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Erschienen in:
2016 | OriginalPaper | Buchkapitel
High Strength Nanostructured Al-Zn-Mg-Cu-Zr Alloy Manufactured by High-Pressure Torsion
verfasst von : Chao An, Huimin Lu, Shilai Yuan
Erschienen in: Light Metals 2013
Verlag: Springer International Publishing
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7085 aluminium alloy (Al-7.5 Zn-1.6 Mg-1.5 Cu-0.12 Zr) is processed by high-pressure torsion (HPT) at imposed pressure of 2 GPa and torsion turns of 3, 6, 9 and 12 turns. The microstructures and mechanical properties of 7085 Al alloy under different torsion conditions are systematically investigated, and the refinement mechanism is discussed. The microstructures of the alloy are analyzed by transmission electron microscope (TEM) and scanning electron microscope (SEM). Mechanical properties are studied by tension test and vickers indentation. The results indicate that after HPT treatment, the grains of Al alloy are refined remarkably. Nanometer grains of sizes between 50~250 nm are obtained. The tensile strength and hardness increase obviously and there is some fluctuations in elongation. When the pressure is 2 GPa and the torsion turn is 12 turns, the optimum performance are accomplished, which tensile strength is 699 MPa and microhardness is 260HV0.2.