Non-heat treatment strengthened high-strength high-toughness pressure casting aluminum-magnesium-silicon alloy and preparing method thereof

Abstract

The invention relates to a non-heat-treatment strengthened high-strength high-toughness pressure casting aluminum-magnesium-silicon alloy, and a preparing method thereof. The pressure casting aluminum-magnesium-silicon alloy comprises, by weight percent, 6.0 to 8.0% of Mg, 2.0 to 3.6% of Si, 0.6 to 0.9% of Mn, 0.15 to 0.20% of Ti, 0.004 to 0.006% of Be, 0.003 to 0.01% of Ca, 0.03 to 0.1% of V, 0.02 to 0.1% of Zr, 0.01 to 0.2% of RE, smaller than or equal to 0.4% of the sum of the total amount of other impurities and the balance Al. the alloy has the high strength and high toughness under the casting-state condition, good pressure casting can be achieved, and the application needs of large thin-wall car body structural parts of the car industry can be greatly met.

Description

technical field

[0001] The invention relates to the technical field of metal materials, in particular to a non-heat treatment strengthened high-strength and high-toughness die-casting aluminum-magnesium-silicon alloy and a preparation method thereof. Background technique

[0002] In recent years, with the rapid development of industries such as automobiles and aerospace, the performance requirements for materials used in automobiles and aerospace have become more stringent. In addition, due to social pressures such as energy saving, emission reduction, and environmental pollution, lightweight has become a strategic development requirement. Therefore, the automobile, aerospace and other industries require higher strength when designing parts, and require high elongation and excellent impact toughness during deformation in order to achieve the goal of lightweight. Most die-casting aluminum alloys have medium strength and poor toughness (elongation <5%), such as traditional...

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