Effect of pre-annealing treatment on the microstructure and mechanical properties of extruded Al–Zn–Mg–Cu alloy bars

Taking extruded Al-Zn-Mg-Cu alloy (7A04 alloy) bars as the research object, the effect and mechanism of pre-annealing treatments on the microstructure and mechanical properties of the aged alloy bars were investigated. The results show that a pre-annealing treatment at 350°C for 15 h before a T6 tre...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2017-11, Vol.24 (11), p.1284-1292
Main Authors: Zhang, Zhi-hao, Xue, Jie, Jiang, Yan-bin, Jin, Feng
Format: Article
Language:English
Subjects:
alloy
Aluminum
Aluminum base alloys
Annealing
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Copper
Corrosion and Coatings
Elongation
Extrusion
Glass
Grain refinement
Grain size
hot
Magnesium
Materials Science
mechanical
Mechanical properties
Metallic Materials
Microstructure
Natural Materials
Particle size
pre-annealing
properties
Surfaces and Interfaces
Thin Films
treatment
Tribology
Zinc
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Summary:Taking extruded Al-Zn-Mg-Cu alloy (7A04 alloy) bars as the research object, the effect and mechanism of pre-annealing treatments on the microstructure and mechanical properties of the aged alloy bars were investigated. The results show that a pre-annealing treatment at 350°C for 15 h before a T6 treatment substantially reduced the sensitivity of the microstructure and mechanical properties of the extruded 7A04 aluminum alloy specimens toward the extrusion temperature. The average grain sizes of the specimens extruded at 390 and 430°C after T6 treatment were 3.4 and 8.1 μm, respectively, and their elongations to failure were 7.0% and 9.2%, respectively. However, after pre-annealing + T6 treatment, the differences in both the grain sizes and the elongations of the specimens became small, i.e., their average grain sizes were 3.2 and 3.8 μm and their elongations were 12.0% and 13.3%, respectively. For the specimens extruded at the same temperature, pre-annealing treatment obviously improved the plasticity of the alloy, which is attributed to an increase in soft texture or to grain refinement in the specimens as a result of the pre-annealing + T6 treatment.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-017-1521-3