Tensile Properties of Internally Hydrided and T6-Treated Mg-10%Y-2%Nd Alloys at Elevated Temperatures

Abstract

Chill-cast Mg–10%Y–2%Nd alloy was internally hydrided and examined for tensile properties up to 773 K by short-time tensile and creep tests at strain-rates of 1.4×10⁻⁹ to 2.78×10⁻⁴ s⁻¹, in comparison with those of the T6-treated alloy. The results obtained were analyzed for the relationship of stress, σ (0.2% yield stress or applied creep stress), vs. strain rate, \\dotε (initial strain rate or minimum creep rate). Generally, the stress exponent, n (=dlog\\dotε⁄dlogσ)-value of the hydrided alloy is larger than that of the T6-treated alloy at the same test temperature. Consequently, the strength of the hydrided alloy becomes higher than that of the T6-treated alloy at strain rates lower than 10⁻⁵ s⁻¹ at and above 723 K . This fact can be attributed to the stable hydride precipitates in the internally hydrided alloy.