High strength and high toughness aluminum die-cast alloy and preparation method thereof

Abstract

The invention relates to the technical field of metal and metal processing and discloses a high strength and high toughness aluminum die-cast alloy. The alloy comprises the following elements in percent by mass: 0.1-10wt% of magnesium (Mg), 0.1-3wt% of ferrum (Fe), 5-30ppm of beryllium (Be), three to five trace elements selected from silicon (Si), manganese (Mn), zinc (Zn), vanadium (V), nickel (Ni), chromium (Cr), zirconium (Zr), titanium (Ti), yttrium (Y), gadolinium (Gd), molybdenum (Mo), lanthanum (La) and cerium (Ce), less than 0.3wt% of impurity elements and the balance of aluminum, wherein the content of each trace element is 0.1-1.0wt%. According to the aluminum die-cast alloy, the yield strength and the ductility of a die casting as cast condition can be improved obviously, so that the prepared aluminum alloy can be used directly as cast condition without being thermally treated. The aluminum die-cast alloy can provide high toughness and proper strength so as to meet a designdemand on a high quality casting product, and therefore, the aluminum die-cast alloy is suitable for manufacturing high strength and high toughness thin-walled parts needed in automobile and other industries.

Description

technical field [0001] The invention relates to the technical field of metal and metal processing, in particular to a high-strength and high-toughness die-casting aluminum alloy and a preparation method thereof, in particular to a die-casting aluminum alloy capable of providing high strength and high toughness in the as-cast state and a manufacturing method thereof . Background technique [0002] Die casting is one of the important methods for the production of aluminum alloy castings. It is suitable for the production of castings with thin walls, complex shapes, and clear outlines. The castings have dense structures, good mechanical properties, high production efficiency, and low mass production costs. 65% of aluminum alloy castings for vehicles are die castings. The quality of die castings is mainly determined by many factors such as alloy composition, melt quality, mold structure design and optimization of die casting parameters. To improve the consistency, repeatabilit...

AI Technical Summary

Problems solved by technology

Therefore, the main problem of the two types of alloys of the current aluminum-silicon-manganese and aluminum-magnesium-silicon systems is that the strength and toughness cannot meet the design requirements of high-quality casting products, and both need to be further improved.

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