Microstructural, mechanical and strain hardening behaviour of NiTi alloy subjected to constrained groove pressing and ageing treatment

Bhardwaj, A.; Ojha, Mihir; Garudapalli, Ashutosh; Gupta, Amit Kumar

doi:10.1016/j.jmatprotec.2021.117132

Cited by 19 publications

(8 citation statements)

References 40 publications

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“…Like in previous studies 61,100,103–105 of magnesium alloys, many other alloys 102,106–109 also demonstrate the characteristics of thermal stability and its effect on mechanical properties as shown in Table 3. 6061 aluminum alloy, 106 low carbon steel, 107 and NiTi alloy 102 are initially processed through CGP followed by annealing at various temperature ranges. Thermal stability with recrystallization is exhibited at the specific temperature for each material.…”

Section: Advanced Developing Processes Of Cgpsupporting

confidence: 68%

“…Besides copper 90 and low carbon steel, 101 CGP-processed equiatomic NiTi alloy sample was subjected to short-term aging treatments. 102 The microstructure of the NiTi alloy confirms the grain refinement, increased grain boundary fraction, and high dislocation density. Furthermore, the heat treatment after CGP at different temperatures leads to the nucleation and growth of Ni 4 Ti 3 and Ni 3 Ti precipitates.…”

Section: Advanced Developing Processes Of Cgpmentioning

confidence: 70%

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Developing methods of constrained groove pressing technique: A review

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Among various severe plastic deformation (SPD) techniques, constrained groove pressing (CGP) has arisen as a famous technique for fabricating ultrafine-grained sheet metals and alloys in recent times. The severe strain is applied to improve the mechanical performance and properties. However, inhomogeneous grain refinement, lower formability, surface unevenness, and microcracks are the common limitations of conventional CGP-processed samples. Therefore, this review inspects the latest progress through modifications of the CGP process and compares the process efficacy with the conventional process. Advanced CGP processing techniques, such as modification of die design, annealing of the processed sample, cross CGP, ring CGP, hybrid SPD, covered sheet casing CGP, and rubber pad CGP, are emerging techniques to up-scale the procedure and improve the grain refinement and thereby produce superior mechanical properties. In this review paper, the historic research of conventional CGP and its effect on grain refinement and mechanical properties is initially briefed and then recent progress through different advanced techniques is highlighted, especially in alloys. Albeit significant progress has been observed in CGP, the future scope and successful usage of CGP-processed samples in actual practice are discussed in the last stage.

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Section: Advanced Developing Processes Of Cgpsupporting

confidence: 68%

Section: Advanced Developing Processes Of Cgpmentioning

confidence: 70%

Developing methods of constrained groove pressing technique: A review

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…A. Bhardwaj et al (2021) performed constrained groove pressing in order to modify the strength and ductility of NiTi sheet and yield strength, ultimate tensile strength, microhardness and uniform elongation were found to be improved in all the constrained groove pressing'ed and constrained groove pressing aged specimens [14]. X.…”

Section: Figurementioning

confidence: 99%

Mechanical Properties of NiTi Based Shape Memory Alloy used in Manufacturing of Mars Rover Wheels: Short Review

Parmar¹,

Mishra²

2022

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Shape memory alloys (SMA) are innovatively designed for engineering applications including, but not limited to, medical devices, actuators, micromechanical systems, deployable structures, and elastocaloric devices. Prior to the manufacture of any component for the above mentioned applications, an extensive simulation study is recommended as the basic properties are required to be filled in the software. The unavailability of to-the-point literature makes this task difficult for researches. In this paper, an overview of binary NiTi based shape memory alloy is given, where its characteristic physical properties i.e. shape memory effect and super elastic effect, and mechanical properties like fatigue failure, stress-strain characteristics and yield and ultimate strength is stated for several different specimens prepared using thermomechanical methods.

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“…18 In this research, the fracture strength and elongation of the final CGPed sample revealed 10% and 75% improvements, respectively. 18 Strain hardening behavior of NiTi alloy sheets produced by CGP technique was studied by Bhardwaj et al 19 They claimed that post-CGP aging enhanced the YS by 73%-112%, UTS by 12%-25%, and the microhardness by 22%-67%, respectively, due to the dislocation generation.…”

Section: Introductionmentioning

confidence: 99%

Inclusive anisotropy and texture analyses of AZ91 Mg sheets subjected to various passes of elevated-temperature constrained groove pressing

Fereshteh-Saniee

Ghorbanhosseini

Sonboli

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Constrained groove pressing (CGP) is a kind of sheet severe plastic deformation method suitable for enhancing the strengths of light alloys for various applications such as aerospace and automotive industries. In this research, the annealed AZ91 Mg alloy sheets were subjected to three CGP cycles at 300°C. Subsequently, optical microscopy, scanning electron microscopy, x-ray diffraction, and tensile tests for various directions were performed. Initially, there was a basal texture with a maximum intensity of 3.4 multiple random distribution and several β-Mg17Al12 particles as the second phase in the annealed sheet. As an important achievement of employing the CGP operation, the 1-passed sample represented a superior elongation of 35.7%, maximum yield strength of 141.0 MPa, and maximum ultimate tensile strength of 231.0 MPa in the rolling direction. These were mainly due to, the grain refinement, enhancing the fiber texture in the transverse direction, and controlling the basal texture. However, the experimental results revealed that the basal texture during the second and third passes of the operation could not be controlled. The main preferred orientation was changed from [Formula: see text] fiber for the annealed sheet to [Formula: see text] fiber for the CGPed sheets. It is also interesting to note that based on an anisotropy analysis, the 1-passed sample was the most isotropic worksheet, making this specimen a suitable blank for secondary metal forming processes, in comparison with the other CGPed samples. Fractography also indicated that the fracture mechanism varied among ductile, brittle, and mixed modes for workpieces subjected to different passes of the process.

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Microstructural, mechanical and strain hardening behaviour of NiTi alloy subjected to constrained groove pressing and ageing treatment

Cited by 19 publications

References 40 publications

Developing methods of constrained groove pressing technique: A review

Developing methods of constrained groove pressing technique: A review

Mechanical Properties of NiTi Based Shape Memory Alloy used in Manufacturing of Mars Rover Wheels: Short Review

Inclusive anisotropy and texture analyses of AZ91 Mg sheets subjected to various passes of elevated-temperature constrained groove pressing

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