Effect of cooling rate on the crystallization and mechanical behaviour of Zr–Ga–Cu–Ni metallic glass composition

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

doi:10.1016/j.jallcom.2015.06.275

Cited by 38 publications

(10 citation statements)

References 55 publications

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“…The Cu 50 Mn 25 Al 25-x Ga x (x = 0, 2, 4, 8 and 10) alloys with a thickness of ∼40 to 50 μm and lengths of ∼1 to 2 cm has been synthesized using melt spinning technique [24]. The substitution of Ga in place of Al is of special interest as it does not significantly change the lattice constant and the valence electron ratio (e/a) of the investigated alloy system [42][43][44][45][46][47][48][49]. The effect of heat treatment on the magnetic and phase transformation behaviour of Cu 50 Mn 25 Al 25-x Ga x ribbons will be discussed.…”

Section: Structure/microstructure and Magnetic Properties Of Heusler Alloysmentioning

confidence: 99%

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: Structure/microstructure and Magnetic Properties Of Heusler Alloysmentioning

confidence: 99%

Magnetic Properties of Heusler Alloys and Nanoferrites

Singh¹,

Verma²

2021

Magnetic Skyrmions

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“…In this respect, Ga substitution on the Al site seems to be ideal. The substitution of Ga in Zr 69.5 Al 7.5-x Ga x Cu 12 Ni 11 alloys results in a change from a two-step crystallization (x = 0) to a single-step one (x = 7.5) [14,15]. For x = 0, we have the well investigated Zr-based alloy; and for x = 7.5, we have come out with a new composition of glass with T g = 614 K [16][17][18][19][20].…”

Section: Effect Of Materials Tailoring On the Mechanical Propertiesmentioning

confidence: 99%

“…(b) TEM image and the corresponding diffraction pattern of as-synthesized Zr 69.5 Ga 7.5 Cu 12 Ni 11 alloy. (Reprinted with kind permission from references[15,19], Copyright 2015 and 2011, Elsevier. )…”

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confidence: 99%

Mechanical Behavior of Zr-Based Metallic Glasses and Their Nanocomposites

Singh¹,

Mandal²,

Tiwari³

et al. 2016

Metallic Glasses - Formation and Properties

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In the present chapter, results of our recent investigations on the role of gallium (Ga) on the aluminum (Al) site in Zr 69.5 Al 7.5-x Ga x Cu 12 Ni 11 metallic glass (MG) composition have been discussed. The material tailoring and cooling rate effects on the mechanical behavior of Zr-based metallic glasses and their nanocomposites have been studied. The substitution of Ga on the Al site in Zr-Al-Cu-Ni alloy affects the nucleation and growth characteristics of quasicrystals (QCs) and consequently changes the morphology of nanoquasicrystals. The Zr 69.5 Al 7.5-x Ga x Cu 12 Ni 11 system displayed metallic glass formation in the range of x = 0-7.5. In this process, we have come out with a new glass composition; Zr-Ga-Cu-Ni with glass transition temperature (T g)-614 K. The effect of cooling rate on the glass forming ability (GFA) and mechanical properties for this new metallic glass composition has been discussed and compared with some other Zrbased metallic glasses. The various indentation parameters such as microhardness, yield strength, strain hardening constant, nature of shear band formation, and so on for the alloys have been analyzed. The study is focused on investigations of these materials to understand the structure (microstructure) property correlations.

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“…A new idea of ordered but non-periodic arrangement of atoms exhibiting sharp diffraction peaks (with icosahedral symmetry) is created due to the breakthrough experiments by Shechtman et al [14] on rapidly quenched alloys (AlMn) using TEM. Due to the aperiodicity, these materials can be used for applications in industries as they are having properties different from that of conventional metallic materials [15][16][17][18][19][20][21][22][23][24]. Quasicrystals are known by a group of different properties, for example, higher hardness, low friction, low-surface energy, and thermal expansion which is as good as metals [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%