Mechanical properties and superplasticity of AlZnMg alloys with copper and zirconium additions

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Abstract

The effect of copper and zirconium upon the high-temperature mechanical properties and the deformation mechanisms of Al-5.7 wt% Zn-2.0 wt% Mg alloys is studied. Results of impression creep and tensile tests show that the addition of Cu increases the strength of the material, and strongly enhances dynamic recovery during high-temperature deformation. In the case of the ternary AlZnMg alloy the main rate-controlling process is viscous glide, but in the alloy containing 1.4 wt% addition of Cu the strain rate is controlled by dislocation climb (10-6 s-1. <10-2 s-1 and 400°C <T <520°C). The addition of 0.14 wt% Zr to the AlZnMgCu alloy results in a fine-grained microstructure due to which the material exhibits superplastic properties at high temperatures with grain boundary sliding as the dominant process during superplastic deformation.

Original languageEnglish
Pages (from-to)583-599
Number of pages17
JournalPhysica Status Solidi (A) Applied Research
Volume149
Issue number2
Publication statusPublished - Jun 1995

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superplasticity
Superplasticity
Zirconium
Copper
mechanical properties
copper
Mechanical properties
Superplastic deformation
creep tests
Grain boundary sliding
Ternary alloys
ternary alloys
tensile tests
Temperature
strain rate
sliding
Strain rate
Creep
grain boundaries
recovery

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Mechanical properties and superplasticity of AlZnMg alloys with copper and zirconium additions",
abstract = "The effect of copper and zirconium upon the high-temperature mechanical properties and the deformation mechanisms of Al-5.7 wt{\%} Zn-2.0 wt{\%} Mg alloys is studied. Results of impression creep and tensile tests show that the addition of Cu increases the strength of the material, and strongly enhances dynamic recovery during high-temperature deformation. In the case of the ternary AlZnMg alloy the main rate-controlling process is viscous glide, but in the alloy containing 1.4 wt{\%} addition of Cu the strain rate is controlled by dislocation climb (10-6 s-1 <ε. <10-2 s-1 and 400°C <T <520°C). The addition of 0.14 wt{\%} Zr to the AlZnMgCu alloy results in a fine-grained microstructure due to which the material exhibits superplastic properties at high temperatures with grain boundary sliding as the dominant process during superplastic deformation.",
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T1 - Mechanical properties and superplasticity of AlZnMg alloys with copper and zirconium additions

AU - Chinh, N.

AU - Illy, J.

AU - Juhász, A.

AU - Lendvai, J.

PY - 1995/6

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N2 - The effect of copper and zirconium upon the high-temperature mechanical properties and the deformation mechanisms of Al-5.7 wt% Zn-2.0 wt% Mg alloys is studied. Results of impression creep and tensile tests show that the addition of Cu increases the strength of the material, and strongly enhances dynamic recovery during high-temperature deformation. In the case of the ternary AlZnMg alloy the main rate-controlling process is viscous glide, but in the alloy containing 1.4 wt% addition of Cu the strain rate is controlled by dislocation climb (10-6 s-1 <ε. <10-2 s-1 and 400°C <T <520°C). The addition of 0.14 wt% Zr to the AlZnMgCu alloy results in a fine-grained microstructure due to which the material exhibits superplastic properties at high temperatures with grain boundary sliding as the dominant process during superplastic deformation.

AB - The effect of copper and zirconium upon the high-temperature mechanical properties and the deformation mechanisms of Al-5.7 wt% Zn-2.0 wt% Mg alloys is studied. Results of impression creep and tensile tests show that the addition of Cu increases the strength of the material, and strongly enhances dynamic recovery during high-temperature deformation. In the case of the ternary AlZnMg alloy the main rate-controlling process is viscous glide, but in the alloy containing 1.4 wt% addition of Cu the strain rate is controlled by dislocation climb (10-6 s-1 <ε. <10-2 s-1 and 400°C <T <520°C). The addition of 0.14 wt% Zr to the AlZnMgCu alloy results in a fine-grained microstructure due to which the material exhibits superplastic properties at high temperatures with grain boundary sliding as the dominant process during superplastic deformation.

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