Martensite-type transformations in platinum alloys

Biggs, T.; Witcomb, M. J.; Cornish, L.A.

doi:10.1016/s0921-5093(99)00371-8

Cited by 25 publications

(26 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…16,17) The investigation of the phase transformation in TiPt suggested a martensitic transformation and its high potential as a hightemperature shape memory alloy. 18,19) As shown above, some intermetallics, including PGMs, show a high martensitic transformation temperature. However, there is very limited research on these intermetallics.…”

Section: Introductionmentioning

confidence: 79%

Mechanical Properties of Ti–50(Pt,Ir) High-Temperature Shape Memory Alloys

et al. 2006

View full text Add to dashboard Cite

To develop high-temperature shape memory alloys, Ti-50(Pt,Ir)mol% compounds are noted because of their martensitic transformation from B2 to B19(2H) or 4H(4O) structures above 1273 K. A thermal expansion measurement and loading-unloading compression test were performed for Ti-50(Pt,Ir) to determine if the shape memory effect or superelasticity was shown. The thermal expansion measurement indicated the shape recovery in some of the compounds. The maximum shape recovery was about 4% by reheating at the above martensite transformation temperature after a loading-unloading compression test. Superelasticity was also observed in ternary compounds. The potential of Ti-50(Pt,Ir) as a high-temperature shape memory alloy is discussed.

show abstract

Section: Introductionmentioning

confidence: 79%

Mechanical Properties of Ti–50(Pt,Ir) High-Temperature Shape Memory Alloys

et al. 2006

View full text Add to dashboard Cite

show abstract

“…In the binary system, the morphology of the B19 TiPt phase was found to depend on the cooling rate after heat treatment (Figures 7 and 8). The effect of nickel has been reported to generally decrease the M s (Figure 9) [6,7]. The transformation temperatures were measured using differential thermal analysis and showed excellent correlation with Lindquist et al [7] who investigated samples of 20 at.% Ni and greater (Figure 9).…”

Section: Platinum-titanium-nickelmentioning

confidence: 60%

“…In the platinum-titanium system a transformation from a B2 structure to a B19 (orthorhombic) structure has been observed around 50 at.% Pt [4,5,6]. The transformation temperature and hardness values vary with composition.…”

Section: Platinum-titanium-nickelmentioning

confidence: 98%

“…No evidence of a cubic B2 or monoclinic B19' TiNi phase was found. Some ternary additions, such as rhenium, have been observed to stabilise the B2 TiPt phase and, in fact, at higher platinum contents, a two-phase region of B2 TiPt and B19 TiPt has been observed [6]. This would imply diffusion is necessary for the transformation, which would render the transformation nonmartensitic.…”

Section: Platinum-titanium-nickelmentioning

confidence: 99%

See 1 more Smart Citation

The effect of nickel on the martensitic-type transformations of Pt₃Al and TiPt

et al. 2001

View full text Add to dashboard Cite

Abstract:The effect of nickel on two classes of martensitic-type transformations in platinum systems has been studied. The first transformation is Ll 2 to DO/ in the Pt 3 Al system and the second is B2 to B19 in the TiPt system. The microstructures after transformation in the two systems are very different. The product of the PtjAl transformation has a twinned microstructure, typical of cubic-to-tetragonal transformations. The product of the TiPt transformation is lath-like, although the morphology can be altered using heat treatments. The parent phase in the TiPt system is not retained at room temperature, whereas the parent phase in the Pt3Al transformation can be stabilised to room temperature.A great variation in hardness and transformation temperature is seen in each system as the composition is varied about the stoichiometric ratio, which has the lowest hardness. The Pt3Al transformation temperature has been reported to range from around room temperature to 1000°C. The TiPt transformation temperature can range from 1000 to 1080°C. The effect of nickel additions on these alloys also has a marked effect on the parent and product phase stability, and hence the microstructure and resulting hardness. The effect on the PtjAl phase is complex, as nickel appears to stabilise the parent phase. The hardness varied in the region of 350 to 500 HV 10 . For the TiPt phase, the hardness values were generally found to increase with the nickel additions increasing from 250 to about 600 HV 10 . The addition of 20 at.% nickel decreases the transformation temperature from around 1000°C to about 600°C.

show abstract

“…Interest of researches in platinum based alloys is constantly growing 1 . These types of alloys are used in: glass industry 2,3 , fertilizer plants [4][5][6] , temperature measurement 7 , environment protection 8 , jewelry production 9,10 , shape memory applications 11,12 and medicine…”

Section: Introductionmentioning

confidence: 99%

Platinum-Based Alloys: Investigation of the Effect of Impurities Content on Creep Rate, Rupture Time and Relative Elongation at High Temperatures

et al. 2017

View full text Add to dashboard Cite

This paper presents the results of research of the effect of impurities content on high-temperature resistance of selected platinum alloys. Alloys of following systems were investigated: Pt-Rh, Pt-Rh-Pd, Pt-Rh-Pd-Ru and Pt-Rh-Pd-Ir-Au. Universal device for tensile testing of materials at high temperatures was used for examination. Investigations were carried out in a temperature range of 1300-1400 °C, with a stress of 5 MPa. It was observed that an increase in content of impurities in tested alloys at high temperatures, and at stated conditions of stress, caused a noticeable increase in creep rate while reducing rupture time and relative elongation. Experimental results confirmed that probability of brittle fracture decreases with decreasing impurity content in the alloys. Binary and multicomponent alloys of Pt-Rh, Pt-Pd-Rh, Pt-Rh-Pd-Ru and Pt-Rh-Pd-Ir-Au systems are primarily used in conditions of high temperature, and accordingly, presented results contribute to a better understanding of their behavior in such working conditions.

show abstract

Martensite-type transformations in platinum alloys

Cited by 25 publications

References 2 publications

Mechanical Properties of Ti–50(Pt,Ir) High-Temperature Shape Memory Alloys

Mechanical Properties of Ti–50(Pt,Ir) High-Temperature Shape Memory Alloys

The effect of nickel on the martensitic-type transformations of Pt₃Al and TiPt

Platinum-Based Alloys: Investigation of the Effect of Impurities Content on Creep Rate, Rupture Time and Relative Elongation at High Temperatures

Contact Info

Product

Resources

About

Martensite-type transformations in platinum alloys

Cited by 25 publications

References 2 publications

Mechanical Properties of Ti&ndash;50(Pt,Ir) High-Temperature Shape Memory Alloys

Mechanical Properties of Ti&ndash;50(Pt,Ir) High-Temperature Shape Memory Alloys

The effect of nickel on the martensitic-type transformations of Pt3Al and TiPt

Platinum-Based Alloys: Investigation of the Effect of Impurities Content on Creep Rate, Rupture Time and Relative Elongation at High Temperatures

Contact Info

Product

Resources

About

Mechanical Properties of Ti–50(Pt,Ir) High-Temperature Shape Memory Alloys

Mechanical Properties of Ti–50(Pt,Ir) High-Temperature Shape Memory Alloys

The effect of nickel on the martensitic-type transformations of Pt₃Al and TiPt