Deformation behavior of MoSi2 has been studied by micropillar compressions of single crystalline specimens prepared by focused ion beam (FIB) technique as a function of crystal orientation at room temperature. Activation of the {011}<100> and {01$\overline 3$}<331> slip systems were observed in the micropillars compressed along [$\overline 1$10] and [0 15 1], respectively. The CRSS values for each slip system exhibit an approximate power law relationship with the edge length of micropillar. The {01$\overline 3$}<331> slip exhibit much stronger size-dependence than the {011}<100> slip system.
ABSTRACTWe have examined tensile properties of a novel heat-resistant aluminium (Al)-based alloy (with a composition of Al-5Mg-3.5Zn (at%)) strengthened by the T-Al6Mg11Zn11 (cubic) intermetallic phase at various temperatures. The tested specimens of the present alloy were solution-treated at 450°C for 24 h and subsequently aged at 200 or 300 oC for 1 h. The granular precipitates of the T phase were dispersed rather homogenously in the grain interior in the specimen aged at 300°C. In the specimen aged at 200°C, numerous fine precipitates with a mean size of ∼20 nm were observed in the α-Al matrix. The specimen pre-aged at 200°C for 1 h exhibited a superior strength to the conventional Al alloys at elevated temperatures ranging from 150 to 200°C (corresponding to service temperatures for compressor impellers in turbochargers).
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