Abstract

Low temperature electrical resistivity was used to determine the material variability (a) between different manufacturers, (b) between different heats from the same manufacturer, and (c) within a given heat for A1 2024, Al-5% Mg alloys, Inconel 718, A286 stainless, and AISI 316. Generally, the coefficient of variation for solution annealed alloys ranged from 1.2 to 14% between manufacturers, 0.8 to 5.1 % between heats, and 0.1 to 1.6% within a heat with stainless steels at the low ends and AI 2024 at the high ends. The variability is increased if the material is in a precipitation-hardened condition. A statistical analysis suggests that the variability within a heat is non-normal. It is also shown that precipitation increases the intrinsic resistivity.

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