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18R long-period-phase ultrafine-reinforced high-toughness magnesium alloy and preparation method thereof

A long-term, ultra-refined technology, applied in the field of magnesium alloy processing, can solve problems such as kink deformation, and achieve the effect of improving plasticity and forming ability

Active Publication Date: 2019-06-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the 18R long-period phase has good plasticity, it can produce kink deformation during plastic processing, and it is difficult to obtain an effectively refined 18R long-period phase even if the severe plastic processing technology with a significant refinement effect is adopted.

Method used

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  • 18R long-period-phase ultrafine-reinforced high-toughness magnesium alloy and preparation method thereof
  • 18R long-period-phase ultrafine-reinforced high-toughness magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Cut the alloy extruded billet whose composition is Mg-5wt%Y-1.67wt%Zn, and the atomic ratio of Y:Zn is 2.2, and place it in a rotary die and equal channel corner extrusion die for 4 consecutive equal channel passes at 350°C The bulk material with a large number of kink bands in the 18R long-period phase was obtained by angular extrusion. Cut the alloy rod with a diameter of 5mm from the above bulk material along the extrusion direction, and carry out multi-pass hot drawing processing on the alloy rod. The drawing temperature is 320°C, the deformation in a single pass is 35%, and the drawing speed It is 10mm / s, and the strain is 4.2. After drawing, a high-strength and tough magnesium alloy based on ultra-fine strengthening of 18R long-period phase is obtained.

Embodiment 2

[0026] Cut the alloy extruded billet with the composition of Mg-6.84wt%Y-2.52wt%Zn, and the atomic ratio of Y:Zn is 2, and put it in the rotary die and other channel corner extrusion dies for 6 consecutive passes at 350 °C, etc. The bulk material with a large number of kink bands in the 18R long-period phase was obtained by channel corner extrusion. Cut alloy rods with a diameter of 15 mm from the above bulk material along the extrusion direction, and perform multi-pass hot drawing processing on the alloy rods. The drawing temperature is 340 °C, the deformation in a single pass is 20%, and the drawing speed is It is 6mm / s, and the strain is 7.8. After drawing, a high-strength and tough magnesium alloy based on ultra-fine strengthening of 18R long-period phase is obtained.

Embodiment 3

[0028] Cut the alloy extruded billet with the composition of Mg-6.84wt%Y-2.52wt%Zn, and the atomic ratio of Y:Zn is 2, and put it in the rotary die and other channel corner extrusion dies for 6 consecutive passes at 350 °C, etc. The bulk material with a large number of kink bands in the 18R long-period phase was obtained by channel corner extrusion. Cut alloy rods with a diameter of 15 mm from the above bulk material along the extrusion direction, and perform multi-pass hot drawing processing on the alloy rods. The drawing temperature is 340 °C, the deformation in a single pass is 20%, and the drawing speed is It is 6mm / s, and the strain is 5.4. After drawing, a high-strength and toughness magnesium alloy based on ultrafine strengthening of 18R long-period phase is obtained.

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Abstract

the invention discloses a high-toughness magnesium alloy based on 18R long-period phase ultrafine enhancement and a preparation method thereof. The high-toughness magnesium alloy the preparation method comprises the following steps of A, mixing Mg-Y-Zn alloy extruded blank is cut, then is subjected to continuous equal-channel corner extrusion processing to obtain a bulk material with a large number of twisted strips in the 18R long-period phase; B, cutting an alloy rod with the diameter of 5mm to 15 mm from the block material, wherein the length direction of the alloy rod is parallel to the extrusion direction of the equal-channel corner; and carrying out multi-pass hot-drawing processing on the alloy rod to obtain the high-toughness magnesium alloy which is ultrafine in 18R long-period phase and uniformly dispersed. According to the method, the pre-twisting of the 18R long-period phase is realized by means of equal-channel corner extrusion, the long-period phase is broken and refinedfrom the twisted strip by utilizing the subsequent large-strain multi-pass hot drawing, so that the 18R long-period phase super-refined and uniform distribution is obtained, and the strength and the plasticity of the alloy are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, and relates to a high-strength and tough magnesium alloy based on 18R long-period phase superfine reinforcement and a preparation method thereof, in particular to a 18R-based magnesium alloy prepared by equal-channel angular extrusion and subsequent hot drawing. A high-strength and toughness magnesium alloy reinforced by ultra-fine long-period phases and a preparation method thereof. Background technique [0002] Magnesium-rare-earth alloys reinforced with long-period stacking ordered structure phase (referred to as long-period phase) have high strength, high plasticity and good heat resistance, and are a new generation of high-performance magnesium alloy materials with the most application potential. The long-period phase-reinforced magnesium alloys that have been researched and developed mainly include three alloy systems: Mg-Y-Zn system, Mg-Gd-Zn system and Mg-Gd-Y-Zn syst...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22F1/06
Inventor 刘欢葛云云张俊王策黄河江静华马爱斌
Owner HOHAI UNIV