Role of dissolved Fe and Si atoms on recovery and recrystallization of Al–Fe alloys and commercially pure aluminums

Yoshida, Hideo

doi:10.2464/jilm.69.500

J.JILM

2019

DOI: 10.2464/jilm.69.500

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Role of dissolved Fe and Si atoms on recovery and recrystallization of Al–Fe alloys and commercially pure aluminums

Hideo Yoshida¹

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Cited by 3 publications

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Work Softening Phenomena in Al-Fe Alloys: the Impurity-Scavenging Effect of the θ-Al13Fe4 Phase

Hara

Egusa

Mihara³

et al. 2020

J. Japan Inst. Metals and Materials

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We have investigated the work softening (WS) phenomena during a cold-roll process of an Al-Fe alloy, based on hardness measurements, electron microscopy observations, and thermodynamic calculations. The WS behavior was con rmed in the Al-Fe alloy when the rolling rate was larger than 80％, which contained ne grains with severe deformation. In contrast, the behavior and microstructural features were hardly observed in the A1050 alloy. Composition analyses showed that almost all Fe in the present Al-Fe alloy form the θ-Al 13 Fe 4 phase, in which a trace impurity element, Si, is found to be signi cantly segregated. This Si partitioning behavior is con rmed by the thermodynamic calculations and consequently leads to a higher puri cation of the relevant Al matrix as being almost close to the 4N (99.99 mol％) level, known as a scavenging effect of the impurities. It can be concluded that the highly puri ed aluminum matrix provides an intrinsic origin of the WS of the present Al-Fe alloy. Signi cant reductions of the impurities may lead to an extended mean-free path of dislocation motions and related grain boundary effects, which promote the occurrence of dynamic recovery and/or recrystallizations at severe deformation ranges even during the cold-roll process.

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Work Softening Phenomena in Al-Fe Alloys: the Impurity-Scavenging Effect of the θ-Al13Fe4 Phase

Hara

Egusa

Mihara³

et al. 2020

J. Japan Inst. Metals and Materials

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show abstract

Work Softening Phenomena in Al–Fe Alloys: The Impurity-Scavenging Effect of the θ-Al13Fe4 Phase

Hara

Egusa

Mihara³

et al. 2021

Mater. Trans.

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We have investigated the work softening (WS) phenomena during a cold-roll process of an AlFe alloy, based on hardness measurements, electron microscopy observations, and thermodynamic calculations. The WS behavior was confirmed in the AlFe alloy when the rolling rate was larger than 80%, which contained fine grains with severe deformation. In contrast, the behavior and microstructural features were hardly observed in the A1050 alloy. Composition analyses showed that almost all Fe in the present AlFe alloy form the ª-Al 13 Fe 4 phase, in which a trace impurity element, Si, is found to be significantly segregated. This Si partitioning behavior is confirmed by the thermodynamic calculations and consequently leads to a higher purification of the relevant Al matrix as being almost close to the 4N (99.99 mol%) level, known as a "scavenging effect" of the impurities. It can be concluded that the highly purified aluminum matrix provides an intrinsic origin of the WS of the present AlFe alloy. Significant reductions of the impurities may lead to an extended mean-free path of dislocation motions and related grain boundary effects, which promote the occurrence of dynamic recovery and/or recrystallizations at severe deformation ranges even during the cold-roll process.

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Kinetic analysis of precipitation process in the two-step age hardening of an Al-6%Zn-0.75%Mg alloy

Yoshida,

Mihara-Narita,

Tanaka

2024

J.JILM

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Yamamotoʼs rate equation was applied to two-step age hardening of an Al-6%Zn-0.75%Mg alloy. All aging processes at 160-200°C were described as the sum of three precipitation reactions, that is, spherical, plate-like, and rod-like precipitation independent of the holding time at room temperature (RT). These results agreed with the observation of TEM microstructures. Based on the activation energy of diffusion calculated from the rate equation, it was suggested that the diffusion of zinc controlled the spherical precipitation reaction, and the diffusion of magnesium did the rod-like one. The plate-like precipitation reaction which depended on the holding time at RT is controlled by the diffusion of zinc for a short time and the one of magnesium for a long time. These precipitation reactions were related to the meta-stable and stable phase particles. The comparison between electrical resistivity (ER) and Vickers hardness (HV) changes at 160°C aging showed that the HV change was faster than ER one in the long holding time at RT. On the other hand, the ER change became faster than HV change in the short one at RT. This difference is related to the formation of clusters and GP zones that are formed by holding at room temperature.

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Role of dissolved Fe and Si atoms on recovery and recrystallization of Al–Fe alloys and commercially pure aluminums

Cited by 3 publications

References 3 publications

Work Softening Phenomena in Al-Fe Alloys: the Impurity-Scavenging Effect of the <i>θ</i>-Al<sub>13</sub>Fe<sub>4</sub> Phase

Work Softening Phenomena in Al-Fe Alloys: the Impurity-Scavenging Effect of the <i>θ</i>-Al<sub>13</sub>Fe<sub>4</sub> Phase

Work Softening Phenomena in Al–Fe Alloys: The Impurity-Scavenging Effect of the θ-Al<sub>13</sub>Fe<sub>4</sub> Phase

Kinetic analysis of precipitation process in the two-step age hardening of an Al-6%Zn-0.75%Mg alloy

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