Temperature distortion resistant magnesium alloy containing Ca and Sr

Abstract

The invention provides an advanced heat-resisting deformation magnesium alloy comprising the following components by weight: Al of 6.0%-9.0%, Ca of 0.5%-3.0%, Sr of 0.05%-0.5%, Mn of 0.1%-0.8%, Mg and ineluctable foreign matters of the rest.The cost of the alloy which does not contain rare-earth elements is low. The formability range of the alloy is extended because the added elements can thin the alloy tissue substantially; and the distribution of heat-resisting phases is turned from bulky bocks or bones to fine and scattered state, which improves the formability of the alloy. The alloy which has a good plastic property and forming ability and has a large deformation temperature range is suitable for common processes of extrusion pressing, drawing, rolling and smithing and can bear bigger deflection and higher deformation velocity at one time. The alloy that can be used as the light high-strength heat-resistant structural metallic material will be widely used for high-temperature transportation piping and high-temperature load-carrying construction of aerospace, automobiles, track trains and the like.

Description

Technical field [0001] The invention relates to a wrought magnesium alloy, in particular to a heat-resistant wrought magnesium alloy containing Ca and Sr. It belongs to the technical field of metal structural materials. Background technique [0002] As the lightest commercial metal structural material, magnesium alloy has high specific strength, specific rigidity, excellent damping performance, and various characteristics such as antimagnetic, shielding, and heat dissipation. It is used in aerospace, automotive, 3C (computer, communication, consumer Electronics) and other fields have been widely used. Take the application of magnesium alloy in automobiles, motorcycles, and rail trains as an example. It can not only significantly reduce weight, improve vehicle dynamic performance and reduce energy consumption, but also limit the improvement of vehicle structure and absorb vibration and noise. However, the current use of magnesium is far from giving full play to the potential advan...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to propose a heat-resistant deformed magnesium alloy containing Ca and Sr, which can effectively refine the alloy structure by compounding a certain amount of Ca and Sr, aiming at the shortcomings of the existing deformed magnesium alloys. Combined with Al to form Al with high melting point 2 Ca and Al 4 Sr refractory phase, reducing low melting point β-Mg 17 al 12 The number of phases, at the same time, Sr is also on Al 2 The Ca heat-resistant phase is modified and repaired, so that it can be distributed in the alloy grain boundary from a coarse block or bone to a fine dispersed state, thereby improving the formability, strength and heat resistance of magnesium alloys.

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