Nano-Crystalline Aluminum Alloys Based on Al-Fe, Al-Cu and Al-Sc Systems
Final rept. 2 Feb 2009-2 Mar 2010
NATIONAL INST FOR MATERIALS SCIENCE TSUKUBA IBARAKI (JAPAN)
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Bulk nano-crystalline Al-1Fe-0.5Zr alloys were fabricated via mechanical alloying and spark plasma sintering processing exhibited high compressive yield strength of 854MPa with a plastic strain of 19 at room temperature. Compressive yield strength of 455MPa was exhibited at 250 deg C. A high strength and plastic strain was exhibited by these alloys with substantially lower amount of solute used as compared with other alloys with similar strengths. The high strength and high plastic strains has been attributed to the presence of high density of nano-crystalline grains with grain size of 65nm and a small volume faction of coarse grains distributed through the microstructure. Control of mechanical alloying process and SPS condition can be utilized to tailor the mechanical properties of nano-crystalline Al alloys through control of the microstructure.
- Metallurgy and Metallography