glass transition but is rather an H-Snoek relaxation

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A study of B2↔B19↔B19′ two-stage martensitic transformation in a Ti50Ni40Cu10 alloy

Cited by 113 publications

References 30 publications

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

Multiple martensitic transformation induced by coherent precipitation in NiTiCo melt spun ribbons

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

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A study of B2↔B19↔B19′ two-stage martensitic transformation in a Ti50Ni40Cu10 alloy

Cited by 113 publications

References 30 publications

The Effect of Thermal Cycling on B2&rarr;B19&rarr;B19&prime; Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

The Effect of Thermal Cycling on B2&rarr;B19&rarr;B19&prime; Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

Multiple martensitic transformation induced by coherent precipitation in NiTiCo melt spun ribbons

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

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Product

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The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer