Phase relations in the Cu-poor part of the Ce–Al–Cu system at 503K

Yao, Qingrong; Hu, Xiaodong; Chen, X.J.; Pan, Shunkang; Zou, Wenming; Wang, H.L.; Wang, Y.C.; Wang, P.P.; Liu, F.; Wang, Z.M.; Zhou, Huaiying; Tang, Chengying

doi:10.1016/j.jallcom.2009.03.126

Cited by 9 publications

(5 citation statements)

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“…The materials outside the solubility range become inhomogeneous (multiphase samples). 20,23 Magnetization measurements indicate the a-axis as the easy magnetization axis for all x and a clear strengthening of the ferromagnetic interactions with decreasing Cu content. 24,25,23,26 The energy of the first CEF excitation was first reported to increase roughly linearly from ∼0.75 meV (for x = 1.10) to ∼2 meV (for x = 0.70) as deduced from magnetization measurements.…”

Section: Introductionmentioning

confidence: 92%

“…22 It orders anti-ferromagnetically below 2.7 K (slightly sample-dependent). [17][18][19][20][21]16 The amplitude-modulated magnetic structure with in-plane magnetic moments described by the propagation vector (0.4, 0.6, 0) was revealed recently. 16 The most intriguing feature is the presence of three magnetic (magneto-phonon) excitations observed by inelastic neutron scattering, 6 while only two excitations from the ground state can be explained by the standard CEF model for tetragonal point-group symmetry of Ce ions.…”

Section: Introductionmentioning

confidence: 99%

“…CeCu x Al 4– x solid solutions form in the solubility range with 0.70 < x ≤ 1.10. , They adopt a tetragonal structure that derives from BaNiSn 3 -type (i.e., structure of pure CeCuAl 3 ) by partial Cu–Al disorder presumably on the 2a positions. The materials outside the solubility range become inhomogeneous (multiphase samples). , Magnetization measurements indicate the a -axis as the easy magnetization axis for all x and a clear strengthening of the ferromagnetic interactions with decreasing Cu content. ,,, The energy of the first CEF excitation was first reported to increase roughly linearly from ∼0.75 meV (for x = 1.10) to ∼2 meV (for x = 0.70) as deduced from magnetization measurements. , However, such a scenario was excluded on the basis of the specific heat study indicating significantly higher splitting for CeCu 0.70 Al 3.30 and CeCu 0.75 Al 3.25 . , In the present study, we aim to follow the evolution of the energy spectra in the CeCu x Al 4– x system directly by inelastic neutron scattering and investigate how the <vibron> states evolve with the Cu–Al substitution.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Structure and Excitations in CeCu_xAl_4–x System

et al. 2017

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CeCuAl crystallizing in the tetragonal BaNiSn-type structure and CeCuAl solid solutions were investigated by means of elastic and inelastic neutron scattering. Powder neutron diffraction brought information on both temperature evolution of crystallographic parameters and magnetic order at low temperatures. No structural change was observed in the investigated temperature range from 1.5 to 300 K. Weak magnetic peaks outside nuclear Bragg positions observed in solid solutions with 0.90 ≤ x ≤ 1.10 were described by the propagation vector k = (0.40 + δ, 0.60 + δ, 0), where δ ≈ 0.02 and δ ≈ 0.01. The magnetic structure of CeCuAl consists of two components: an anti-ferromagnetic one described by the same k and a ferromagnetic one with k = (0, 0, 0) and magnetic moments lying within the tetragonal basal plane. The evolution of magnetic excitations as a function of Cu-Al concentration in CeCuAl was studied by inelastic neutron scattering. The measured spectra of CeCuAl and the solution with x = 0.95 point to a three-magnetic-peak energy scheme, while only two excitations are expected from the local symmetry conditions on Ce atoms. The standard two-peak spectrum of crystal electric field excitations was observed for Cu-Al substitutions further from the 1:1:3 stoichiometry (x = 0.75 and 1.10). The intermediate concentrations (x = 0.90 and 1.05) exhibit spectra on the border between the former cases with a less clear pronounced first inelastic magnetic peak. The observed behavior is discussed considering the evolution of structural parameters in the CeCuAl system and the coupling between the lattice vibrations and the crystal electric field excitations.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic Structure and Excitations in CeCu_xAl_4–x System

et al. 2017

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“…Al 20 (Ti, V) 2 RE is suggested to have two chemical formula as Al 20 (Ti 0.25 , V 0.75 ) 2 RE and Al 20 (Ti 0.5 , V 0.5 ) 2 RE, and the total atom fraction of Ti and V is close to 8.7 %, which indicates that Ti and V have a replacement with each other. Al 8 Cu 4 RE phase is also indentified in this study, which belongs to Al 12 -x Cu x Ce (4.0 B x B 4.5), with ThMn 12 -type tetragonal structure and space group of I4/mmm [17]. It results from the dendritic segregation of RE elements which consequently react with eutectic Al 2 Cu to form new ternary RE-containing phase.…”

Section: Formation Of Intermetallicsmentioning

confidence: 80%

Dual characteristic of trace rare earth elements in a commercial casting Al–Cu–X alloy

Hao

Han

2014

Rare Met.

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The effect of rare earth elements on microstructure and mechanical properties of casting Al-Cu-X alloy (X = Mn, Ti, V, Cd, Zr) was investigated in as-cast and T6 conditions. Microstructure evolution was characterized by optical microscopy, scanning electron microscopy, and transmission electron microscopy. REcontaining intermetallic compounds (IMCs) formed in this alloy were indentified by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). It is shown that the additions of RE (60Ce-40La, wt%) result in the formation of Ce-rich blocky-shaped Al 20 (Ti, V) 2 RE and La-rich skeletal-shaped Al 8 Cu 4 RE. Tensile results of samples after T6 treatment indicate that the strength and ductility increase slightly to 480 MPa and 9.7 %, respectively, with RE content increasing from 0 wt% to 0.3 wt%. This is due to the combinative hardening effects of reduced grain size, enhanced precipitation of h 0 (Al 2 Cu) phase and Al 20 Cu 2 Mn 3 dispersed particles, and minor La-rich IMCs at the grain boundaries of a-Al dendrites. The decrease of strength of 0.5 wt% RE-added sample is ascribed to the aggregation of Al 20 (Ti, V) 2 RE IMCs inside the grains. The dual characteristic of rare earth elements was also discussed in terms of its positive and negative effects on mechanical properties.

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“…For example, information on the eutectic reactions and thermodynamic quantities of the liquid phase is critical for the evaluation of the glass forming regions in the metallic glass alloys. Therefore, a research project to construct a thermodynamic database of the Ce-based alloys via experiments and assessments is performed [11].…”

Section: Introductionmentioning

confidence: 99%