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Pretreatment method for improving mechanical property of wrought magnesium alloy

A wrought magnesium alloy and pretreatment technology, which is applied in the field of heat treatment to improve the mechanical properties of wrought magnesium alloys, can solve the problems of difficulty in realizing large-scale industrial production, poor safety, and complicated processes, and avoid inversion of strength and toughness. Effects of transportation and safe handling methods

Active Publication Date: 2018-01-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problems that it is difficult to improve the strength and toughness at the same time by adopting the general heat treatment process in the processing process of the existing magnesium alloy, and the process is complex, the cycle is long, the cost is too high, the safety is poor, so that it is difficult to realize mass industrial production, etc., and provides An economical, environmentally friendly, simple and safe treatment method for magnesium alloys

Method used

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  • Pretreatment method for improving mechanical property of wrought magnesium alloy
  • Pretreatment method for improving mechanical property of wrought magnesium alloy
  • Pretreatment method for improving mechanical property of wrought magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Select an ingot with a composition of Mg-10Gd (wt.%), and homogenize it, that is, place the ingot in a box-type heat treatment furnace, raise the temperature to 400°C with the furnace, keep it warm for 12h, and then place it in warm water at 35°C Quenching. Then preheat the homogenized ingot to 250°C, and extrude it into a rod with a diameter of 10mm at an extrusion speed of 0.1mm / s and an extrusion ratio of 25:1. The bar is processed into a tensile test bar, and then the above-mentioned tensile test bar is subjected to tensile pre-deformation treatment on a tensile testing machine, and the deformation amount is 2% (the deformation amount is length), and then unloaded. Finally, immerse the test bar directly in liquid nitrogen (-196°C) for cryogenic treatment for 1 hour. After the cryogenic treatment, take out the tensile test bar and place it in the air to return to room temperature naturally. Carry out tensile test (using GB / T 228.1-2010 metal material tensile test pa...

Embodiment 2

[0029] Select an ingot with a composition of Mg-10Gd (wt.%), and homogenize it, that is, place the ingot in a box-type heat treatment furnace, raise the temperature to 400°C with the furnace, keep it warm for 12h, and then place it in warm water at 35°C Quenching. Then preheat the homogenized ingot to 250°C, and extrude it into a rod with a diameter of 10mm at an extrusion speed of 0.1mm / s and an extrusion ratio of 25:1. The bar is processed into a tensile test bar, and then the above-mentioned tensile test bar is subjected to tensile pre-deformation treatment on a tensile testing machine, with a deformation amount of 2%, and then unloaded. Immerse the test bar directly in liquid nitrogen (-196°C) for cryogenic treatment for 1 hour. After the cryogenic treatment, take out the tensile test bar and place it in the air to return to room temperature naturally. Repeat again: the tensile pre-deformation treatment of the tensile test bar on the tensile testing machine—the deformatio...

Embodiment 3

[0031]Select an ingot with a composition of Mg-10Gd (wt.%), and homogenize it, that is, place the ingot in a box-type heat treatment furnace, raise the temperature to 400°C with the furnace, keep it warm for 12h, and then place it in warm water at 35°C Quenching. Then preheat the homogenized ingot to 250°C, and extrude it into a rod with a diameter of 10mm at an extrusion speed of 0.1mm / s and an extrusion ratio of 25:1. The bar is processed into a tensile test bar, and then the above-mentioned tensile test bar is subjected to tensile pre-deformation treatment on a tensile testing machine, with a deformation amount of 2%, and then unloaded. Immerse the test bar directly in liquid nitrogen (-196°C) for cryogenic treatment for 1 hour. After the cryogenic treatment, take out the tensile test bar and place it in the air to return to room temperature naturally. Then repeat the submersion of the test rod in liquid nitrogen (-196°C) for 1h cryogenic treatment twice. Perform a tensil...

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Abstract

The invention discloses a pretreatment method for improving the mechanical property of wrought magnesium alloy. The pretreatment method comprises the following steps of (1) homogenization treatment and compression deformation; (2) predeformation treatment, wherein bars are machined into tensile test bars, and then the tensile test bars are placed into a tensile testing machine to be subjected to predeformation treatment (stretching or compression), and the amount of deformation ranges from 0.5% to 20%; and (3) subzero treatment, wherein the magnesium alloy tensile test bars subjected to predeformation treatment in the step (2) are placed into a liquid nitrogen environment to be subjected to subzero treatment for 0.5 hour to 24 hours, and the tensile test bars are taken out and placed intoair to naturally recover to the room temperature. With the pretreatment method for improving the mechanical property of wrought magnesium alloy, the purposes of improving the strength and the flexibility of magnesium alloy can be achieved at the same time, and the current situation that the relationship between strength and flexibility is inverted after common annealing treatment or T5 and T6 aging thermal treatment is relieved.

Description

technical field [0001] The invention relates to a heat treatment method for improving the mechanical properties of a deformed magnesium alloy, in particular to a treatment method for improving the strength and toughness of the magnesium alloy by cryogenic treatment. Background technique [0002] Magnesium alloy is currently the smallest density among all structural metals and alloy materials. It has a series of advantages such as high specific strength and specific stiffness, good shock absorption, strong electromagnetic shielding and radiation resistance, easy cutting and processing, and easy recycling. , electronics, electrical appliances, transportation, aerospace and national defense and other industrial fields have extremely important application value and broad development prospects. With the depletion of metal mineral resources such as iron and aluminum, especially in the environment where energy and environmental protection issues are becoming more and more prominent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 余晖李丽超李其智范少达孟帅举薛海涛
Owner HEBEI UNIV OF TECH
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