Effect of Scandium Content on the Structure and Properties of Alloy Al – 4.5% Zn – 4.5% Mg – 1% Cu – 0.12% Zr

Metal Science and Heat Treatment - The effect of scandium content on the structure and properties of alloy Al – 4.5% Zn – 4.5% Mg – 1% Cu – 0.12% Zr is determined. The...     

Relationship Between the Strengthening Effect and the Morphology of Precipitates in Al–7.4Zn–1.7Mg–2.0Cu Alloy

The morphological evolution of the precipitates in Al–7.4Zn–1.7Mg–2.0Cu(wt%) alloy was studied by highresolution transmission electron microscopy(HRTEM). Statistics reveal that the hardness of the alloy changes accordingly with the change of the average thickness–diameter ratio of precipitates. The GPII zones are mainly responsible for the first and also the highest hardness peak. They grow in diameter and keep 7-atomic-layer in thickness. Once the thickness changes, the phase transformation from GPII zone to g0 or g-precursor would occur. The resultant metastable g0 and g-precursor precipitates grow in both diameter and thickness, but much faster in the former. After the first hardness peak,the metastable g0 precipitates and g-precursor, coexisting with part of GPII zones, are counted as the main hardening precipitates.     

Influence of Trace Additions of Silver on the Stress Corrosion of an Al–4% Zn–3% Mg Alloy

Abstract

Direct measurement of the magnesium solute distributions occurring around grain boundaries in aged Al–4% Zn–3% Mg alloy with and without trace additions of silver has shown that the segregation behaviour of the magnesium is not influenced by the presence of the silver. It has been shown that reported improvements in the stress corrosion resistance of the ternary alloy resulting from trace additions of silver are not due to any effect on either the magnesium segregation or the distribution of silver itself. Microanalysis was performed using the technique of combined electron microscopy and electron energy analysis with a spatial resolution of < 100Å.     

Warm Deformation of Alloy Al – 4.7% Mg – 0.32% Mn – 0.21% Sc – 0.09% Zr

Metal Science and Heat Treatment - The evolution of the structure and mechanical properties of sheets from alloy Al – 4.7% Mg – 0.32% Mn – 0.21% Sc – 0.09% Zr during warm...     

Nature of High-Temperature Strength of Deformed Magnesium Alloy of the Mg – Zn – Zr – REE System

Metal Science and Heat Treatment - Results of a study of the structure, phase composition, and main parameters of high-temperature strength of forgings from deformed magnesium alloy VMD16 of the Mg...     

Effect of Adding Lanthanum to Al – 5% Ti – 1% B Master Alloy on the Efficiency of Grain Refinement in Aluminum and Al – 7% Si Alloy

Metal Science and Heat Treatment - An Al – 5% Ti – 1% B master alloy with a lanthanum addition is prepared by improved technology employing halides. The effect of adding lanthanum to...