High strength and ductility high-damping wrought magnesium alloy and preparation thereof

A deformed magnesium alloy, high damping technology, applied in the field of magnesium-based materials and their preparation, to achieve the effects of strong portability, increased strength and plasticity, and high damping performance

Inactive Publication Date: 2008-06-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the contradictory problem between the damping performance and the mechanical performance of the existing magnesium alloy, the present invention proposes a high-strength, high-toughness, high-damping deformable magnesium alloy and its preparation method

Method used

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specific Embodiment approach 1

[0013] Embodiment 1: The high-strength, toughness, and high-damping deformable magnesium alloy of this embodiment is a Mg-Si-Cu alloy, and the weight percentages of each component are: silicon 0.5-5%, copper: 0.2-3%, Fe<0.003%, Ni<0.003%, other impurities<0.06%, and the balance is magnesium.

specific Embodiment approach 2

[0014] Specific embodiment two: This embodiment prepares Mg-Si-Cu magnesium alloy according to the following method:

[0015] (1) Place the industrial high-purity magnesium with a purity greater than 99.96% in a 0.5% NaOH aqueous solution for 0.5 hours, then dry it in a drying oven at 150°C; put the dry pure magnesium into an iron crucible and melt it, and the protective atmosphere is 10vol%SF 6 +90%CO 2 , the temperature is raised to 750-850° C., 0.5-5% of silicon and 0.2-3% of copper are added according to the weight percentage, and alloy elements are added, and silicon and copper are added in the form of industrially pure simple substances. After adding the alloying elements, stir the melt fully, let it stand for 20 minutes, remove the scum on the surface of the melt, lower the temperature to 640-680°C and cast it into an iron mold.

[0016] (2) Perform conventional hot extrusion on the smelted magnesium alloy ingot. The hot extrusion is carried out on a hydraulic press, ...

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 2 is that after hot extrusion of the magnesium alloy ingot, multi-directional forging (Multi-Directional Forging, MDF) is carried out, and the multi-directional forging temperature is 150-350 ℃, the strain rate is 1×10 -3 ~3×10 -2 S -1 . The three-axis (X, Y, Z) deformation sequence is X→Y→Z, the angle between X, Y and Z is 90° and meets the right-hand rule; the forging strain in each direction is 0.3-1.0, and the cumulative strain The variable is 7-10. Yield strength is 203MPa, tensile strength is 287MPa, elongation is 18%, Q -1 is 0.016.

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Abstract

The invention discloses a high-toughness high-damping magnesium alloy and the preparation method thereof and relates to magnesium-based material with high damping and good mechanical performance and the preparation method thereof. The invention solves the contradiction between the damping performance and the mechanical performance of the magnesium alloy; the proportion of the invention is: Si of 0.5 to 5 percent, Cu of 0.2 to 3 percent, Fe of less than 0.003 percent, Ni of less than 0.003 percent, other impurities of less than 0.06 percent, the remainder is magnesium. The preparation method is that: at first, high-pure magnesium is placed into NaOH aqueous solution, dried, then placed into a crucible for melting, is made a temperature rise to between 750 and 850 DEG C by adopting protective atmosphere, added with alloy elements according to the proportion, stirred and kept, then floating slags are fished out, the solution is made a temperature drop to between 640 and 680 DEG C to cast; the casting ingot is made a routine heat extrusion deformation, the temperature is controlled between 320 and 400 DEG C, the time of thermal insulation is 30 minutes, the extrusion speed is between 50 and 120mm / min, the extrusion ratio is 9-16:1, then the casting ingot is made a severe plastic deformation; finally the casting ingot is made a heat treatment, the temperature is controlled between 150 and 350 DEG C, the time of thermal insulation is between 0.5 and 10 hours. The invention successfully solves the contradiction between the strength and the damping performance of the magnesium alloy; the used equipment are all universal equipments, so the invention has strong implantability and low cost.

Description

[0001] This application is a divisional application filed on July 26, 2006, application number: 2006100103268, and invention name: high-strength, high-toughness, high-damping deformable magnesium alloy and its manufacturing method. technical field [0002] The invention relates to a magnesium-based material with high damping and excellent mechanical properties and a preparation method thereof. Background technique [0003] Among practical metal materials, magnesium and its alloys have the lowest density, and are known as ultra-lightweight materials in the 21st century. After the 1990s, with the development of magnesium smelting technology, the output of magnesium increased rapidly and the price dropped, especially the increasing demand for magnesium alloys in the fields of automobiles, electronics, communications, aerospace and national defense military industries, which brought A new round of magnesium research and application climax. In addition to its low density, magnes...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02B22D21/04C22F1/06
Inventor郑明毅乔晓光吴昆
OwnerHARBIN INST OF TECH