Grain growth of nanocrystalline Fe–Al alloys produced by cryomilling in liquid argon and nitrogen

Huang, B.; Pérez, Rafael Granell; Lavernia, Enrique J.

doi:10.1016/s0921-5093(98)00765-5

Cited by 66 publications

(31 citation statements)

References 10 publications

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“…However, cryomilling of Fe-10 wt% Al powders in liquid argon as well in liquid nitrogen resulted in nanocrystalline structures which were thermally stable at least up to 1223 K. The enhanced thermal stability of the cryomilled Fe-10 wt% Al powders in liquid argon was attributed to the formation of gAl 2 O 3 due to moisture condensation. The thermal stability of this alloy powder milled in liquid nitrogen was attributed to the formation of oxynitrides, or g-Al 2 O 3 and AlN particles during cryomilling in liquid nitrogen and to the solute segregation resulting in solute drag at the grain boundaries [219]. The Al 2 O 3 and AlN particles act as fine dispersoids that stabilize the grain size via Zener pinning.…”

Section: Solid Route 331 Mechanical Alloying/millingmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

844

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Solid Route 331 Mechanical Alloying/millingmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

844

345

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“…3,[12][13][14] In these systems, the conditions of low temperature and a nitrogen atmosphere have been used in order to inhibit the oxidation and nitridation of these alloys, the synthesis of a metastable phase, and to acquire thermal stability on a nanoscale size. Thus, the control of chemical and mechanical parameters in the cryomilling process is an important factor to the success of the sintering process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cryomilling on Particle Size and Microstrain in a WC-Co Alloy

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Lee

Kang

2005

MATERIALS TRANSACTIONS

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The effects of temperature and milling time on the crystalline size and microstrain in WC and WC-Co powders were investigated in a cryomilling process. Within the limit of the analytical methods and TEM, the crystalline size of WC was estimated to be in the range of 50$70 nm after 10 h of cryomilling. The presence of Co in the WC-Co system significantly reduced the level of strain in the WC particles in this low-temperature processing. A thermal cycle employed in cryomilling process was also found to be useful in various aspects. Various fitting methods were compared and the results are discussed in relation to processing parameters.

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“…A variety of techniques have been used to prepare chromium carbide based coatings and the high velocity oxygen fuel (HVOF) process is widely used, as it produces smooth, low porosity, dense and adherent coatings, without altering significantly the integrity of the carbide particles 11,15,16 . Brandt 17 investigated the effects of different HVOF spraying parameters on the fatigue resistance of samples coated with Cr 3 C 2 -NiCr powders; Lavernia [18][19][20] conducted several investigations in this area, ranging from synthesis of nanostructured Cr 3 C 2 -25(Ni-20Cr) coatings to the development of nanocrystalline structures using cryogenic environment; He and Schoenung 11 performed a comprehensive study of nanostructured coatings produced by HVOF, with emphasis on nanostructured WC-Co and Cr 3 C 2 -25(Ni-20Cr) powders; Guilemani et al 21 conducted microstructural characterization of Cr 3 C 2 -NiCr coatings produced by HVOF, besides investigating the effects of thermal cycling and extended isothermal treatment on the adhesion properties of as-coated and thermally treated samples; Roy et al 22 also compared the microstructure and mechanical properties (hardness, elastic modulus and fracture toughness) of coatings produced with as-received and nanostructured Cr 3 C 2 -25(Ni-20Cr) powders. Overall, these and many other investigations have shown that specific properties of nanostructured materials are better than those of their conventional counterparts [23][24][25][26][27][28] .…”

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High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

et al. 2017

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This study reports the high temperature erosion-oxidation (E-O) behavior of conventional and nanostructured Cr 3 C 2 -25(Ni-20Cr) coatings prepared by high velocity oxygen fuel (HVOF) spraying. As-received and nanostructured Cr 3 C 2 -25(Ni-20Cr) powders with mean crystallite sizes of 145 nm and 50 nm respectively, were used to prepare 120 -200 μm thick coatings on AISI 310 samples. The E-O behavior of the coatings prepared with the as-received (AR) and nanostructured (NS) powders was determined as weight change in a custom designed rig at room temperature, 450, 700 and 800 ºC. The Vickers microhardness, Young's Modulus and fracture toughness of the AR and NS coatings were determined, and the NS coatings exhibited higher values compared with the AR coatings. The E-O resistance of the NS coating was higher than that of AR coating at all temperatures, and particularly at 800 ºC. The increase in E-O resistance of the NS coatings is due to its superior mechanical properties as well as to the presence of some heterogeneities in the AR coatings. The E-O mechanisms of both types of the coatings are discussed, with special attention to that at high temperatures. The results suggest that at 800 ºC the E-O process is controlled by erosion of the oxide.

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Grain growth of nanocrystalline Fe–Al alloys produced by cryomilling in liquid argon and nitrogen

Cited by 66 publications

References 10 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Effect of Cryomilling on Particle Size and Microstrain in a WC-Co Alloy

High Temperature Erosion-oxidation Resistance of Thermally Sprayed Nanostructured Cr3C2-25(Ni-20Cr) Coatings

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