Solid solution evolution during mechanical alloying in Cu-Nb-Al compounds

Zaara, Kaouther; Chemingui, Mahmoud; Optasanu, Virgil; Khitouni, Mohamed

doi:10.1007/s12613-019-1820-y

Cited by 11 publications

(7 citation statements)

References 50 publications

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“…On the other hand, the crystallite size of the FCC (γ) phase reaches a value of about 10.8 nm, with a microstrain rate close to 0.5%. In fact, the multiplication of grain boundaries and the microstrain can increase because of the mechanical distortion and the internal micro-deformation [36]. The steady state of the crystallite size and the lattice strain reached after 100 h of milling could be attributed to the temperature rise of the powder surface during higher milling times [37].…”

Section: Microstructural Analysismentioning

confidence: 99%

“…The increase in the lattice parameter can be explained by the grain expansion due to the increase in the density of dislocations with their characteristic strain fields [39,40]. distortion and the internal micro-deformation [36]. The steady state of the crystallite size and the lattice strain reached after 100 h of milling could be attributed to the temperature rise of the powder surface during higher milling times [37].…”

Section: Microstructural Analysismentioning

confidence: 99%

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Microstructural and Magnetic Behavior of Nanocrystalline Fe-12Ni-16B-2Si Alloy Synthesis and Characterization

Zaara

Khitouni

Escoda

et al. 2021

Metals

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The nanocrystalline Fe70Ni12B16Si2 (at.%) alloy was prepared by mechanical alloying (MA) of elemental powders in a high-energy planetary ball mill. Phase evolution, microstructure, thermal behavior and magnetic properties were investigated. It was found that a body-centered cubic structured solid solution started to form after 25 h milling and a faced-centered cubic structure solid solution started to form after 50 h of milling; its amount increased gradually with increasing milling time. The BCC and the FCC phases coexisted after 150 h of milling, with a refined microstructure of 13 nm and a 10 nm crystallite size. The as-milled powder was annealed at 450 °C and 650 °C and then investigated by vibrating sample magnetometry (VSM). It was shown that the semi-hard magnetic properties are affected by the phase transformation on annealing. The saturation magnetization decreases after annealing at 450 °C, whereas annealing at 650 °C improves the magnetic properties of 150 h milled powders through the reduction of coercivity from 109 Oe to 70 Oe and the increase in saturation magnetization.

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Section: Microstructural Analysismentioning

confidence: 99%

Section: Microstructural Analysismentioning

confidence: 99%

Microstructural and Magnetic Behavior of Nanocrystalline Fe-12Ni-16B-2Si Alloy Synthesis and Characterization

Zaara

Khitouni

Escoda

et al. 2021

Metals

Self Cite

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show abstract

“…During the mechanical alloying process, the sample particles are continuously deformed, crushed, and cold sintered under mechanical impact conditions, which led to grain refinement and microstrain occurring in the crystal grains. The dislocation density ( d ) can be represented by the following equation [34]:…”

Section: Synthesis and Characterization Of Nano Ta 4 Hfc 5 Powdermentioning

confidence: 99%

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Wang

Yang

et al. 2020

J Adv Ceram

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The in situ nano Ta4HfC5 reinforced SiBCN-Ta4HfC5 composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the resulting SiBCN-Ta4HfC5 were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC underwent crushing, cold sintering, and short-range interdiffusion to finally obtain the high pure nano Ta4HfC5. A hybrid structure of amorphous SiBCN and nano Ta4HfC5 was obtained by adopting a second-step ball-milling. After reactive hot-pressing sintering, amorphous SiBCN has crystallized to 3C-SiC, 6H-SiC, and turbostratic BN(C) phases and Ta4HfC5 retained the form of the nanostructure. With the in situ generations of 2.5 wt% Ta4HfC5, Ta4HfC5 is preferentially distributed within the turbostratic BN(C); however, as Ta4HfC5 content further raised to 10 wt%, it mainly distributed in the grain-boundary of BN(C) and SiC. The introduction of Ta4HfC5 nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics, reaching to 344.1 MPa and 4.52 MPa·m1/2, respectively. This work has solved the problems of uneven distribution of ultra-high temperature phases in the ceramic matrix, which is beneficial to the real applications of SiBCN ceramics.

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“…During the mechanical alloying process, the sample particles are continuously deformed, crushed and cold sintered under mechanical impact conditions, which led to grain refinement and microstrain occurring in the crystal grains. The dislocation density can be represented by the following equation [37] :…”

Section: Synthesis Of Sibcn-ta 4 Hfc 5 Powder and Bulk Ceramicsmentioning

confidence: 99%

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Wang

Yang

et al. 2020

Preprint

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In this paper, the in situ nano Ta 4 HfC 5 reinforced SiBCN-Ta 4 HfC 5 composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the SiBCN-Ha 4 HfC 5 were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC undergone crushing, cold sintering and short-range interdiffusion to finally obtain the high pure nano Ta 4 HfC 5 . A hybrid structure of amorphous SiBCN and nano Ta 4 HfC 5 was obtained by adopting a second-step ball-milling. After reactive hot-pressing sintering, amorphous SiBCN has crystallized to nano SiC and turbostratic BN(C) phases while Ta 4 HfC 5 retained the form of nano structure. With the in situ generation of 2.5 wt% Ta 4 HfC 5 , Ta 4 HfC 5 is preferentially distributed within the turbostratic BN(C); however, as Ta 4 HfC 5 content further raised to 10 wt%, it mainly distributed in the grain-boundary of BN(C) and SiC. The introduction of Ta 4 HfC 5 nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics, reaching to 344.1 MPa and 4.52 MPa•m 1/2 , respectively.

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Solid solution evolution during mechanical alloying in Cu-Nb-Al compounds

Cited by 11 publications

References 50 publications

Microstructural and Magnetic Behavior of Nanocrystalline Fe-12Ni-16B-2Si Alloy Synthesis and Characterization

Microstructural and Magnetic Behavior of Nanocrystalline Fe-12Ni-16B-2Si Alloy Synthesis and Characterization

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

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