High-toughness die-casting aluminum alloy for new energy automobile and preparation method of high-toughness die-casting aluminum alloy

Abstract

The invention relates to a high-strength and high-toughness die-casting aluminum alloy for a new energy automobile and a preparation method of the high-strength and high-toughness die-casting aluminum alloy. The alloy comprises the following elements in percentage by weight: 8wt%-10wt% of Si; fe: 0.05 to 0.5 wt%; mn < lt >; 1.0 wt%; mg: 0.1 to 0.5 wt%; cu: 0.1 to 1.0 wt%; zn < lt >; 1.0 wt%; ti: 0.05 to 0.2 wt%; sr: 0.005 wt% to 0.05 wt%; la + Cult; 0.5 wt%; molt; 0.1 wt%; sclt; Sclt; 0.05 wt% of an additive; the sum of the weight percentages of the other impurities is controlled to be 0.5 wt% or below. Compared with the prior art, the Al-Ti-C-B intermediate alloy amorphous powder, the Al-20La + Ce intermediate alloy amorphous powder, the Al-20Mo intermediate alloy amorphous powder and the Al-3Sc intermediate alloy amorphous powder are prepared by adopting a melt-spinning method in combination with high-energy ball milling, Al-Ti-C-B, Al-Mo and Al-Sc are added as refiners and modifiers, and the ductility of the material is remarkably improved; and through heat treatment at 200 DEG C for 4 hours, the tensile strength is larger than 300 MPa, the yield strength is larger than 120 MPa, and the ductility is 15-20%.

Description

technical field [0001] The invention relates to an aluminum alloy, in particular to a high-strength and tough die-casting aluminum alloy for new energy vehicles and a preparation method thereof. Background technique [0002] In recent years, with the continuous and rapid development of the automobile industry, the development and application of automobile lightweight has received more and more widespread attention. The density of aluminum alloy is only one-third of that of steel, which is the preferred material for automobile lightweight. Studies have shown that replacing low-carbon steel, cast iron or high-strength steel with aluminum alloy can achieve a weight reduction effect of 30% to 60%, and the use of aluminum alloy per kilogram can reduce greenhouse gas emissions by 13-20kg. Substituting aluminum for steel is a development trend of automobile lightweight technology. [0003] New energy vehicles are different from traditional vehicles in that they use batteries as po...

AI Technical Summary

Problems solved by technology

The material requires an auxiliary vacuum die-casting process to achieve its performance with an elongation rate greater than 14%, while when using non-vacuum, its elongation rate is reduced from 14.6% to 7.6%, the performance is significantly reduced, and the performance requirement of high elongation rate cannot be achieved

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