Microstructural and morphological evaluation of MCrAlY/YSZ composite produced by mechanical alloying method

Tahari, Mostafa; Shamanian, M.; Salehi, Mehdi

doi:10.1016/j.jallcom.2012.01.161

Cited by 25 publications

(15 citation statements)

References 38 publications

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“…Comparing the XRD patterns of the as-received and milled powders indicate that β-phase precipitates disappear during milling process, probably due to dissolution into the matrix (γ phase). This phenomenon has been reported in the case of several MCrAlY-based alloys [4,32,[51][52][53]. The absence of the β phase peaks on the milled powder spectrum could be the result of experiencing severe plastic deformation during milling.…”

Section: Distribution Of Nano-ceomentioning

confidence: 52%

“…Coatings with nanosized grains could lead to fast diffusion paths for Al from coating through the grain boundaries which favors to the formation of pure and compact protective oxide layer of α-Al 2 O 3 [19]. In this regard, mechanical milling process is known to be one of the effective techniques and rapid processing route for preparing nanostructured and nanocomposite powders for the thermal spray deposition processes [26,[31][32][33][34][35]. At present, there are some researches on the effect of several reinforcements in the MCrAlY-based nanocomposites, investigating the mechanical properties and high temperature corrosion behavior of these materials [25,36,37].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

Zakeri

Ghadami

Rouhaghdam

et al. 2020

Mater. Res. Express

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This paper investigates NiCoCrAlY-CeO 2 nanocomposite powders prepared by mechanical milling process. At first, micron-sized ceria powder was pre-milled to obtain nano-sized powders and then 1 wt% CeO 2 was mixed with the conventional NiCoCrAlY powder and milled under three sets of parameters. The conventional and milled powders were deposited on low carbon steel substrates by HVOF thermal spray technique. X-ray diffraction (XRD), scanning electron microscopy (SEM), fieldemission scanning electron microscopy (FESEM) and image analyzing method were used to characterize the prepared powders and coatings. Microstructural characterization showed that the milled powders underwent morphological and phase transitions. Through the microstructural and compositional analyses, it was found that a homogeneous distribution of CeO 2 nano-dispersoids in the NiCoCrAlY matrix was obtained. The resulting coatings showed that by using optimized milling parameters, required particle size and suitable morphology for thermal spray can be achieved.

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Section: Distribution Of Nano-ceomentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

Zakeri

Ghadami

Rouhaghdam

et al. 2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…A previous study by authors showed that the decreasing rate of grain size was further reduced with increasing YSZ [28].…”

Section: Mechanical Millingmentioning

confidence: 85%

“…It can be observed in Fig 3 that severe plastic deformation during mechanical milling resulted in the disappearance of β peaks [28]. Richer et al showed that the β was dissoluted into γ-phase [37].…”

Section: Phase Stabilitymentioning

confidence: 95%

The effect of heat treatment and thermal spray processes on the grain growth of nanostructured composite CoNiCrAlY/YSZ powders

Tahari

Shamanian

Salehi

2015

Journal of Alloys and Compounds

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“…Al 2 O 3 , Cr 7 C 3 and TaC). Some researchers have developed oxide dispersion strengthened MCrAlX coatings, suggesting the hard phases strengthen the alloy matrix by impeding the motion of dislocations [33][34][35][36]. Additionally, after oxidation test at 200°C and 400°C, the microhardness of the CoCrAlYTa-10%Al 2 O 3 coating and H13 steel was basically the same as that at room temperature.…”

Section: Oxidation Behavior Of the Cocralyta-10%al 2 O 3 Coatingmentioning

confidence: 96%

Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al₂O₃ coating deposited by high-velocity oxygen fuel thermal spraying

Hong

Yang

et al. 2020

Mater. Res. Express

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The CoCrAlYTa-10%Al 2 O 3 coating was fabricated on H13 steel substrate using high-velocity oxygen fuel (HVOF) thermal spraying. A detail characterization on the microstructures, element distribution and phase composition of the HVOF sprayed CoCrAlYTa-10%Al 2 O 3 coating was conducted using scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), x-ray diffraction (XRD) and transmission electron microscopy (TEM). The microstructural evolution and microhardness of the coating at different temperatures were investigated. The results showed that the coating had a dense and uniform microstructure with a low porosity of 0.44%. The primary phases for the CoCrAlYTa-10%Al 2 O 3 coating were identified as Co-based solid solution, Cr-based solid solution, Al 2 O 3 phase and TaC particles. Compounds such as Cr 7 C 3 , Al 13 Co 4 and aluminum-yttrium oxides Al 5 Y 3 O 12 were also confirmed by TEM observation results. Owing to the rapidly cooling rates of the molten droplets, nano-crystalline phase was existed in the coating. The average microhardness of the coating was 640 HV 0.1 . Its high microhardness derived from the presence of certain volume fraction of hard Al 2 O 3 , Cr 7 C 3 and TaC grains within the coating. After 1h of oxidation, oxides like CrO 2 and Ta 2 O 5 were formed when the coating exposed at the temperature up to 800°C. At the temperature above 600°C, the hardness of the coating remained at a high level (600 HV 0.1 ). It possessed better high temperature softening resistance than H13 steel, indicated that the coating exhibited good mechanical properties at high temperature.

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Microstructural and morphological evaluation of MCrAlY/YSZ composite produced by mechanical alloying method

Cited by 25 publications

References 38 publications

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

The effect of heat treatment and thermal spray processes on the grain growth of nanostructured composite CoNiCrAlY/YSZ powders

Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al₂O₃ coating deposited by high-velocity oxygen fuel thermal spraying

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Microstructural and morphological evaluation of MCrAlY/YSZ composite produced by mechanical alloying method

Cited by 25 publications

References 38 publications

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

Study on production of modified MCrAlY powder with nano oxide dispersoids as HVOF thermal spray feedstock using mechanical milling

The effect of heat treatment and thermal spray processes on the grain growth of nanostructured composite CoNiCrAlY/YSZ powders

Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying

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Product

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Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al₂O₃ coating deposited by high-velocity oxygen fuel thermal spraying