Effects of Thermomechanical Treatment on Phase Transformation of the Ti50Ni49W1 Shape Memory Alloy

Huang, Tyau-Song; Ou, Shih-Fu; Kuo, Cheng-Hsien; Yang, Cheng‐Hsien

doi:10.3390/met10040527

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…Equation 2 is used to calculate the shape memory effect (SME) [9]. Figure 9 shows the shape memory effect of samples with respect to different iron content.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour

et al. 2023

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In this research work, the effect of Fe additions on the phase evolution, microstructure, chemical composition, transformation behaviour and properties of Ni (50−X) Ti 50 Fe X shape memory alloys has been investigated. The elemental Ti, Ni and Fe mixed powders are compacted at 600 MPa, followed by sintering at 1100°C for 4hr in an Ar atmosphere. Phase analysis and microstructural studies confirmed the presence of the NiTi phase besides other Ni-rich and Ti-rich phases. The 8at.-% Fe sample shows higher relative density, lower porosity, higher hardness, higher elastic modulus and higher wear resistance owing to the presence of a higher amount of secondary intermetallic phases compared to other composition samples. Interestingly, the 4at.-% Fe sample has a higher percentage of NiTi (B19') phase and shows a better shape memory effect and elastic recovery than other composition samples. FESEM morphology of worn surface explained various wear mechanisms with respect to shape memory behaviour.

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“…Equation 2 is used to calculate the shape memory effect (SME) [9]. Figure 9 shows the shape memory effect of samples with respect to different iron content.…”

Section: Resultsmentioning

confidence: 99%

“…The B2 ↔ B19’ transformation temperature (i.e. the martensitic transformation temperature, Ms) is affected by the presence of dopants such as V, Cr, Co, Mn and Fe (the dopants generally replace the Ni atom in the lattice) [7–10]. The transformation sequence B2 → R → B19’ for NiTi-based alloys, i.e.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour

et al. 2023

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“…However, in contrast to work [15], the intensive growth of the usable strength occurs during the first 100 cycles, not 25. This can be explained by a different composition of the alloy with SME, namely, the presence in the alloy, in addition to 50 % Ti and 49 % Ni, also 1 % W [15]. Thus, it is important to note that our research results are limited by the elemental composition of the VSP-1 alloy (Table 1).…”

Section: Improvement Of the Steam Trap Designmentioning

confidence: 89%

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Pylypchak,

Epifanov,

Patsurkovskyi

et al. 2024

EEJET

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The object of research is the deformation-force characteristics of spring elements of thermostatic steam traps with the shape memory effect. The research solves the problem related to the imperfection of the design of steam traps controlling elements and their high inertia. Experimental studies on the impact of the spring force elements cooling rate on the deformation-force characteristics were conducted. Experimental studies showed that the significant impact of the spring force elements cooling rate on the deformation-force characteristics is observed exceptionally under the deformation mode at a temperature t ≤ Мf. Based on the results of the experiments, it was found that decreasing the cooling rate from 66.7 to 0.013 °C/s has a positive effect on the spring element deformation-force characteristics. Distinctive feature of the work is the study of winding pitch and thermal force cycling impact on the deformation-force characteristics of spring elements. It was found that using thermal force cycling makes it possible to reduce the force required for complete compression of the spring element by 60 %. Intensive decrease in the force required for the complete compression of the spring elements occurs during the first 100 thermal force cycles. The rational method for spring elements heat treatment has been given. It is based on the next steps: heating to a temperature of 400–500 °C for 1 hour; exposure at this temperature for an hour; cooling with rate 0.013 °C/s, the number of thermal force cycles is at least 100 with a winding pitch of 8·10–3 m. Based on research results, an improved design of thermostatic steam trap with controlling element in the form of cylindrical compression spring made of the VSP-1 alloy based on nitinol has been presented

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“…The DSC analyses of powder mixtures have been carried out with a 10°C min −1 heating rate under an Ar atmosphere. The indentation technique is used for shape memory effect measurement using the Vickers hardness equipment with a 1000 gf load for 10 s. Then the sample is heated in a vacuum furnace up to 100°C, held for 30 min, and cooled in a furnace to measure the shape recovery [32]. The wear test of alloy samples was determined by a ball-on-plate wear testing equipment (Model: TR-208-M1, Make: Ducom) in Si 3 N 4 ceramic ball with 30 N load at 30 rev min −1 sliding speed for 10 min time [21, 24].…”

Section: Methodsmentioning

confidence: 99%

Effect of Fe addition on phase evolution, microstructure and properties of Ti₅₀Ni_50-XFe_X alloy

Parida

Mishra

Behera

2023

Materials Science and Technology

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The work aims to study the effect of the Fe content on the properties of Ti50 Ni(50− X) Fe X alloy (where X = 0, 2, 4, 6, 8, and 10 at.-%) sintered at 1050°C and 1150°C using the conventional sintering technique. The microstructure, chemical composition and phase evolution of the sample were analysed by SEM, EDS, and XRD, respectively, along with various properties. It was observed that the sintered sample microstructure consists of (Ni, Fe)-rich, and Ti-rich phases. Here, the porosity decreases, whereas density, hardness, and wear resistance increase with the increasing temperature. The 8at.-%Fe sample shows lower porosity and higher wear resistance, relative density and hardness value than other Fe content samples. The 2at.-%Fe sample sintered at 1050°C shows a higher shape recovery value compared to other compositions sintered at various temperatures.

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Effects of Thermomechanical Treatment on Phase Transformation of the Ti50Ni49W1 Shape Memory Alloy

Cited by 8 publications

References 27 publications

Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour

Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Effect of Fe addition on phase evolution, microstructure and properties of Ti₅₀Ni_50-XFe_X alloy

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Effects of Thermomechanical Treatment on Phase Transformation of the Ti50Ni49W1 Shape Memory Alloy

Cited by 8 publications

References 27 publications

Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour

Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour

Improving the thermostatic steam trap characteristics using spring elements with the shape memory effect

Effect of Fe addition on phase evolution, microstructure and properties of Ti50Ni50-XFeX alloy

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Effect of Fe addition on phase evolution, microstructure and properties of Ti₅₀Ni_50-XFe_X alloy