The influence of artificial aging on the microstructure and hardness of an Al–Zn–Mg–Zr alloy processed by equal-channel angular pressing

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Abstract

The effect of artificial aging on the microstructure and hardness of an ultrafine-grained (UFG) Al–4.8%Zn–1.2%Mg–0.14%Zr (wt%) alloy was studied. The UFG microstructure with an average grain size of about 260 nm was obtained by severe plastic deformation applying four passes of equal-channel angular pressing (ECAP) at room temperature. Then, artificial aging was performed on the ECAP-processed samples at 120 °C and 170 °C for 2 h. In the ECAP-processed sample Guinier–Preston (GP) zones, MgZn 2 precipitates and a high dislocation density were observed. After aging at 120 °C, coarse MgZn 2 precipitates were formed in the grain boundaries, leading to softening, while the dislocation density did not decrease. Annealing at 170 °C yielded a growth of the matrix grains to ~ 530 nm with a significant decrease in the dislocation density. In addition, GP zones disappeared and MgZn 2 precipitates were formed in both the grain interiors and the boundaries. This overaging of the precipitate structure and the decrease in the dislocation density resulted in a lower hardness than after annealing at 120 °C. It was found that the hardness reduction due to the change of the precipitate structure at 170 °C was higher than that caused by the decrease in the dislocation density.

Original languageEnglish
Pages (from-to)10918-10928
Number of pages11
JournalJournal of Materials Science
Volume54
Issue number15
DOIs
Publication statusPublished - Aug 15 2019

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Equal channel angular pressing
Precipitates
Aging of materials
Hardness
Microstructure
Annealing
Dislocations (crystals)
Plastic deformation
Grain boundaries

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "The influence of artificial aging on the microstructure and hardness of an Al–Zn–Mg–Zr alloy processed by equal-channel angular pressing",
abstract = "The effect of artificial aging on the microstructure and hardness of an ultrafine-grained (UFG) Al–4.8{\%}Zn–1.2{\%}Mg–0.14{\%}Zr (wt{\%}) alloy was studied. The UFG microstructure with an average grain size of about 260 nm was obtained by severe plastic deformation applying four passes of equal-channel angular pressing (ECAP) at room temperature. Then, artificial aging was performed on the ECAP-processed samples at 120 °C and 170 °C for 2 h. In the ECAP-processed sample Guinier–Preston (GP) zones, MgZn 2 precipitates and a high dislocation density were observed. After aging at 120 °C, coarse MgZn 2 precipitates were formed in the grain boundaries, leading to softening, while the dislocation density did not decrease. Annealing at 170 °C yielded a growth of the matrix grains to ~ 530 nm with a significant decrease in the dislocation density. In addition, GP zones disappeared and MgZn 2 precipitates were formed in both the grain interiors and the boundaries. This overaging of the precipitate structure and the decrease in the dislocation density resulted in a lower hardness than after annealing at 120 °C. It was found that the hardness reduction due to the change of the precipitate structure at 170 °C was higher than that caused by the decrease in the dislocation density.",
author = "J. Gubicza and J. L{\'a}b{\'a}r and J. Lendvai and N. Chinh",
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AU - Chinh, N.

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AB - The effect of artificial aging on the microstructure and hardness of an ultrafine-grained (UFG) Al–4.8%Zn–1.2%Mg–0.14%Zr (wt%) alloy was studied. The UFG microstructure with an average grain size of about 260 nm was obtained by severe plastic deformation applying four passes of equal-channel angular pressing (ECAP) at room temperature. Then, artificial aging was performed on the ECAP-processed samples at 120 °C and 170 °C for 2 h. In the ECAP-processed sample Guinier–Preston (GP) zones, MgZn 2 precipitates and a high dislocation density were observed. After aging at 120 °C, coarse MgZn 2 precipitates were formed in the grain boundaries, leading to softening, while the dislocation density did not decrease. Annealing at 170 °C yielded a growth of the matrix grains to ~ 530 nm with a significant decrease in the dislocation density. In addition, GP zones disappeared and MgZn 2 precipitates were formed in both the grain interiors and the boundaries. This overaging of the precipitate structure and the decrease in the dislocation density resulted in a lower hardness than after annealing at 120 °C. It was found that the hardness reduction due to the change of the precipitate structure at 170 °C was higher than that caused by the decrease in the dislocation density.

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