Influence of pre-stretching on quench sensitive effect of high-strength Al−Zn−Mg−Cu-Zr alloy sheet
| Autor: | Qun Li, Xinming Zhang, Kechao Zhou, Ke-zhun He, Shengdan Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Quenching
Materials science Alloy technology industry and agriculture Metals and Alloys General Engineering engineering.material equipment and supplies Microstructure Differential scanning calorimetry Transmission electron microscopy Ultimate tensile strength engineering Deformation (engineering) Composite material Tensile testing |
| Zdroj: | Journal of Central South University. 28:2660-2669 |
| ISSN: | 2227-5223 2095-2899 |
| Popis: | The influence of pre-stretching on quench sensitive effect of high strength Al−Zn−Mg−Cu−Zr alloy AA 7085 sheet was investigated by tensile testing at room temperature, transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The water-cooled and aged alloy exhibits higher strength than the air-cooled and aged alloy; 2.5% pre-stretching of tensile deformation exerts little effect on strength of water-cooled and aged alloy but increases that of air-cooled and aged one, and therefore the yield strength reduction rate due to slow quenching decreases from about 3.8 % to about 1.0 %, reducing quench sensitive effect. For the air-cooled alloy, pre-stretching increases the sizes of η′ strengthening precipitates but also increases their quantity and the ratio of diameter to thickness, resulting in enhanced strengthening and higher strength after aging. The reason has been discussed based on microstructure examination by TEM and DSC. |
| Databáze: | OpenAIRE |
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