Ultrahigh-plasticity rare earth wrought magnesium alloy and preparation method of extruded plate thereof

Abstract

The invention provides an ultrahigh-plasticity rare earth wrought magnesium alloy and a preparation method of an extruded plate of the ultrahigh-plasticity rare earth wrought magnesium alloy, and belongs to the technical field of magnesium alloy materials and molding.The ultrahigh-plasticity rare earth wrought magnesium alloy comprises, by mass, 0-4% of Gd, 0-4% of Er, 0.1-0.6% of Zr, the balance Mg and 1-4% of total rare earth, the ultrahigh-plasticity rare earth magnesium alloy is prepared by upsetting an ultrahigh-plasticity rare earth magnesium alloy material and carrying out asymmetric extrusion by using an extrusion die. The method has the two advantages that 1, in the aspect of the forming process, a die is used for upsetting, it is guaranteed that different areas of the extruded plate are fully deformed, grains are further refined, and non-uniform extrusion can greatly weaken the defect of a strong base surface texture of the extruded plate under a traditional deformation process; and 2, in the aspect of material design, the ultrahigh-plasticity magnesium alloy plate is obtained through the action of activating a non-crystal face slippage system by rare earth elements, and the percentage elongation after fracture of the plate is larger than or equal to 35%. The wrought magnesium alloy plate disclosed by the invention has the characteristics of ultrahigh plasticity and weak texture at room temperature, can be subjected to large-strain room-temperature forming and processing, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a super-high plasticity rare earth deformed magnesium alloy and a preparation method of an extruded plate thereof. Background technique [0002] As the lightest structural metal material, magnesium alloy has the advantages of high specific strength, high specific stiffness, excellent shock and noise reduction performance, good electromagnetic shielding performance, excellent machining performance, and easy recycling. It can replace traditional steel and aluminum alloys. , has broad application prospects in the fields of aviation, aerospace, automobiles and electronics. However, the magnesium alloy crystal has a close-packed hexagonal structure, and there are few slip systems. The critical shear stress of the cylindrical and conical slip is much larger than that of the basal slip during plastic forming at room temperature. At room temperature, c or <c+ a>...

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Problems solved by technology

[0004] The purpose of the invention is to solve the problems of low room temperature plasticity and difficult forming of magnesium alloy sheets at present, and to provide a preparation method of ultrahigh plasticity rare earth deformed magnesium alloys and extruded sheets thereof. The material has ultrahigh plasticity and low texture strength, and is easy to process The process is simple and suitable for industrial production, and has high application prospects for non-load-bearing structural parts with lightweight requirements

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