Improved strengthening in supersaturated Al-Sc-Zr alloy via melt-spinning and extrusion
Department of Materials Science and Engineering
A supersaturated ternary alloy with concentration of Al-0.5Sc-0.4Zr at. % was produced utilizing melt-spinning. The melt-spun ribbon was consolidated and extruded into a rod. A two-step heat treatment was designed to age supersaturated alloys to peak hardness. The melt-spun ribbon and extruded rod were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), microhardness and tensile strength measurements. The ambient microhardness of two-step aged melt-spun ribbon and extruded rod were 1120 MPa and 1180 MPa respectively. The yield and ultimate tensile strength of extruded rod were 300 and 315 MPa with 5.3% elongation. Larger precipitation volume fractions were found in two-step aged extruded rod than in melt-spun ribbon within shorter second-step aging. Strength levels in the melt-spun ribbon and extruded rod agree with order and Orowan strengthening predictions when using TEM measured precipitate radius and volume fractions.
Journal of Alloys and Compounds
Licavoli, J. J.,
Sanders, P. G.
Improved strengthening in supersaturated Al-Sc-Zr alloy via melt-spinning and extrusion.
Journal of Alloys and Compounds,
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