METHOD FOR MANUFACTURING CARBON-CONTAINING HIGH STRENGTH DISTRIBUTION-REINFORATED ALUMINUM AND COPPER ALLOY USING MULTI-SIZE METAL GRANULES BY MECHANIZABLE COATING

摘要

Mechanical adaptation Although the gold-plating process is capable of producing high-temperature alloys with excellent properties, economical efficiency and complexity of operation have been problematic. Typical difficulties are that the process takes a long time, the powder is severely pressed against the ball surface or the inner wall of the container, and the chemical reactivity is strong due to severe milling, which requires attention to the handling of the fine powder. In general, the mechanical alloying process is classified into the initial stage of grain coarsening, the middle stage of grain breakage, and the steady-state stage of final fine powder formation. Until now, all of the alloys manufactured by mechanical alloying have been finely milled to the final stage . However, in the present invention, the coarse metal granules having a size of 0.5 to 2 mm produced in the initial milling step are used in place of the stereotypes. This is possible because the fine carbon powder serves as a lubricant and maximizes the milling efficiency. In addition, since the oxide on the surface of the metal powder is naturally crushed and dispersed through ball milling, sufficient dispersion strengthening effect can be obtained even in the initial milling step. The composition of the alloy is: 96% Al + 4% C, 87-97% Al + 2-12% Mg + 1% C, 92% Cu + 5% Al + 3% Composition excluded). By using the granular powder produced in the early stage of milling, the ball milling time can be shortened by about 1/4. In addition, there is no phenomenon that the soft metal powder is adsorbed on the ball surface or the inner wall of the container without adding any additive, and the powder recovery rate is high, which can simplify the process. The prepared granulated powders are subjected to degassing treatment at relatively high temperature after the canning to solve the work hardening during milling, and when subjected to high temperature molding such as extrusion, the alloy having superior mechanical properties, especially high temperature properties, compared with existing alloys of the same kind can be obtained .