Elevated temperature creep behavior of three rapidly solidified Al-Fe-Si materials containing Cr, Mn, or Mo

Research on the high temperature creep behavior of three rapidly solidified AI-Fe-X-Si (where X = Cr, Mn or Mo) dispersion strengthened materials with three different alloying compositions has been conducted. Firstly, microstructural examinations have been carried out on the as-received, thermally treated and tested samples. The microstructure consists of a fine Al matrix embedding small round-shaped Al-12(Fe,X)(3)Si and Al-13(Fe,X)(4) dispersoids. Grain sizes ranging from 0.85 to 1.45 mu m and dispersoid sizes ranging from 45 to 54 nm were observed. Secondly, tensile tests were performed at high temperature from 573 to 823 K at strain rates ranging from 2.5 x 10(-6) to 10(-2) s(-1). The experimental data exhibited high apparent stress exponent, n(ap), and high activation energy, Q(ap). The microstructure remained stable and fine after testing. The results are analyzed by means of various models used in the literature. (C) 1997 Elsevier Science S.A.