Nanocrystalline NiAl intermetallic alloy with high hardness produced by mechanical alloying and hot-pressing consolidation

Krasnowski, M.; Gierlotka, S.; Ciołek, Sylwia; Kulik, T.

doi:10.1016/j.apt.2019.04.006

Cited by 32 publications

(13 citation statements)

References 49 publications

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“…This indicates that all Ni reacted with Al, creating a NiAl intermetallic phase, at least partially ordered. The observed reaction between Ni and Al and phase development during the formation of the NiAl phase was analogous to those described earlier for mechanical alloying of Ni-50at.%Al powder mixture performed in the same kind of mill [ 43 ]. The diffraction peaks of Al 2 O 3 were present in the discussed XRD patterns all while.…”

Section: Resultssupporting

confidence: 82%

“…Another research on nanocrystalline NiAl carried out by the same research team showed that the presence of a nanocrystalline phase significantly exceeds the hardness compared to microcrystalline NiAl alloys. The hardness obtained for nanocrystalline NiAl amounted to 9.53 GPa [ 43 ]. According to literature data, the addition of Al 2 O 3 to NiAl favorably affects the hardness of the material.…”

Section: Resultsmentioning

confidence: 99%

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Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

et al. 2021

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The paper describes an investigation of Al2O3 samples and NiAl–Al2O3 composites consolidated by pulse plasma sintering (PPS). In the experiment, several methods were used to determine the properties and microstructure of the raw Al2O3 powder, NiAl–Al2O3 powder after mechanical alloying, and samples obtained via the PPS. The microstructural investigation of the alumina and composite properties involves scanning electron microscopy (SEM) analysis and X-ray diffraction (XRD). The relative densities were investigated with helium pycnometer and Archimedes method measurements. Microhardness analysis with fracture toughness (KIC) measures was applied to estimate the mechanical properties of the investigated materials. Using the PPS technique allows the production of bulk Al2O3 samples and intermetallic ceramic composites from the NiAl–Al2O3 system. To produce by PPS method the NiAl–Al2O3 bulk materials initially, the composite powder NiAl–Al2O3 was obtained by mechanical alloying. As initial powders, Ni, Al, and Al2O3 were used. After the PPS process, the final composite materials consist of two phases: Al2O3 located within the NiAl matrix. The intermetallic ceramic composites have relative densities: for composites with 10 wt.% Al2O3 97.9% and samples containing 20 wt.% Al2O3 close to 100%. The hardness of both composites is equal to 5.8 GPa. Moreover, after PPS consolidation, NiAl–Al2O3 composites were characterized by high plasticity. The presented results are promising for the subsequent study of consolidation composite NiAl–Al2O3 powder with various initial contributions of ceramics (Al2O3) and a mixture of intermetallic–ceramic composite powders with the addition of ceramics to fabricate composites with complex microstructures and properties. In composites with complex microstructures that belong to the new class of composites, in particular, the synergistic effect of various mechanisms of improving the fracture toughness will be operated.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

et al. 2021

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“…Nickel aluminides, especially NiAl, have been attracted many interests in industrial applications due to their wonderful properties such as wide composition range, high melting point, high oxidation, and hot corrosion resistance at high temperatures and low density [1][2][3][4][5]. Also, NiAl has good tribological properties [6,7]; however, sole NiAl materials contain low toughness and poor ductility at ambient temperature and poor strength and creep resistance at high temperatures which restricts its hightemperature applications [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Also, NiAl has good tribological properties [6,7]; however, sole NiAl materials contain low toughness and poor ductility at ambient temperature and poor strength and creep resistance at high temperatures which restricts its hightemperature applications [8,9]. Based on previous studies, the reduction of crystallite and particle sizes of NiAl [4,[10][11][12] and fabrication of In-situ composite [13,14] can improve the mechanical properties of NiAl. Many efforts have been devoted to developing a nano-crystalline reinforced nickel aluminide which one of them is reinforcing NiAl by a reinforcement(s) (as second phases) like ceramic materials.…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Mehrizi¹

2020

Preprint

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The aim of this study was the synthesis of a homogenous distributed NiAl/TiC composite by combustion synthesis of elemental powders. The effect of the mechanical activation process was evaluated. The phase characterization and evaluation of the microstructure during milling and combustion synthesis were carried on by XRD and SEM-EDS and TEM-EDS, respectively. The XRD result of as-mixed powder compact after combustion synthesis showed that in addition to TiC0.75 and NiAl, some undesired phases like Ni3Al and Ni2Al3 formed. While after combustion synthesis of 3h mechanically activated powder compact, only AlNi and TiC formed. The microstructural evaluations by SEM-EDS and TEM-EDS analysis confirmed the synthesis of truly homogenized NiAl/TiC composite. The mechanism of NiAl/TiC formation consists of dissolution of nickel, titanium, and graphite in molten aluminum and precipitation of TiC primarily and then the formation of NiAl. The value of microhardness of synthesized NiAl/TiC was 1070±12 HV. The main reason for this result is a uniform distribution of spherical TiC reinforcement in the NiAl matrix. Therefore, the mechanical activation process facilitated the reactions and improved the mechanical properties of the final composite.

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“…Metal-matrix composite (MMC) coatings might allow improving the surface properties of materials, but eventual success of such operations depends on a proper choice of matrix and strengthening phase, as well as a careful design of their microstructure. The NiAl matrix offers a number of advantages, including high hardness and oxidations resistance, allowing to protect parts used in the aviation industry, especially in gas turbine engines [1,2,3]. However, at elevated temperatures it softens and makes itself more and more susceptible to abrasion.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Coatings on Nickel and Steel Platelets Obtained by Co-Milling with NiAl and CrB2 Powders

et al. 2019

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Metal matrix composite coatings are developed to protect parts made from materials susceptible to wear, like nickel alloys or stainless steel. The industry-established deposition method is presently an atmospheric plasma spraying method since it allows the production of both well-adhering and thick coatings. Alternatively, similar coatings could be produced by co-milling of ceramic and alloyed powders together with metallic plates serving as substrates. It results in mechanical embedding of the powder particles into exposed metallic surfaces required coatings. The present experiment was aimed at the analysis of microstructure of such coatings obtained using NiAl and CrB2 powders. They were loaded together with nickel and stainless steel platelets into ball mill vials and rotated at 350 rpm for up to 32 h. This helped to produce coatings of a thickness up to ~40 µm. The optical, scanning, and transmission electron microscopy observations of the coatings led to conclusion that the higher the rotation speed of vials, the wider the intermixing zone between the coating and the substrate. Simultaneously, it was established that the total thickness of the coating deposited at specified conditions is limited by the brittleness of its nanocrystalline matrix. An increase in the hardness of the substrate results in a decrease of the intermixing zone. The above results indicate that even as the method based on mechanical embedding could so far produce thinner coatings than the plasma spraying, in the former case they are characterized by a more uniform nanocrystalline matrix with homogenously distributed fine ceramic particles.

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Nanocrystalline NiAl intermetallic alloy with high hardness produced by mechanical alloying and hot-pressing consolidation

Cited by 32 publications

References 49 publications

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

Characterization of Al2O3 Samples and NiAl–Al2O3 Composite Consolidated by Pulse Plasma Sintering

Combustion synthesis of NiAl/TiC composite from mechanically activated elemental powders

Microstructure of Coatings on Nickel and Steel Platelets Obtained by Co-Milling with NiAl and CrB2 Powders

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