Ordering processes in Fe-Ga alloys studied by positron annihilation lifetime spectroscopy

Dubov, L Yu; Shtotsky, Yu V; Akmalova, Yu A; Funtikov, Yu. V.; Palacheva, V.V.; Базлов, А. И.; Golovin, I.S.

doi:10.1016/j.matlet.2016.02.051

Cited by 18 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One can obtain more detailed information on the interpretation of transition metals ACAR spectra and the approximation method from the articles [24,25]. It was mentioned earlier [17][18][26][27][28][29][30] that the intensity of the 15-18 mrad wide Gaussian-3 correlates with the d-shell occupancy of transition group metals.…”

Section: Resultsmentioning

confidence: 99%

D-shell of iron atom of the amorphous FeCr₁₅B₁₅alloy effective charge change during the crystallization

Khmelevsky

Funtikov

Aksenenko

et al. 2017

Mechanics & Industry

View full text Add to dashboard Cite

An amorphous metal alloy of the FeCrB system was studied during the crystallization by thermal annealing. Such an alloy is a perspective candidate for the role of an intermediate layer in multilayer covering for cutting tools. By the using of the thermoelectric voltage measurement, positron annihilation spectroscopy, and X-ray photoelectron spectroscopy, the conjoint research was performed for the study of the conduction and delectron band state in the amorphous metallic alloy FeCr 15 B 15 , which intersects each other by the energy. The results of all the studies agree with each other and indicate the change in the effective charge of the d-shell by 1 electron during crystallization.

show abstract

Section: Resultsmentioning

confidence: 99%

D-shell of iron atom of the amorphous FeCr₁₅B₁₅alloy effective charge change during the crystallization

Khmelevsky

Funtikov

Aksenenko

et al. 2017

Mechanics & Industry

View full text Add to dashboard Cite

show abstract

“…It was proposed that the nature of this P3 (or P Tr1 ) peak is due to annihilation of thermal vacancies and ordering (the P3 is not shown in Figure 6 , where only results at fixed temperatures are used). Later effects of annihilation of thermal vacancies and ordering were confirmed by positron annihilation and neutron diffraction methods [ 22 , 36 , 59 ];…”

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

“…These experimental observations are also in agreement with the above-mentioned papers, but the conclusion about the mechanism is different. Fang et al concluded that the potential mechanism of the P wq peak originates from the transition of Ga-rich Guinier-Preston zones to D0 3 structures or lattice relaxation related to Ga-rich zones, while Golovin et al explained it by combination of two processes: decrease in thermal vacancy concentration and ordering of rapidly cooled samples [ 22 , 36 , 59 ]. Nevertheless, both interpretations agree that atomic ordering is involved.…”

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

“…Similar ideas were proposed for Fe–Al [ 143 ] and Fe–Cr alloys [ 144 ]. The arguments in favor of this hypothesis are a decrease in the P1 peak effect after annealing, which leads to a drastic decrease in vacancy concentration in Fe–Ga alloys [ 22 ], and the experimental values of characteristic relaxation times, which are in favor of the point defect relaxation.…”

Section: Anelastic Effects In Binary Fe–ga and Ternary Fe–ga-based Al...mentioning

confidence: 99%

“…In (Fe–25–28)Ga alloys, the recorded sequence of first-order phase transitions upon heating is D0 3 → L1 2 → D0 19 → B2/A2 (depending on the heating rate: A2 for 2 K/min or B2 for 1 K/min). A second-order A2 → D0 3 transition precedes the sequence of first-order transitions if only a surface of the directly solidified or quenched samples is analyzed by XRD [ 21 ] and position annihilation [ 22 ] studies. The range of the D0 3 → L1 2 transition depends greatly on the heating rate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

Golovin

2023

Materials

View full text Add to dashboard Cite

Fe–Ga alloys (GalFeNOLs) are the focus of attention due to their enhanced magneto-elastic properties, namely, magnetostriction in low saturation magnetic fields. In the last several years, special attention has been paid to the anelastic properties of these alloys. In this review, we collected and analyzed the frequency-, amplitude-, and temperature-dependent anelasticity in Fe–Ga and Fe–Ga-based alloys in the Hertz range of forced and free-decay vibrations. Special attention is paid to anelasticity caused by phase transitions: for this purpose, in situ neutron diffraction tests with the same heating or cooling rates were carried out in parallel with temperature dependencies measurements to control ctructure and phase transitions. The main part of this review is devoted to anelastic effects in binary Fe–Ga alloys, but we also consider ternary alloys of the systems Fe–Ga–Al and Fe–Ga–RE (RE—Rare Earth elements) to discuss similarities and differences between anelastic properties in Fe–Ga and Fe–Al alloys and effect of RE elements. We report and discuss several thermally activated effects, including Zener- and Snoek-type relaxation, several transient anelastic phenomena caused by phase transitions (D03 ↔ A2, D03 → L12, L12 ↔ D019, D019 ↔ B2, Fe13Ga9 → L12+Fe6Ga5 phases), and their influence on the above-mentioned thermally activated effects. We also report amplitude-dependent damping caused by dislocations and magnetic domain walls and try to understand the paradox between the Smith–Birchak model predicting higher damping capacity for materials with higher saturation magnetostriction and existing experimental results. The main attention in this review is paid to alloys with 17–20 and 25–30%Ga as the alloys with the best functional (magnetostriction) properties. Nevertheless, we provide information on a broader range of alloys from 6 to 45%Ga. Due to the limited space, we do not discuss other mechanical and physical properties in depth but focus on anelasticity. A short introduction to the theory of anelasticity precedes the main part of this review of anelastic effects in Fe–Ga and related alloys and unsolved issues are collected in summary.

show abstract

Fe13Ga9 intermetallic in bcc-base Fe–Ga alloy

et al. 2021

View full text Add to dashboard Cite

Ordering processes in Fe-Ga alloys studied by positron annihilation lifetime spectroscopy

Cited by 18 publications

References 20 publications

D-shell of iron atom of the amorphous FeCr₁₅B₁₅alloy effective charge change during the crystallization

D-shell of iron atom of the amorphous FeCr₁₅B₁₅alloy effective charge change during the crystallization

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

Fe13Ga9 intermetallic in bcc-base Fe–Ga alloy

Contact Info

Product

Resources

About

Ordering processes in Fe-Ga alloys studied by positron annihilation lifetime spectroscopy

Cited by 18 publications

References 20 publications

D-shell of iron atom of the amorphous FeCr15B15alloy effective charge change during the crystallization

D-shell of iron atom of the amorphous FeCr15B15alloy effective charge change during the crystallization

Anelastic Effects in Fe–Ga and Fe–Ga-Based Alloys: A Review

Fe13Ga9 intermetallic in bcc-base Fe–Ga alloy

Contact Info

Product

Resources

About

D-shell of iron atom of the amorphous FeCr₁₅B₁₅alloy effective charge change during the crystallization

D-shell of iron atom of the amorphous FeCr₁₅B₁₅alloy effective charge change during the crystallization