Heat treatment method for Mg-Al-Zn-Y rare-earth magnesium alloy

A heat treatment method and rare earth magnesium technology, applied in the field of magnesium alloy processing, can solve the problems of residual stress of deformed materials, poor formability, and reduction of workpiece formability by extrusion ratio, so as to improve mechanical properties, high temperature strength and creep resistance. Effect

Active Publication Date: 2014-11-19
重庆山渝道科技有限公司
View PDF8 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Selecting the appropriate extrusion temperature and extrusion ratio has an important impact on the formability of the workpiece. The extrusion temperature must be lower than the recrystallization temperature of the alloy. However, if the extrusion temperature is too low, it will affect the next step because it cannot be completely deformed, resulting in poor formability. The effect of the process; the extrusion ratio is determined according to the plastic deformation ability of the alloy. If the extrus...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heat treatment method for Mg-Al-Zn-Y rare-earth magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The Mg-Al-Zn-Y rare earth magnesium alloy ingot is hot-extruded, the extrusion temperature is 335°C, and the extrusion ratio is 5:1; the extruded Mg-Al-Zn-Y rare earth magnesium alloy is kept at 402°C for 5h , and then air-cooled to room temperature; then it was kept at 180°C for 18h, and finally air-cooled. After the above heat treatment, the tensile strength of the extruded Mg-Al-Zn-Y rare earth magnesium alloy is 376.09MPa, the elongation is 11.6%, and the hardness is 98.86HV.

Embodiment 2

[0018] The Mg-Al-Zn-Y rare earth magnesium alloy ingot is hot-extruded, the extrusion temperature is 340°C, and the extrusion ratio is 5:1; the extruded Mg-Al-Zn-Y rare earth magnesium alloy is kept at 405°C for 6h , and then air-cooled to room temperature; then it was kept at 190°C for 19h, and finally air-cooled. After the above heat treatment, the tensile strength of the extruded Mg-Al-Zn-Y rare earth magnesium alloy is 386.67MPa, the elongation is 12.8%, and the hardness is 106.48HV.

Embodiment 3

[0020] The Mg-Al-Zn-Y rare earth magnesium alloy ingot is hot-extruded, the extrusion temperature is 345°C, and the extrusion ratio is 6:1; the extruded Mg-Al-Zn-Y rare earth magnesium alloy is kept at 408°C for 7h , and then air-cooled to room temperature; then it was kept at 190°C for 18h, and finally air-cooled. After the above heat treatment, the tensile strength of the extruded Mg-Al-Zn-Y rare earth magnesium alloy is 380.26MPa, the elongation is 12.3%, and the hardness is 102.39HV.

[0021] Samples were taken from the workpiece in Example 2, and the microstructure of the alloy was observed under an optical microscope after grinding, polishing, and corrosion, as shown in the accompanying drawings. It can be seen from the attached drawings that after the above heat treatment, the morphology and distribution of the β phase in the alloy are significantly improved, and there are diffuse distributions in the grain and grain boundaries, and the precipitated phases are more unif...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a heat treatment method for an Mg-Al-Zn-Y rare-earth magnesium alloy. The method comprises the following steps: performing hot extrusion on a rare-earth magnesium alloy ingot, wherein the extrusion temperature is 340+/-5 DEG C, the extrusion ratio is 5-7, and performing air cooling to room temperature after extrusion; and performing heat treatment on the extruded deformation material, namely preserving the temperature to 402-408 DEG C for 5-7 hours, and performing air cooling to room temperature; and preserving the temperature to 180-190 DEG C, and finally performing air cooling. The Mg-Al-Zn-Y rare-earth magnesium alloy comprises the following elements in percentage by weight: 8.3-9.7 percent of Al, 0.37-1.0 percent of Zn, 1.85-1.95 percent of rare earth element Y and the balance of Mg. The hot extrusion process and heat treatment are combined; due to heat treatment, a beta-Mg17Al12 strengthening phase in the Mg-Al-Zn-Y rare-earth magnesium alloy in an extruded state has dispersed distribution in grains and grain boundary, the precipitated phase is uniform and fine, and the generated rare earth phase Al2Y is in corner passivation and is mainly distributed in grains, so that the mechanical property is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing. Background technique [0002] Magnesium alloy is a typical lightweight metal material in practical applications due to its advantages of low density, high specific strength, good damping, machinability and casting performance, and has good development space in the automotive, communication and aerospace industries. However, due to the shortcomings of magnesium alloys such as poor processing and forming properties, low elastic modulus, poor creep resistance and high temperature strength, and high shrinkage during solidification, the application of magnesium alloys will be limited. [0003] In recent years, the introduction of rare earth elements into magnesium alloys to improve the properties of magnesium alloys has received extensive attention. Rare earth is an excellent reinforcing element for magnesium alloys, and its specific functions include: melt purification, fluidity e...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C22F1/06C22C23/02
Inventor 闫洪王志伟邵俊
Owner 重庆山渝道科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap