Effects of Heat Treatment and Oxygen Content on Martensitic Transformation Temperature in Near Equiatomic TiPd Alloys

Yoshiro, Shugo

doi:10.4028/www.scientific.net/msf.56-58.631

Cited by 12 publications

(5 citation statements)

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“…Ti-Pd phase diagram assessed by Murray 2) shows that the homogeneity range is from 47 to 53 at%Pd and displays no significant variation with temperature on the both sides. On the other hand, a profile of the phase boundary TiPd compound reported by Shugo 3) is completely different. That is, the phase boundary at Pd-rich side is around 50 at%Pd and is almost independent of temperature, whereas the boundary at Ti-rich side is about 47.5 at%Pd at 1073 K and abruptly varies to 49 at%Pd at 973 K. A similar result has been obtained at both Ti and Pd-rich sides by Nishida et al 4) We made preliminary investigation on the phase diagram of Ti-Pd alloy, especially for the homogeneity range of TiPd phase.…”

Section: Introductionmentioning

confidence: 89%

Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloys

Solomon

Nishida

2002

Mater. Trans.

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A systematic study on martensitic transformation in Ti-rich Ti-Pd alloys has been carried out using differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The alloys quenched from the single region of B2 parent phase show a successive transformation during DSC measurement. On the other hand, the furnace-cooled alloys show a single transformation. The successive transformation behavior is closely related to the formation of fine Ti 2 Pd precipitates with C11 b -type structure during transformation cycle. The first peak on DSC heating curve is attributable to the reverse martensitic transformation of the TiPd matrix, while the second one is due to the reverse martensitic transformation in local regions around the Ti 2 Pd precipitates where Pd concentration is higher than that in matrix. Morphological characteristics of the precipitate are also discussed.

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Section: Introductionmentioning

confidence: 89%

Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloys

Solomon

Nishida

2002

Mater. Trans.

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“…The first stage of precipitation is the formation of the Ni 4 Ti 3 phase. At the concentration 50.8at%Ni, the precipitation rate is the highest around 400°C [15]. During furnace cooling this critical temperature region is probably passed through slowly enough to allow precipitation.…”

Section: Resultsmentioning

confidence: 99%

“…The reason lies in the fact that oxygen, carbon and nitrogen are almost insoluble in TiNi. Oxygen contents higher than 0.045 at% thus lead to the formation of the Ti 4 Ni 2 O x oxides, giving rise to embrittlement of the alloy [14,15].…”

Section: Resultsmentioning

confidence: 99%

Metal Injection Moulding of Superelastic TiNi Parts

Bidaux

Hidalgo

Girard

et al. 2016

KEM

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Abstract. TiNi shape-memory properties are successfully used today for the fabrication of various technical devices. The limited machinability and high cost of TiNi encourage the use of near-net shape production techniques such as metal injection moulding. In this work TiNi alloys tensile test specimens are produced by metal injection moulding from pre-alloyed powders. A binder based on a mixture of polyethylene, paraffin wax and stearic acid is used. Parts with a density of about 96.6% of theoretical density are obtained. Scanning electron microscopy coupled with EDX measurements reveals a microstructure consisting of a TiNi matrix with small Ti 4 Ni 2 O x and TiC inclusions. DSC and X-ray diffraction observations indicate the presence of additional Ni 4 Ti 3 precipitates. The parts exhibit full superelasticity at room temperature even for strains of up to 4%, without the need for additional thermal post-treatments. Ultimate tensile strengths up to 980 MPa are obtained.

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“…It is worth to mention here that the presence of oxygen was found to promote the formation of Ti 4 Pd 2 O phase along with the Ti 2 Pd 3 phase [8]; the formation of Ti 4 Pd 2 O always leave the matrix with excessive Pd that led to the formation of Ti 2 Pd 3 phase. In the present investigation none of the observed peaks were close to the ideal peaks of Ti 4 Pd 2 O phase except the peak near at 2θ=38.74º (Figs.…”

Section: Thermec 2013mentioning

confidence: 88%

X-Ray Diffraction Studies on Ti-Pd Shape Memory Alloys

Arockiakumar¹,

Takahashi²,

Takahashi³

et al. 2014

MSF

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The phase transformation behavior of Ti-50Pd-5x (x =Zr, Hf, V, Nb, Ta, Cr, Mo, W) (at.%) alloys was studied by X-ray diffraction measurements from room temperature to 800 oC. In all the alloys, B19 martensite was observed at room temperature and it transformed to B2 phase upon heating. In addition, peaks corresponding to formation of (Ti, x)2Pd3 phase was seen for all the alloys. However, the temperature of formation of (Ti, x)2Pd3, interestingly, varied with respect to the elements group from the periodic table. Elements except from group IV (Zr and Hf) have been identified to accelerate the formation of (Ti, x)2Pd3 phase even at low temperatures (~400 oC).

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Effects of Heat Treatment and Oxygen Content on Martensitic Transformation Temperature in Near Equiatomic TiPd Alloys

Cited by 12 publications

References 0 publications

Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloys

Martensitic Transformation in Ti-Rich Ti-Pd Shape Memory Alloys

Metal Injection Moulding of Superelastic TiNi Parts

X-Ray Diffraction Studies on Ti-Pd Shape Memory Alloys

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