Dynamic yield and tensile strength of LY12 aluminum alloy at elevated temperatures

Abstract

Wave profile measurements are presented for LY12 aluminum alloy with a wide range of preheating from the room temperature to approaching the melting point, and the dependences of dynamic yield strength and tensile strength on the initial sample temperature have been investigated. Experimental results indicate that dynamic yield strength decreases rapidly with the heating temperature. Decrease of the spall strength with the increase of heating temperature for LY12 aluminum alloy was observed also, and nearly 80% loss of spall strength was determined in the present temperature range. An empirical formulation has been proposed to normalize the dependence of spall strength on the heating temperature, and it gives a fairly good fitting for a number of aluminum based materials, including pure aluminum, aluminum alloy and single crystal aluminum, measured by this work and by others in the literature.