Quaternary alloying of copper with Ti50Ni25Pd25 high temperature shape memory alloys

Rehman, Saif Ur; Khan, Mushtaq; Khan, A. Nusair; Ali, Liaqat; Jaffery, Syed Imran Husain; Khurram, Muhammad

doi:10.1016/j.msea.2019.138148

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…In the 15Ta alloy, transformation temperatures usually lead irreversible plastic deformation due to low critical stress for slip deformation. 3,40,41) In these alloys, the microstructure is composed of the matrix and the fine particles of the ¢ phase or lamellae of the matrix and the ¢ phase. The slip in the ¢ phase was possibly suppressed by the fine grain size of the ¢ phase, while the slip in the matrix can be suppressed by solidsolution strengthening and/or severe lattice distortion by adding various elements with different atomic radius.…”

Section: Constituent Phases and Transformation Temper-mentioning

confidence: 99%

Development of Ni–Ti–Zr–Hf–(Nb, Ta) Multi-Principal Element High-Temperature Shape Memory Alloys with High Cold Workability

Tasaki,

Arai,

Miyazaki

et al. 2023

Mater. Trans.

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Novel Ni-Ti-Zr-Hf-Nb and Ni-Ti-Zr-Hf-Ta high temperature shape memory alloys with multi-principal elements were developed, and differences in the effects of Nb and Ta on cold workability and shape memory properties were investigated. Constituent phases, microstructure, cold workability, transformation temperatures, shape memory properties were investigated in (Ni 50 Ti 30 Zr 10 Hf 10 ) 100¹x Nb x (x = 5, 10, 15) alloys and (Ni 50 Ti 30 Zr 10 Hf 10 ) 100¹y Ta y ( y = 5, 10, 15) alloys. Although both of Nb and Ta were effective to improve cold workability of Ni 50 Ti 30 Zr 10 Hf 10 alloy by forming a ductile ¢ phase with a disordered body-centered cubic structure, it was found that Ta was more effective than Nb in improving cold workability. The addition of Ta was also effective to suppress the formation of Ti 2 Ni-type intermetallic compound. Transformation temperatures were not significantly affected by the addition of Nb, while the transformation temperatures increased by the addition of Ta. According to thermal cycling tests, the (Ni 50 Ti 30 Zr 10 Hf 10 ) 85 Nb 15 , (Ni 50 Ti 30 Zr 10 Hf 10 ) 90 Ta 10 and (Ni 50 Ti 30 Zr 10 Hf 10 ) 85 Ta 15 alloys exhibited almost full shape recovery under 200 MPa. These alloys are suggested as promising candidates for practical high temperature shape memory alloys that can be worked at room temperature.

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Section: Constituent Phases and Transformation Temper-mentioning

confidence: 99%

Development of Ni–Ti–Zr–Hf–(Nb, Ta) Multi-Principal Element High-Temperature Shape Memory Alloys with High Cold Workability

Tasaki,

Arai,

Miyazaki

et al. 2023

Mater. Trans.

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show abstract

“…To improve the microstructure and dimensional stabilities at elevated temperatures many techniques are being used; solid solution strengthening [17][18][19][20], precipitation hardening by aging [21][22] and thermomechanical cycling [22].Strengthening by solid solution methods has been reported by many researchers [13,17,18,20]. Precipitation hardening is the second effective technique widely used to improve the strength of alloys [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Precipitation hardening is the second effective technique widely used to improve the strength of alloys [23][24][25][26]. Shimuzu et al [21] investigated the effect of precipitates and reported that by formation of Ti2Ni precipitates, the shape memory properties improved in TiNiPd alloy containing Ti-rich concentration. Combined effect of two types of precipitates; Ti2Pd and Ti2Ni also studied by Delville [27] in Ti50Ni30Pd20 high temperature shape memory alloy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Aged-TiNiPdCu High Temperature Shape Memory Alloys

Rehman

Khan

Khan³

et al. 2021

KEM

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High temperature ternary Ti50Ni25Pd25 and quaternary Ti50Ni20Pd25Cu5 shape memory alloys were developed in vacuum arc melting furnace using high purity constituent elements. Half numbers of samples were solution treated at 900 °C for 2 hrs and remaining were aged at 600 °C for 3 hrs. Both alloys were characterized for microstructure analysis and mechanical properties. After aging the alloys, no significant change in microstructure was observed in ternary alloy however, fine precipitates of bright color were found along the grain boundaries in quaternary alloy. The mechanical properties of ternary and quaternary alloys were found to be improved significantly. Microhardness of ternary alloy was increased by 18 Hv whereas for quaternary alloy the same property was improved by 24 Hv. Yield stress of ternary and quaternary was observed to be enhanced by 10 MPa and 9 MPa respectively. Similarly the fracture stress was observed to be increased by 9 MPa and 13.4 MPa. Conversely, the fracture strain of ternary and quaternary alloys was reduced by 0.5% and 0.35% respectively. From these results it can be established that aging at 600 °C is beneficial to improve the mechanical properties of both alloys however, quaternary alloy responded more actively as compared to ternary alloy.

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Effect of Cu content on martensitic transformation and shape memory behavior in Ti31.5Hf15Zr5Ni48.5−xCux alloys

Pang,

Dang,

Tian

et al. 2024

J Mater Sci

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Quaternary alloying of copper with Ti50Ni25Pd25 high temperature shape memory alloys

Cited by 11 publications

References 27 publications

Development of Ni–Ti–Zr–Hf–(Nb, Ta) Multi-Principal Element High-Temperature Shape Memory Alloys with High Cold Workability

Development of Ni–Ti–Zr–Hf–(Nb, Ta) Multi-Principal Element High-Temperature Shape Memory Alloys with High Cold Workability

Mechanical Properties of Aged-TiNiPdCu High Temperature Shape Memory Alloys

Effect of Cu content on martensitic transformation and shape memory behavior in Ti31.5Hf15Zr5Ni48.5−xCux alloys

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