Effect of annealing on the devitrification behavior and mechanical properties of rapidly quenched Ce-based glassy alloys

Singh, D. K.; Singh, Devinder; Mandal, R.K.; Srivastava, O. N.; Tiwari, R. S.

doi:10.1016/j.jnoncrysol.2016.05.003

Cited by 10 publications

(5 citation statements)

References 45 publications

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“…Such type of observation has also been reported in other alloy systems [14,26,29,30]. Also, it is well known that Ga 3+ is normally substituted in isovalent state vis-a-vis that of Al 3+ [54][55][56][57][58][59]. However, it is worth mentioning here that Ga 1+ may possess monovalent state.…”

Section: Magnetic Propertiessupporting

confidence: 81%

Magnetic Properties of Heusler Alloys and Nanoferrites

Singh¹,

Verma²

2021

Magnetic Skyrmions

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In this chapter, results of our recent investigations on the structural, microstructural and magnetic properties of Cu-based Heusler alloys and MFe2O4 (M = Mn, Fe, Co, Ni, Cu, Zn) nanostructures will be discussed. The chapter is divided into two parts, the first part describes growth and different characterizations of Heusler alloys while in the second part magnetic properties of nano-ferrites are discussed. The Cu50Mn25Al25-xGax (x = 0, 2, 4, 8 and 10 at %) alloys have been synthesized in the form of ribbons. The alloys with x ≤ 8 show the formation of Heusler single phase of the Cu2MnAl structure. Further increase of Ga content gives rise to the formation of γ-Cu9Al4 type phase together with Cu2MnAl Heusler phase. The alloys are ferromagnetically ordered and the saturation magnetization (Ms) decreases slightly with increasing Ga concentration. Annealing of the ribbons significantly changes the magnetic properties of Cu50Mn25Al25-xGax alloys. The splitting in the zero field cooled (ZFC) and field cooled (FC) magnetization curves at low temperature has been observed for alloys. Another important class of material is Nanoferrites. The structural and magnetization behaviour of spinel MFe2O4 nanoferrites are quite different from that of bulk ferrites. X-ray diffraction study revealed spinel structure of MFe2O4 nanoparticles. The observed ferromagnetic behaviour of MFe2O4 depends on the nanostructural shape as well as ferrite inversion degree. The magnetic interactions in Ce doped CoFe2O4 are antiferromagnetic that was confirmed by zero field/field cooling measurements at 100 Oe. Log R (Ω) response measurement of MgFe2O4 thin film was taken for 10–90% relative humidity (% RH) change at 300 K.

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Section: Magnetic Propertiessupporting

confidence: 81%

Magnetic Properties of Heusler Alloys and Nanoferrites

Singh¹,

Verma²

2021

Magnetic Skyrmions

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“…The change in the electronic structure of Ce is considered as one of the important reasons for the phase separation in Ce-Al-Ga MG alloy system. The remarkable change in the behavior of glass transition with Ga substitution has been observed through DSC investigation [25][26][27][28][29][30]. The thermal stability of the studied materials has been discussed elsewhere, and for this we refer the readers to reference [27].…”

Section: Introductionmentioning

confidence: 80%

“…The models of MGs based on the nature of geometrical clusters [22] may be helpful in comprehending phase separation in these alloys. According to this model, the MGs have geometry incompatibility in main clusters with long-range translational orders and are joined by the cementing cluster known as glue cluster [23][24][25][26][27][28][29][30][31][32][33]. Sohn et al reported two general schemes for the design of phase-separating MGs [34].…”

Section: Introductionmentioning

confidence: 99%

Phase Separation in Ce-Based Metallic Glasses

Singh¹,

Mor²,

Singh³

et al. 2020

Metallic Glasses

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In this chapter, the results of our recent studies on the role of Ga substitution in place of Al in Ce 75 Al 25 − x Ga x (x = 0, 0.01, 0.1, 0.5, 1, 2, 4, and 6) metallic glasses (MGs) have been discussed with the aim to understand the genesis of phase separation. X-ray diffraction (XRD) study reveals two broad diffuse peaks corresponding to the coexistence of two amorphous phases. In order to see any change in the behavior of 4f electron of Ce, X-ray absorption spectroscopy (XAS) has been carried out for Ce 75 Al 25 − x Ga x MGs. From the XAS results, it is evident that for x = 0, the spectrum exhibits only a 4f 1 component, which basically shows a pure localized configuration of electron. After the addition of Ga, 4f electrons of Ce atoms denoted by 4f 0 are getting delocalized. Thus, the phase separation in Ce 75 Al 25 − x Ga x is taking place, owing to the formation of two types of amorphous phases having localized and delocalized 4f electrons of Ce atoms, respectively. It has been discussed how change in the electronic structure of Ce atoms may lead to phase separation in Ce 75 Al 25 − x Ga x alloys. Extensive TEM investigations have been done to study the phase separation in these alloys. The microstructural features have been compared with those obtained by phase field modeling.

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“…Hence, load to fracture decreases, and this reveals the decrease in the fracture toughness for the hydrogenated samples. The significant increase in the hardness for the qcglass composites as compared to as-synthesized ribbons has been observed, and this is due to the precipitation of nano-quasicrystal grains in the amorphous matrix [45][46][47][48][49][50][51][52][53]. Minor changes in the microhardness behavior after hydrogenation have been observed for the qc-glass composites.…”

Section: Influence Of Hydrogenation On the Structural And Microhardnementioning

confidence: 86%

Hydrogenation of Zr-Based Quasicrystals

Singh¹,

Tiwari²,

Srivastava³

2017

New Advances in Hydrogenation Processes - Fundamentals and Applications

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In this chapter, results of our recent investigations on the hydrogenation behavior of Zrbased quasicrystalline alloys and its effect on their structural and microhardness behavior have been discussed. The microstructural changes with respect to the addition of Ti and their correlation with hydrogen storage characteristics of (Zr 69.5 Al 7.5 Cu 12 Ni 11) 100−x Ti x (x = 0, 4 and 12) quasicrystalline alloys have been studied. The substitution of Ti affects the nucleation and growth characteristics of nano-quasicrystals. The grain size of quasicrystals decreases with addition of Ti. The hydrogen uptake capacity of partially quasicrystalline alloys has been improved by the addition of Ti. The alloys with x = 0, 4, and 12 absorbed 1.20 wt.%, 1.38 wt.%, and 1.56 wt.% of hydrogen, respectively. A significant effect on the structure/microstructure and mechanical behavior of (Zr 69.5 Al 7.5 Cu 12 Ni 11) 100−x Ti x quasicrystalline alloys due to hydrogenation has been observed. The change in the microhardness behavior has been discussed based on microstructural variation resulting to Ti addition. The study is focused on investigations of these materials to understand the structure (microstructure)-property correlations.

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Effect of annealing on the devitrification behavior and mechanical properties of rapidly quenched Ce-based glassy alloys

Cited by 10 publications

References 45 publications

Magnetic Properties of Heusler Alloys and Nanoferrites

Magnetic Properties of Heusler Alloys and Nanoferrites

Phase Separation in Ce-Based Metallic Glasses

Hydrogenation of Zr-Based Quasicrystals

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