Aluminum-based composite material and preparation method thereof
An aluminum-based composite material and bar technology, applied in the field of powder metallurgy, can solve the problems of grain boundary or phase interface nucleation and growth, and achieve the effects of improving density, accelerating grain refinement, and reducing stress concentration.
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[0030]Example 1
[0031]Weigh 1.8g (3vol.%) of SiC powder, 48.2g of Al-Zn-Mg-Cu aluminum alloy powder and 450g of steel balls into the ball milling tank, the mass ratio of the balls is 9:1, and then add 0.5g Stearic acid, vacuum-dried at 60°C for 2h, sealed with inert gas.
[0032]Mix the powder at 200 rpm for 2 hours, and then high-energy ball milling at 500 rpm for 24 hours, and stop for 30 minutes every 3 hours during the high-energy ball milling process. The powder was then spark plasma sintered at 500° C. and 50 MPa pressure for 5 min. The sintered block is subjected to simple grinding and polishing to remove the graphite and oxide layer on the surface. Heat the processed block sample, and then move the heated block sample into a preheated extrusion die, hold it at 500°C for 5 minutes, and then extrude it at a pressure of 800-1000 MPa.
[0033]Finally, the prepared nanocomposite material was heat-treated. The sample wrapped in aluminum foil was solid-solved at 490°C for 2 hours, then qu...
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