A forming method of mg-gd-y-zn-zr magnesium alloy bidirectional expansion equal channel extrusion billet

Abstract

The invention discloses a forming method of Mg-Gd-Y-Zn-Zr magnesium alloy bidirectional expansion equal channel extrusion blank forming and relates to a forming die of the Mg-Gd-Y-Zn-Zr magnesium alloy bidirectional expansion equal channel extrusion blank forming. The die comprises an upper die seat, a male die and a female die, wherein the female die is arranged below the male die, is of an inverted "T" shape and is formed by communicating a vertical cavity and a horizontal cavity with the same diameter; in addition, a spherical cabin is formed in the intersection part of the vertical cavityand the horizontal cavity, small circular beads are respectively arranged in the joint of the spherical cabin and the vertical cavity and the joint of the spherical cabin and the horizontal cavity, and the vertical cavity is used for accessing the male die. A bidirectional equal channel extrusion structure formed by the vertical cavity and the horizontal cavity is adopted, the spherical cabin is arranged in the channel joint and a multi-pass deformation test is carried out, the compound superposition of the shear deformation in a cavity corner and the heading extrusion deformation in the spherical cabin during a material extrusion process is realized, accumulated plastic deformation process of a material is reached, refinement of a microstructure of a Mg-Gd-Y-Zn-Zr magnesium alloy blank isfinally realized, and the mechanical property of an alloy is promoted.

Description

technical field [0001] The invention belongs to the technical field of plastic processing and forming of metal materials, and in particular relates to a forming method of Mg-Gd-Y-Zn-Zr magnesium alloy bidirectional expansion equal channel extrusion billet making. Background technique [0002] With the continuous consumption of natural energy and the situation of near-exhaustion, the development of lightweight equipment has become an inevitable guide. As the lightest metal, magnesium has a density of 1.74g / cm3, which is only two-thirds of that of aluminum. A quarter of titanium, a third of titanium. At the same time, magnesium alloy has high specific strength, specific stiffness, corrosion resistance and electromagnetic shielding properties, making it an important choice for aerospace and electronic materials. In the Mg-Gd-Y-Zn-Zr alloy, because of the existence of the LPSO (Long Period Stacking Ordered) structure, the alloy has higher performance than the traditional magnes...

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Problems solved by technology

Plastic deformation is a common method for alloys to improve material properties. Traditional plastic deformation billet making methods, such as pier rough drawing and long billet making method, are simple, convenient and easy to operate, but have the disadvantage of small strain, and it is difficult to achieve ultra-fine materials; large Plastic deformation (Severe Plastic Deformation, SPD) achieves microstructure grain refinement by introducing a large amount of strain, breaking up large massive LPSO phases, making the microstructure composition more dense and uniform, and achieving a two-way improvement in material strength and plasticity

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