Shape memory properties and transformation temperature of Ti50-XVXPt50 alloy

Daswa, Pfarelo; Chikosha, Silethelwe; Siyasiya, Charles Witness

doi:10.1016/j.intermet.2021.107154

Cited by 5 publications

(11 citation statements)

References 10 publications

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“…The Ti50Pt43.75Ni6.25 and Ti50Pt37.5Ni12.5 microstructures, phase transformation temperatures and hardness results were compared to those of Ti50Pt50, Ti50Pt43.75V6.25 and Ti50Pt37.5V12.5 that were previously studied by *Daswa et al [5].…”

Section: Resultsmentioning

confidence: 97%

“…The hardness of the TiPtV [5] and TiPtNi alloys are higher than those of Ti50Pt50 [5] in both the as-cast and solution heat treated conditions as shown in Figure 6.…”

Section: Hardnessmentioning

confidence: 92%

“…This is in agreement with the findings of Daswa et. al [5], where V was reported to increase the transformation temperature of Ti50Pt50 when used to partially substitute for Ti [23]. The martensitic start (Ms) and finish (Mf) temperatures of Ti50Pt43.75V6.25 are lower than those of Ti50Pt43.75Ni6.25 in both the as-cast and solution heat treated conditions.…”

Section: Phase Transformation Temperaturesmentioning

confidence: 99%

“…The martensitic phase transformation temperature of the Ti50Pt50 was found to be 127 and 227 • C higher than those of Ti50Au50 [2][3] and Ti50Pd50 alloys [4] respectively [1]. This therefore makes Ti50Pt50 a potential high temperature shape memory alloy [3][4] [5] [6].…”

Section: Introductionmentioning

confidence: 99%

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The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti₅₀Pt₅₀ alloy

Motsai

Makhatha²,

Camagu³

et al. 2022

MATEC Web Conf.

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Significant research has been done to produce shape memory alloys that have good shape memory properties and high martensitic transformation temperatures. The Ti50Pt50 alloys have been found to have high transformation temperature of around 1050℃ however, they exhibit negligible shape memory properties. The solid solution strengthening, and improved shape memory properties could be enhanced by ternary alloying. Therefore, this work investigates the effect of varying V and Ni contents, in the range of 6.25 to 12.5at%, on the austenitic and martensitic transformation temperatures, and hardness of the equi-atomic Ti50Pt50 alloy. Arc melting followed by casting and solution heat treatment was carried out to produce the alloys. As-produced alloys were characterized by using scanning electron microscopy, differential scanning calorimetry and hardness testing. The microstructures showed high volume fraction of second phases formed in the TiPtV alloy compared with Ti50Pt50 and TiPtNi alloys. The multiple phases formed in the TiPtV alloys could be the cause of high hardness values observed in these alloys as compared withTi50Pt50 and TiPtNi alloys. Thermal transformation studies revealed that TiPtV alloys exhibit transformation temperature close to Ti50Pt50 alloy, in contrast with TiPtNi alloys. TiPtNi alloys thermal behaviour was improved by solution heat treatment.

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Section: Resultsmentioning

confidence: 97%

“…The hardness of the TiPtV [5] and TiPtNi alloys are higher than those of Ti50Pt50 [5] in both the as-cast and solution heat treated conditions as shown in Figure 6.…”

Section: Hardnessmentioning

confidence: 92%

Section: Phase Transformation Temperaturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti₅₀Pt₅₀ alloy

Motsai

Makhatha²,

Camagu³

et al. 2022

MATEC Web Conf.

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“…SMAs used in high temperature applications (HTSMAs) undergo phase transformation at temperatures above 117℃ compared to low temperature SMAs (LTSMAs) that transform at lower temperatures. 𝑇𝑇𝑇𝑇 50 𝑃𝑃𝑃𝑃 50 alloy is characterized as a HTSMA [4][5] as it undergoes thermoselastic martensite phase transformation around 1050℃ [6] with reportedly high austenite finish (A f ) temperature above 1000℃ [6][7]. However, Ti 50 Pt 50 alloys exhibit small shape memory effects and very low strength in the high temperature (B2) phase [6][7] as a result of low critical stress for slip deformation than that needed for martensitic transformation [7].…”

Section: Introductionmentioning

confidence: 99%

The effect of increasing hafnium on the microstructure, phase transformation temperatures and hardness of TiPtHf potential shape memory alloys

Moletsane,

Motsai,

Makhatha

et al. 2023

MATEC Web Conf.

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Shape Memory Alloys (SMAs) are popular due to their ability to regain their original shape after plastic deformation. Binary TiPt alloys have low shape memory effects and as such, alloying elements are added to improve these properties. The effect of alloying and increasing the Hf in binary Ti50Pt50 to form ternary Ti50Pt50−xHfx (x=6.25,12.5 and 18,25 at.%) on the microstructure, transformation temperatures and hardness in the as cast and solution heat treatment conditions were investigated. In the as-cast condition SEM EDS analysis showed that alloying with Hf resulted in the formation of dark grey interdendritic regions comprised of Ti-rich phases and the increase in Hf content (at. %) led to an increase in the size of these interdendrites. Solution heat treatment (SHT) of the alloy led to a decrease in the size of the dark grey interdendritic regions and the formation and increase of dark black regions with increasing Hf content (at. %). Differential scanning calorimetry showed that partial substitution of Pt with 6.25 at. % Hf decreased the transformation temperature of the alloy below that of Ti50Pt50 in both conditions. Increase in to Hf 12.5 and 18.25 at. % increased the transformation temperatures above those of Ti50Pt50 binary alloy in both conditions. SHT of 12.5 at. % Hf significantly reduced the AS and MS temperatures. Alloying and increase in Hf content (at. %) increased the hardness of the alloys above that of Ti50Pt50. SHT increased the hardness of the alloys above that of Ti50Pt50 and the as-cast alloys.

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Platinum-Based Superalloys: Combating High Temperatures and Aggressive Environments

Cornish

2022

The Minerals, Metals &Amp; Materials Series

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Shape memory properties and transformation temperature of Ti50-XVXPt50 alloy

Cited by 5 publications

References 10 publications

The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti₅₀Pt₅₀ alloy

The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti₅₀Pt₅₀ alloy

The effect of increasing hafnium on the microstructure, phase transformation temperatures and hardness of TiPtHf potential shape memory alloys

Platinum-Based Superalloys: Combating High Temperatures and Aggressive Environments

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Shape memory properties and transformation temperature of Ti50-XVXPt50 alloy

Cited by 5 publications

References 10 publications

The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti50Pt50 alloy

The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti50Pt50 alloy

The effect of increasing hafnium on the microstructure, phase transformation temperatures and hardness of TiPtHf potential shape memory alloys

Platinum-Based Superalloys: Combating High Temperatures and Aggressive Environments

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Product

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The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti₅₀Pt₅₀ alloy

The effect of vanadium and nickel on the microstructure and transformation temperatures of Ti₅₀Pt₅₀ alloy