Low-cost preparation method of ultrafine-grained high-strength plastic rare earth magnesium alloy

Abstract

The invention discloses a low-cost preparation method of an ultrafine-grained high-strength plastic rare earth magnesium alloy. The low-cost preparation method comprises the steps of alloy smelting, solution treatment and isothermal extrusion, specifically, firstly a ZK60 magnesium alloy containing a rare earth element ytterbium (Yb) with a mass percentage of 0.8-1.5% is smelted according to the composition, then rapidly condensed into an ingot and then subjected to the solution treatment at 400 DEG C for 48 h, and finally the isothermal extrusion is performed at 330-350 DEG C with a strain rate of 0.1-1.0 s<-1> and an extrusion ratio of 10-30 to obtain an ultrafine-grained high-strength plastic magnesium alloy block with an average grain size of less than 1 [mu]m, the tensile strength ofmore than 400 MPa and the elongation of more than 15%. According to the low-cost preparation method of the ultrafine-grained high-strength plastic rare earth magnesium alloy, conventional low extrusion ratio deformation is utilized to obtain an ultrafine-grained structure which is difficult to obtain in a conventional magnesium alloy system, the addition amount of the rare earth element is combined to control the strength and plasticity of the alloy, and finally a magnesium alloy block material which is refined in structure and has high strength and plasticity is obtained. The cost is low, theprocess is short, the efficiency is high, and good industrial application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of processing magnesium alloys, in particular to a simple processing method for producing ultra-fine-grained high-strength plastic rare-earth magnesium alloys, in particular to a low-cost preparation method for ultra-fine-grained high-strength plastic rare-earth magnesium alloys. Background technique [0002] Because magnesium alloy has the advantages of low density, specific stiffness, high specific strength, good damping performance, shock absorption performance, electromagnetic shielding performance and recyclability, magnesium alloy is widely used in automobiles, aerospace, weapons and other fields. However, the disadvantages of magnesium alloys such as low strength, poor corrosion resistance, and poor plasticity at room temperature also seriously restrict the development and application of magnesium alloys. [0003] Since the lattice structure of the matrix element magnesium is a close-packed hexagonal ...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the disadvantages of the production technology of ultra-fine-grained magnesium alloy in the above-mentioned background technology, and provide an ultra-fine-grained superplastic rare-earth magnesium alloy with small deformation, low damage, low cost and short production cycle Preparation

Images