Microstructure, mechanical properties and transformation behavior of friction stir welded Ni50.7Ti49.3 alloy

Deng, Huaibo; Chen, Yuhua; Li, Shuhan; Chen, Chao; Zhang, Timing; Xu, Mingfang; Ji, Di

doi:10.1016/j.matdes.2020.108491

Cited by 17 publications

(4 citation statements)

References 34 publications

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“…The tool made of Densimet with a normal cylindrical probe was utilized for the experimentation [45]. The marks on the welding top surface and root face undoubtedly portrayed different phases of FSW like dwelling/ plunging phase, welding with traverse movement and retraction of the tool [46]. Severe plastic deformation and high temperature helped to refine grains through dynamic recrystallization phenomena.…”

Section: Friction Stir Welding Of Nitinolmentioning

confidence: 99%

A Review on Present Status of Friction Stir Welding of Nitinol, a Functionally Advanced, Versatile and Widely Used Shape Memory Alloy

Datta,

Biswas

2023

Shape Memory Alloys - New Advances

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Ni-Ti alloys are extensively utilized in different fields of manufacturing because of their typical pseudoelastic effect and the shape memory properties. Welding of NiTinol is always essential to manufacture diverse geometrical structures with sufficient design flexibility following the application necessities. NiTinol is susceptible to compositional variations and microstructural changes because of the welding process. As a result, the mechanical and microstructural properties along with other functional properties get deteriorated with time. Welding of NiTinol without melting is extremely substantial because of the avoidance of the volatilization of the compositional constituents. Friction stir welding, a solid-state welding method, satisfies all the vital necessities of NiTinol alloy welding. This chapter will describe the friction stir welding of NiTinol in both similar and dissimilar material combinations in detail. The effect of different welding process variables on mechanical and metallurgical properties will be described along with the description of the smart functionality of the welded structures and the corrosion resistance performance.

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Section: Friction Stir Welding Of Nitinolmentioning

confidence: 99%

A Review on Present Status of Friction Stir Welding of Nitinol, a Functionally Advanced, Versatile and Widely Used Shape Memory Alloy

Datta,

Biswas

2023

Shape Memory Alloys - New Advances

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“…The microstructure consists of equiaxed grains with a B2 austenite phase, and the average grain size of the base metal was 50 ± 4 µm. Nitinol alloy exhibits the shape memory effect and superelasticity because of reversible martensitic transformation (Deng et al, 2020). The Ni content plays a significant role in altering the starting and finishing phase transformation temperatures.…”

Section: Base Metal Microstructurementioning

confidence: 99%

Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol–Nitinol Joints

et al. 2021

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In the present study, a rotary friction process was used to join nitinol in a similar welding combination. Macro- and microstructure characteristics of the weld zone were compared with adjacent zones and the base metal. The hardness and tensile properties of the joints were evaluated, and the results were discussed in relation to the weld microstructure. The weld macrostructure revealed a uniform flash around the circumference of the weld. The optical microstructure of the welded sample revealed fine recrystallized grains at the weld interface due to heavy deformation followed by dynamic recrystallization. The phase transformation behavior of the base metal and welded samples was studied by using a differential scanning calorimeter (DSC). The drift in phase transformation temperatures after rotary friction welding may be attributed to fine grain formation at the weld interface. Friction welded samples exhibited improved yield strength and hardness values compared to the base metal due to grain refinement at the weld interface.

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“…4–6 Recently, the viability of utilizing friction stir welding (FSW) to join NiTi alloy has been demonstrated. 7–9 The FSW was very effective in joining the NiTi alloy with good mechanical strength along with retention of shape memory effect. In FSW, the non-consumable high-strength tool will plunge and stir the edges of the plates to be joined.…”

Section: Introductionmentioning

confidence: 99%

Investigations on the actuation behaviour of friction stir–welded nickel titanium shape memory alloy using continuous fibre laser

Prabu

Palani

2021

Journal of Micromanufacturing

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The friction stir welding (FSW) is found to be an effective solid-state process to join Nickel Titanium (NiTi) shape memory alloy. The retention of shape memory effect has enabled the welded NiTi alloy to be exploited in various functional applications. In this article, the NiTi sheets of 1.2 mm thickness are welded using FSW. The tool selection, geometry design and process parameters required to weld NiTi sheets are explored. Interestingly, an attempt is made to actuate the welded NiTi alloy, using laser actuation technique. The laser beam is scanned over the sample at a particular speed, enabling the increase in temperature suitable for physical actuation. A minimum and maximum displacement of 10 mm and 28 mm are recorded for the laser powers of 10 W and 50 W, respectively. Apart from laser actuation, the dynamic mechanical analysis of the welded NiTi alloy is investigated.

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Microstructure, mechanical properties and transformation behavior of friction stir welded Ni50.7Ti49.3 alloy

Cited by 17 publications

References 34 publications

A Review on Present Status of Friction Stir Welding of Nitinol, a Functionally Advanced, Versatile and Widely Used Shape Memory Alloy

A Review on Present Status of Friction Stir Welding of Nitinol, a Functionally Advanced, Versatile and Widely Used Shape Memory Alloy

Microstructure and Mechanical Property Correlation Between Rotary Friction Welded Nitinol–Nitinol Joints

Investigations on the actuation behaviour of friction stir–welded nickel titanium shape memory alloy using continuous fibre laser

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