The effect of vanadium on structure and martensitic transformation temperature of TiPt alloy

Chikosha, Silethelwe; Mahlatji, ML; Modiba, R.; Chikwanda, HK

doi:10.1088/1757-899x/430/1/012022

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…The thermal hysteresis (∆T) of the as-cast and solution heat treated Ti50Pt50 is lower than those of the TiPtV and TiPtNi alloys. This could mean that alloying Ti50Pt50 with either V or Ni widens the hysteresis, resulting in low martensitic transformation temperatures, in agreement with As & Af and Ms & Mf values for TiPtV and TiPtNi alloys obtained in study [15]. ∆T of the TiPtV and TiPtNi alloys increases as the vanadium and nickel contents increase in both conditions.…”

Section: Phase Transformation Temperaturessupporting

confidence: 85%

“…This was expected as previous studies showed that partial substitution of Pt with 6.25 at. % V tends to lower the martensitic transformation temperature and suppress the austenite-to-martensite transformation temperature [15]. The opposite is observed with 12.5 at.…”

Section: Phase Transformation Temperaturesmentioning

confidence: 85%

“…This led to a wider transformation thermal hysteresis in Ti50Pt43.75V6.25 alloy (∆T=163 • C) as compared to Ti50Pt50 alloy (∆T=101 • C). Narrow thermal hysteresis is preferable for rapid reaction during actuation [15]. The 60NiTi produced by hot isostatic pressing (HIP) showed that it primarily is composed of the B2 NiTi, Ni3Ti, and metastable Ni3Ti2 phases, with low quantities of Ti2Ni phase.…”

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: Phase Transformation Temperaturessupporting

confidence: 85%

Section: Phase Transformation Temperaturesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Alloying with Hf also increases the density of Ti 50 Pt 50 when substituting Ti with Hf [10]. The use of high Hf contents (at %) by lowering the Pt content (at %) may reduce the high cost associated with 𝑇𝑇𝑇𝑇 50 𝑃𝑃𝑃𝑃 50 SMAs [14][15]. However, the effect on properties has not yet been reported in literature.…”

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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Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures

Zarinejad

Wada

Pahlevani

et al. 2021

Shap. Mem. Superelasticity

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Dependence of Phase transformation temperatures of TiPd-and TiPt-based shape memory alloys on Valence Electron Ratio (VER), number (ev/a), and average atomic number of the alloys (Z) are investigated. The alloys have medium numbers of valence electrons (6.6 ≤ ev/a ≤ 7.3) that are near 7 and a wide range of the average atomic number (Z = 25-54). The forward and reverse phase transformation temperatures, Ms and (As), increase with average atomic number of the alloys, respectively. Clear correlations between transformation temperatures and VER are found. Ms and (As) both decrease from around 1184 ˚C (1175 ˚C) to as low as 20 ˚C (32 ˚C) respectively, with increasing VER from 0.134 to 0.270.Temperature hysteresis of the thermoelastic transformation in these alloys tends to decrease with increasing VER. Dependence of transformation temperatures and temperature hysteresis of these shape memory alloys on VER is discussed based on the variations of elastic moduli and atomic bonding due to composition change.

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The effect of vanadium on structure and martensitic transformation temperature of TiPt alloy

Cited by 4 publications

References 17 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

Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures

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The effect of vanadium on structure and martensitic transformation temperature of TiPt alloy

Cited by 4 publications

References 17 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

Valence Electron Ratio for Design of Shape Memory Alloys with Desired Phase Transformation Temperatures

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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