Nanostructured Ni–Ti alloys obtained by mechanical synthesis and heat treatment

Karolus, M.; Panek, J.

doi:10.1016/j.jallcom.2015.10.286

Cited by 35 publications

(18 citation statements)

References 22 publications

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“…Through this technique, a large variety of materials are produced such as intermetallics, extended solid solutions, quasicrystals, and amorphous phases [17]. Moreover, in this process, the reduction of particle size is observed, resulting in ultra-fine grained or nanocrystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Sakher

Loudjani

Benchiheub

et al. 2018

Journal of Nanomaterials

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Nanostructured Ni 50 Ti 50 powders were prepared by mechanical alloying from elemental Ni and Ti micrometer-sized powders, using a planetary ball mill type Fritsch Pulverisette 7. In this study, the effect of milling time on the evolution of structural and microstructural parameters is investigated. Through Rietveld refinements of X-ray diffraction patterns, phase composition and structural/microstructural parameters such as lattice parameters, average crystallite size ⟨ ⟩, microstrain ⟨ 2 ⟩ 1/2 , and stacking faults probability (SFP) in the frame of MAUD software have been obtained. For prolonged milling time, a mixture of amorphous phase, NiTi-martensite (B19 ), and NiTi-austenite (B2) phases, in addition to FCC-Ni(Ti) and HCP-Ti(Ni) solid solutions, is formed. The crystallite size decreases to the nanometer scale while the internal strain increases. It is observed that, for longer milling time, plastic deformations introduce a large amount of stacking faults in HCP-Ti(Ni) rather than in FCC-Ni(Ti), which are mainly responsible for the observed large amount of the amorphous phase.

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Section: Introductionmentioning

confidence: 99%

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Sakher

Loudjani

Benchiheub

et al. 2018

Journal of Nanomaterials

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“…1a). More detailed description of the mechanical alloying of Ni 50 Ti 50 system is presented elsewhere [9].…”

Section: Resultsmentioning

confidence: 99%

Structure Studies on Mechanically Alloyed Ni₅₀Ti_50-xMo_x (x=10, 25, 40 at.%) Systems during Milling and after Annealing

2016

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The subject of this study is the phase composition evolution of Ni50Ti50−xMox (x = 10, 25, 40 at.%) systems prepared by mechanical alloying in as-milled state and after subsequent heat treatment. During milling a mechanically induced solid state reaction between nickel, titanium and molybdenum was observed leading to the formation of nanocrystalline disordered solid solutions. As a result of heat treatment a creation of NiMo intermetallic phase was observed as well as structure relaxation of previously formed solid solutions.

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“…According to the number of reflections, the Ni 3 B phase is more crystalline and stable with respect to the TiB 2 and TiB phases. According with the titanium content was expected more nickel boride phases (Ni 3 B and Ni 2 B) as is indicated in Table 2; however the reactions betweeen titanium and boron were more stable to transform in the two crystalline phases (TiB 2 and TiB) with a Gibbs free energy more negative with respect the reactions between Ni-B and Ni-Ti [14][15][16].…”

Section: Heat Treatment After Millingmentioning

confidence: 99%

Synthesis of TiB2-Ni3B Nanocomposite Powders by Mechanical Alloying

Hernández¹,

Escobedo²,

Hernández³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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Combination of good oxidation resistance, thermal stability, hardness and high strength are great interest properties in engineering and, that are possible to obtain with the Ni-Ti-B ternary system. Mechanical alloying (MA) is an alternative method and cheapest for the synthesis of this kind of metal-ceramic materials with respect to the traditional melt and quench process. The transformation sequence of all the mixtures reported the formation of (ɣ Ni) phase with a nodular morphology and identified the additional presence of the TiB 2 phase (needle morphology), which was more evident with the increase of titanium content (M2 and M3 mixtures) after 24 h of milling. Thermal activation of the milled powders showed the nucleation and growth of the Ni 3 B (O boride) and TiB 2 (Hex) as the main phases after heat treatment, where the TiB 2 phase (thin flakes morphology) was nucleated onto Ni 3 B matrix. Ternary alloy by MA took place under a metastable equilibrium, offering the possibility to form glassy alloys for compositions, which are not accessible by melting or quenching techniques.

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Nanostructured Ni–Ti alloys obtained by mechanical synthesis and heat treatment

Cited by 35 publications

References 22 publications

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Structure Studies on Mechanically Alloyed Ni₅₀Ti_50-xMo_x (x=10, 25, 40 at.%) Systems during Milling and after Annealing

Synthesis of TiB2-Ni3B Nanocomposite Powders by Mechanical Alloying

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Nanostructured Ni–Ti alloys obtained by mechanical synthesis and heat treatment

Cited by 35 publications

References 22 publications

Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis

Influence of Milling Time on Structural and Microstructural Parameters of Ni50Ti50 Prepared by Mechanical Alloying Using Rietveld Analysis

Structure Studies on Mechanically Alloyed Ni50Ti50-xMox (x=10, 25, 40 at.%) Systems during Milling and after Annealing

Synthesis of TiB2-Ni3B Nanocomposite Powders by Mechanical Alloying

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Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Influence of Milling Time on Structural and Microstructural Parameters of Ni₅₀Ti₅₀ Prepared by Mechanical Alloying Using Rietveld Analysis

Structure Studies on Mechanically Alloyed Ni₅₀Ti_50-xMo_x (x=10, 25, 40 at.%) Systems during Milling and after Annealing