비만아 부모의 돌봄 경험: q 방법론

A critical review of experimental results and constitutive descriptions for metals and alloys in hot working

Strengthening mechanisms of an Al-Mg-Sc-Zr alloy

Recent advances in ageing of 7xxx series aluminum alloys: A physical metallurgy perspective

Compressive and fatigue behavior of beta-type titanium porous structures fabricated by electron beam melting

A series of Al–Mg based alloy plates with thickness of 4 mm containing minor Sc and Zr were prepared. Tensile properties and microstructures of the alloys were studied. The results show that adding 0.2% Sc and 0.1% Zr to Al–5Mg alloy, the strength of the alloy increased by 150 MPa. Strengthening effect is the most outstanding among all minor alloying elements in aluminum alloys. Strength increment caused by adding minor Sc and Zr is attributed mainly to fine grain strengthening, precipitation strengthening of Al3(Sc, Zr) and substructure strengthening.

Effect of minor Sc and Zr on the microstructure and mechanical properties of Al–Mg based alloys

Influence of retrogression and re-aging treatment on corrosion behaviour of an Al–Zn–Mg–Cu alloy

Effect of Sc and Zr additions on corrosion behaviour of Al–Zn–Mg–Cu alloys

The effects of aging treatments on mechanical property and corrosion behavior of spray formed 7055 aluminium alloy

The hot deformation behavior of Al–Cu–Li–Sc–Zr alloy and its microstructure evolution were investigated by isothermal compression tests under various deformation conditions. The tests were carried out in the deformation temperature range between 380 and 500 °C and at strain rates between 0.001 and 10 s −1 . The constitutive model based on the hyperbolic-sine equation was established to characterize the dependence of flow stress on strain, strain rate and deformation temperature. Based on the experimental data and dynamic materials model, the processing maps at strain of 0.4 and 0.6 were generated to demonstrate the hot workability of the alloy. The results show that the flow stress decreases with increasing deformation temperature, and increases with increasing strain rate. The main softening mechanism is dynamic recovery at 440 °C/0.1 s −1 ; the dynamic recrystallization of the alloy can be easily observed at 470 °C/0.001 s −1 , with peak efficiency of power dissipation of around 57%. With increasing deformation temperature, the volume fraction of dynamic recrystallization increases. At strains of 0.4 and 0.6, the flow instability domain is found at higher strain rates (>0.3 s −1 ), which mainly locates at the upper part of processing maps. On the basis of processing maps and microstructure evolution, the optimum hot working parameters are in deformation temperature range from 460 to 500 °C and at strain rate range from 0.001 to 0.1 s −1 with higher power efficiency of around 42–60%.

Characterization of hot deformation behavior of as-homogenized Al–Cu–Li–Sc–Zr alloy using processing maps

Qinglin Pan

Papers

Effect of minor Sc and Zr on the microstructure and mechanical properties of Al–Mg based alloys

Influence of retrogression and re-aging treatment on corrosion behaviour of an Al–Zn–Mg–Cu alloy

Effect of Sc and Zr additions on corrosion behaviour of Al–Zn–Mg–Cu alloys

The effects of aging treatments on mechanical property and corrosion behavior of spray formed 7055 aluminium alloy

Characterization of hot deformation behavior of as-homogenized Al–Cu–Li–Sc–Zr alloy using processing maps