Method for preparing semi-solid slurry or billet of near-eutectic aluminum-silicon alloy

Abstract

The invention provides a preparation method for near-eutectic aluminium-silicon alloy semisolid slurry or blanks. The method comprises the steps of Step 1, preheating alloy aluminium-silicon ingots, adding into a crucible resistance furnace, after the alloy aluminium-silicon ingots are molten, stirring for degassing, refining, performing first standing, cooling, skimming, performing second standing, thus obtaining an alloy liquid; Step 2, preheating a mechanical roller coated with a casting coating inside; Step 3, inclining the mechanical roller relative to the horizontal ground, injecting the alloy liquid into the mechanical roller through a quantitative pouring system, transferring the alloy liquid into a tundish with a temperature control system, standing, and performing high-pressure extrusion casting to obtain the near-eutectic aluminium-silicon alloy semisolid slurry; Step 4, pouring the near-eutectic aluminium-silicon alloy semisolid slurry into metal molds directly, and solidifying, so that the near-eutectic aluminium-silicon alloy semisolid blanks can be obtained. According to the method, the slurry producing efficiency is high, high-performance castings can be prepared, and the method is high in market promotion value.

Description

technical field [0001] The invention belongs to the technical field of semi-solid metal preparation, in particular to a method for preparing a near-eutectic aluminum-silicon alloy semi-solid slurry or billet. Background technique [0002] In the early 1970s, Spencer et al. from the Massachusetts Institute of Technology in the United States found that when the metal material in the solidified state (the temperature range between the solidus line and the liquidus line) was vigorously stirred, the dendrites were broken. It is crushed to form a spherical grain structure, which has the excellent properties required for forming and is called semi-solid forming. The discovery opens up new frontiers in materials processing. Semi-solid forming technology utilizes the solid-liquid coexistence characteristics of metals when they transform between solid and liquid states, which reduces the processing temperature and deformation resistance of metals, thus providing a new approach for ne...

AI Technical Summary

Problems solved by technology

However, due to the narrow solidification range of these die-casting aluminum alloys near the binary eutectic point of aluminum and silicon, it is difficult to prepare semi-solid slurry or billet, and has not been paid attention to in the field of semi-solid technology research for a long time.

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