Plastic deformation method for cast magnesium-gadolinium-yttrium-neodymium-zirconium (Mg-Gd-Y-Nd-Zr) rare earth magnesium-alloy component

Abstract

The invention discloses a plastic deformation method for a cast magnesium-gadolinium-yttrium-neodymium-zirconium (Mg-Gd-Y-Nd-Zr) rare earth magnesium-alloy component. The plastic deformation method comprises the following steps: (1) homogenizing treatment on a cast structure; (2) multiple-directional forging and gradient-temperature repeated pre-deformation; (3) die-forging hot forming; (4) die-forging cold reforming; (5) artificial aging heat treatment; and (6) artificial aging cold treatment. After grains are refined by multiple-directional forging and gradient-temperature repeated pre-deformation, the performance is greatly improved; hot die forging and cold die forging are combined for forming, so that all parts of the component are approximate in structure and performance and the anisotropic defect of the component, caused by use of an extrusion technology, is avoided; a high-strength heat-resistant Mg-Gd-Y-Nd-Zr magnesium-alloy component can be produced by small-sized equipment, and energy is saved; and the problems of oversize grains and low forming performance of the cast Mg-Gd-Y-Nd-Zr rare earth magnesium-alloy component are solved, the coordination and integration of forming and strengthening and toughening of the Mg-Gd-Y-Nd-Zr magnesium-alloy are realized, and the product performance is improved.

Description

technical field [0001] The invention relates to a plastic deformation method of a rare earth magnesium alloy component, in particular to a plastic deformation method of a cast Mg-Gd-Y-Nd-Zr (magnesium-gadolinium-yttrium-neodymium-zirconium) rare earth magnesium alloy component. Background technique [0002] Magnesium alloy is currently the lightest metal structural material available in industry, with the characteristics of low density, high specific strength, high specific stiffness, stable size, good electromagnetic shielding, good cutting performance, filling fluidity, etc. advantage. However, general magnesium alloys have low high-temperature strength and poor heat resistance. When the temperature rises, especially at 573-723K, the strength and creep resistance of magnesium alloys will drop significantly, making it difficult to be used as a key component material in aerospace and aviation. It has been applied in fields that have urgent requirements for energy saving and...

AI Technical Summary

Problems solved by technology

However, due to the addition of a large amount of expensive rare earth elements such as Gd and Y, the use cost is relatively high. If its mechanical properties are further improved, the unit use cost can be reduced, and the alloy will be further popularized and applied.

For this series of alloys, hot deformation processing is generally required. Compared with ordinary magnesium alloys, heat-resistant, high-strength rare earth magnesium alloys have greater difficulties in deformation, and cracks are easily generated during extrusion.

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