Formation of nanocrystalline structures in a Co–Al system by mechanical alloying and leaching

Голубкова, Г. В.; Lomovsky, O. I.; Kwon, Young Soon; Власов, А. А.

doi:10.1016/s0925-8388(02)01083-6

“…Prior to indentation, the surfaces of samples were polished using a series of sandpaper with increasing grits followed by application of a series of diamond pastes. This behavior has also been observed in the work of Golubkova et al [31]. They report that CoAl was formed after one hour of MA.…”

Section: Methodssupporting

confidence: 84%

Evolution of microstructural and mechanical properties of nanocrystalline Co₂FeAl Heusler alloy prepared by mechanical alloying

Hakimi

¹

,

Kameli

²

,

Salamati

³

et al. 2013

View full text Add to dashboard Cite

Mechanical alloying (MA) has been used to fabricate the Co 2 FeAl Heusler alloy with a nanocrystalline structure. The formation mechanism of the alloy has been investigated.Rietveld analysis showed that all samples that were milled for more than 15 hours had an L2 1 structure with a space group of Fm3m. The crystallite size and internal strain of the samples were calculated using the Williamson-Hall equation. With mechanical alloying of up to 20 hours the crystallite size of Co 2 FeAl increased, after which the crystallite size started to decrease. In contrast, internal strain first decreased during the process and then increased with the increase of milling time. The powder obtained after 20 hours of MA was split into three parts and separately annealed at 300, 500 and 700 o C for 5 hours. A considerable increase was observed in the hardness value of powder particles with the increase of annealing temperature up to 500 o C. However, the hardness value of the sample annealed at 700 o C decreased. It seems that this feature is related to parameters such as increase of crystallite size, enhancement of lattice ordering, change in density of defects and impurities and nonstoichiometric effects.

show abstract

“…This behavior has also been observed in the work of Golubkova et al [31]. They report that CoAl was formed after one hour of MA.…”

Section: Resultssupporting

confidence: 84%

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co ₂ Cr _{1−
x} Fe _x Al Heusler alloys prepared by mechanical alloying

Hakimi

¹

,

Kameli

²

,

Salamati

³

et al. 2012

Chinese Phys. B

0

View full text Add to dashboard Cite

Mechanical alloying (MA) has been used to fabricate the Co 2 FeAl Heusler alloy with a nanocrystalline structure. The formation mechanism of the alloy has been investigated.Rietveld analysis showed that all samples that were milled for more than 15 hours had an L2 1 structure with a space group of Fm3m. The crystallite size and internal strain of the samples were calculated using the Williamson-Hall equation. With mechanical alloying of up to 20 hours the crystallite size of Co 2 FeAl increased, after which the crystallite size started to decrease. In contrast, internal strain first decreased during the process and then increased with the increase of milling time. The powder obtained after 20 hours of MA was split into three parts and separately annealed at 300, 500 and 700 o C for 5 hours. A considerable increase was observed in the hardness value of powder particles with the increase of annealing temperature up to 500 o C. However, the hardness value of the sample annealed at 700 o C decreased. It seems that this feature is related to parameters such as increase of crystallite size, enhancement of lattice ordering, change in density of defects and impurities and nonstoichiometric effects.

show abstract

“…These results also imply that chemical reactions occurring during high-energy mechanical milling may involve components that are in an X-ray amorphous state. These phases can be detected and studied only by methods of a high sensitivity, such as the DD method [11,12,22]. Additional peaks in the XRD patterns marked by arrows (Fig.…”

Section: Phasementioning

confidence: 99%

Phase evolution during early stages of mechanical alloying of Cu–13 wt.% Al powder mixtures in a high-energy ball mill

Dudina

¹

,

Lomovsky

²

,

Valeev

³

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Formation of nanocrystalline structures in a Co–Al system by mechanical alloying and leaching

Cited by 18 publications

References 7 publications

Evolution of microstructural and mechanical properties of nanocrystalline Co₂FeAl Heusler alloy prepared by mechanical alloying

Evolution of microstructural and mechanical properties of nanocrystalline Co₂FeAl Heusler alloy prepared by mechanical alloying

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co ₂ Cr _{1−
x} Fe _x Al Heusler alloys prepared by mechanical alloying

Phase evolution during early stages of mechanical alloying of Cu–13 wt.% Al powder mixtures in a high-energy ball mill

Contact Info

Product

Resources

About

Formation of nanocrystalline structures in a Co–Al system by mechanical alloying and leaching

Cited by 18 publications

References 7 publications

Evolution of microstructural and mechanical properties of nanocrystalline Co2FeAl Heusler alloy prepared by mechanical alloying

Evolution of microstructural and mechanical properties of nanocrystalline Co2FeAl Heusler alloy prepared by mechanical alloying

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co 2 Cr 1− x Fe x Al Heusler alloys prepared by mechanical alloying

Phase evolution during early stages of mechanical alloying of Cu–13 wt.% Al powder mixtures in a high-energy ball mill

Contact Info

Product

Resources

About

Evolution of microstructural and mechanical properties of nanocrystalline Co₂FeAl Heusler alloy prepared by mechanical alloying

Evolution of microstructural and mechanical properties of nanocrystalline Co₂FeAl Heusler alloy prepared by mechanical alloying

The effect of Fe doping on structural and magnetic properties of nanocrystallite Co ₂ Cr _{1−
x} Fe _x Al Heusler alloys prepared by mechanical alloying