Deposition and characterization of cold sprayed nanocrystalline NiTi

Tria, S.; Elkedim, O.; Hamzaoui, Rabah; Guo, Xueping; Bernard, Frédéric; Millot, Nadine; Rapaud, Olivier

doi:10.1016/j.powtec.2011.02.026

Cited by 35 publications

(22 citation statements)

References 50 publications

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“…It can be observed that at first stages of milling, because of severe plastic deformation and disordering, the Ni lattice parameter is decreased (which is compatible with Ref. [30]) and then, owing to dissolution of Cu and especially Ti in the Ni lattice, it is increased. Fig.…”

Section: Structural Characterizationsupporting

confidence: 84%

Quantitative phase evolution during mechano-synthesis of Ti–Ni–Cu shape memory alloys

Amini¹,

Alijani²,

Ghaffari³

et al. 2012

Journal of Alloys and Compounds

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a b s t r a c tTi-41Ni-9Cu shape memory alloy was synthesized by mechanical alloying of pure elemental Ti, Ni, and Cu powders using high-energy ball milling. The qualitative and quantitative phase analyses of the asmilled powders were done by X-ray diffraction (XRD) using Rietveld refinement and the alloys microstructure was studied by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). Concerning the results, by milling evolution, the dissolution of the primary materials occurred at different rates and a considerable amount of the amorphous phase as well as B19 0 -martensite and B2-austenite was created. The formation of Ni solid solution was also evidenced prior to its dissolution. It was found that at sufficient milling time, the mechano-crystallization of the amorphous phase occurred and at the end of milling, the B19 0 -martensite is the dominant phase of the structure.

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Section: Structural Characterizationsupporting

confidence: 84%

Quantitative phase evolution during mechano-synthesis of Ti–Ni–Cu shape memory alloys

Amini¹,

Alijani²,

Ghaffari³

et al. 2012

Journal of Alloys and Compounds

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“…Ni-based superalloys [195,196] High-temperature applications NiTi [197,198] Shape memory Nanocrystals Steel 316L, 304L [134,[199][200][201] Heat treatment Phase transformation Stellite [202][203][204] Wear resistance Ta [197,198] Oxygen evolution reaction Corrosion protection Ti [205,206] Review Zn, Zn alloys [176,207] Printing rolls Corrosion protection CS is a particularly attractive method for the deposition of metastable materials such as metallic glasses, without dimensional restriction. In this respect, CS may be considered as the only practical method through which bulk metallic glasses of any size may be produced.…”

Section: Metallic Materialsmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

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“…NiTi SMA can be synthesized through different methods including liquid state [8][9][10][11] and solid state [12][13][14][15][16][17][18][19] routes. Among solid state techniques, mechanical alloying (MA) is a less expensive and simple procedure to synthesize the supersaturated solid solutions, nanocrystals, and amorphous structures.…”

Section: Introductionmentioning

confidence: 99%

Formation of B19′, B2, and amorphous phases during mechano-synthesis of nanocrystalline NiTi intermetallics

et al. 2014

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Ni-50Ti shape memory alloy was synthesized by mechanical alloying of the elemental powders mixture under an argon gas atmosphere. The structural and microstructural properties of the alloyed powders were evaluated by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. Moreover, the Vickers microhardness of the powders was estimated at different milling times. According to the results, by milling progression, the amount of the amorphous phase increased considerably and after sufficient milling time (48 h), the mechanocrystallization of the amorphous phase into the more stable crystalline phases (i.e. B2 and B19′) occurred. It was found that the particles size and microhardness were significantly affected by the formation of the amorphous, B2, and B19′ phases. It was also deduced that, by appropriate heating and cooling cycles, the B2 and thermally-induced B19′ phases can be created. Furthermore, it was inferred that the formation of undesirable intermetallic phases (particularly NiTi 2 ) during the heating cycle was considerably reduced by milling time evolution.

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Deposition and characterization of cold sprayed nanocrystalline NiTi

Cited by 35 publications

References 50 publications

Quantitative phase evolution during mechano-synthesis of Ti–Ni–Cu shape memory alloys

Quantitative phase evolution during mechano-synthesis of Ti–Ni–Cu shape memory alloys

Cold spraying – A materials perspective

Formation of B19′, B2, and amorphous phases during mechano-synthesis of nanocrystalline NiTi intermetallics

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