High-strength aluminium-based alloys

2019-08-14 09:28:24

alloys based Al plastic phases

责任者: Fogagnolo, J.B.;Rodrigues, C.A.D.;Bolfarini, C.;Kiminami, C.S.;Botta, W.J.F. 单位: Univ. Federal de Sao Carlos, Depto. de Engenharia de Materials, 13565-905 Sao Carlos, SP, Brazil 来源出处: Journal of Metastable and Nanocrystalline Materials,2004,22():27-32 摘要: Aluminium-based nanostructured alloys can present values of mechanical strength which are equivalent to the ones observed for high-strength steels. Several microstructures can be responsible for such properties, as examples, a dispersion of nanocrystalline phases in an amorphous matrix or a mixture of nanocrystalline and quasicrystalline phases. In the present work we report on the production of microstructures of such types in useful thickness for mechanical applications. We have used high-energy ball milling and gas atomisation to produce nanostructure precursors in two different Al-based systems, Al-Fe-Zr and Al-Ni-Y-Co. These precursors were then consolidated by two processes: hot-extrusion and severe plastic deformation. Both, the precursors and the consolidated alloys have been characterised by X-rays diffraction, differential scanning calorimetry and scanning and transmission electron microscopy. Mechanical evaluation carried out by compression tests and hardness measurements indicated promising results in both systems. 关键词: Aluminum alloys;Strength of materials;Nanostructured materials;Extrusion;Compaction;Hardness;Microstructure;Atomization;Compressive stress;Differential scanning calorimetry;X ray diffraction;Transmission electron microscopy;Nanocrystalline phases;Quasicrystalline phases;Severe plastic deformation (SPD);Severe plastic torsion straining (SPTS)