High-strength and high-plasticity heat-resistant magnesium alloy with adjustable LPSO structure and nanometer precipitated phase and preparing method thereof

A nano-precipitation, magnesium alloy technology, applied in the field of alloy processing, can solve the problems of elongation drop, alloy plasticity drop, etc.

Active Publication Date: 2017-08-18
南通河海大学海洋与近海工程研究院 +1
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the strength of the alloy can be effectively improved by using the LPSO structure and the nanoscale β' precipitated phase, but the plasticity of the alloy will decrease significantly, and with the increase of the volume fraction of the LPSO phase or β' precipitated phase in the alloy, the elongation drops sharply (low at 3%)

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
  • High-strength and high-plasticity heat-resistant magnesium alloy with adjustable LPSO structure and nanometer precipitated phase and preparing method thereof
  • High-strength and high-plasticity heat-resistant magnesium alloy with adjustable LPSO structure and nanometer precipitated phase and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The alloy ingot whose composition is Mg-10wt%Y-3.32wt%Zn, Y:Zn atomic ratio is 2.2 is cut, placed in an equal channel angular extrusion die at 280°C for 30min, and then the ingot is subjected to 12 Pass continuous equal-channel angular extrusion to obtain ultra-fine-grained blocks; place the above-mentioned ultra-fine-grained blocks in a heat treatment furnace at 350 ° C for 2 hours, take them out and quickly place them in 25 ° C water for quenching; then place them in a vacuum oven Insulated at 225°C for 30h, taken out and quickly placed in 25°C water for quenching, to obtain an ultrafine-grained magnesium alloy containing LPSO structure and nano-precipitated phase. The average diameter of ultrafine grains in the alloy is about 1.3 μm, and the volume fraction of LPSO phase is 32%. figure 1 It is a TEM photo of the 14H-LPSO phase and the nano-precipitated phase in the ultrafine grains. The width of the 14H layer plate precipitated in the crystal is about 60nm, and the l...

Embodiment 2

[0026]The composition is Mg-11wt%Y-4wt%Zn, and the alloy ingot with Y:Zn atomic ratio of 2 is cut, placed in an equal channel angular extrusion die and kept at 300°C for 30min, and then the ingot is subjected to 16 passes Sub-continuous equal-channel angular extrusion to obtain ultra-fine-grained blocks; place the above-mentioned ultra-fine-grained blocks in a heat treatment furnace at 360 ° C for 4 hours, take them out and quickly place them in 25 ° C water for quenching; then place them in a vacuum oven Insulate at 220° C. for 28 hours, take it out and place it in water at 25° C. for quenching quickly to obtain an ultrafine-grained magnesium alloy containing LPSO structure and nano-precipitated phase. The average diameter of ultrafine grains in the alloy is about 1.1 μm, and the volume fraction of LPSO phase is 38%. The mechanical properties of the alloy are shown in Table 1.

Embodiment 3

[0028] The composition is Mg-12wt%Y-4wt%Zn, and the alloy ingot with Y:Zn atomic ratio of 2.2 is cut, placed in an equal-channel angular extrusion die at 310°C for 30min, and then the ingot is subjected to 16 passes Sub-continuous equal-channel angular extrusion to obtain ultra-fine-grained blocks; place the above-mentioned ultra-fine-grained blocks in a heat treatment furnace at 370 ° C for 5 hours, take them out and quickly place them in 25 ° C water for quenching; then place them in a vacuum oven Insulate at 210° C. for 25 hours, take it out and place it in water at 25° C. for quenching to obtain an ultrafine-grained magnesium alloy containing LPSO structure and nano-precipitated phase. The average diameter of ultrafine grains in the alloy is about 1.0 μm, and the volume fraction of LPSO phase is 44%. The mechanical properties of the alloy are shown in Table 1.

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
yield strengthaaaaaaaaaa
elongationaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparing method of a high-strength and high-plasticity heat-resistant magnesium alloy with an adjustable LPSO structure and a nanometer precipitated phase. The preparing method comprises the following steps: A, cutting a Mg-Y-Zn alloy ingot, placing the alloy ingot in an equal-channel angular pressing (ECAP) die, carrying out thermal insulation at 280-330DEG C, and then carrying out ECAP treatment on the ingot so as to obtain an ultra-fine crystal bulk; and B, placing the ultra-fine crystal bulk in a thermal treatment furnace, carrying out thermal insulation at 350-400DEG C for 2-8 hours, carrying out quenching, then placing the ultra-fine crystal bulk in a vacuum oven, carrying out thermal insulation at 200-225DEG C for 22-30 hours, and carrying out quenching so as to obtain ultra-fine crystal magnesium alloy containing an LPSO structure and a nanometer precipitated phase. The high-plasticity ultra-fine crystal rare-earth magnesium alloy containing the LPSO structure is obtained through ECAP processing. Besides, by using double heat treatment to adjust the LPSO structure in the alloy, introducing the nanometer precipitated phase and utilizing the organic combination and unification of three enhancing factors, such as fine-crystal enhancement, LPSO phase enhancement and nanometer precipitated phase enhancement, the heat-resistant magnesium alloy with high strength, high plasticity and high creep resistance is obtained.

Description

technical field [0001] The invention relates to a high-strength, high-plasticity heat-resistant magnesium alloy for regulating and controlling LPSO structure and nano-precipitated phase and a preparation method thereof, belonging to the technical field of alloy processing. Background technique [0002] As the lightest metal structural material, magnesium has broad application prospects in the field of lightweight. However, the disadvantages of magnesium alloys, such as low absolute strength, insufficient room temperature plasticity and poor heat resistance, severely limit its promotion and use in various fields. Rare earth magnesium alloys (Mg-RE series) are typical representatives of high-strength magnesium alloys in the existing magnesium alloy system. Due to the unique properties of RE elements, Mg-RE alloys can obtain high or even ultra-high strength through solid solution strengthening, precipitation strengthening, and composite strengthening. Generally speaking, the ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/002C22F1/06
Inventor 刘欢李程杨晓伟孙甲鹏宋丹江静华马爱斌
Owner 南通河海大学海洋与近海工程研究院
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