Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Magnesium alloy having high ductility and high toughness, and preparation method thereof

a technology of ductility and toughness, applied in the field of magnesium alloys having high ductility and high toughness, can solve the problems of low formability, less consideration of magnesium for extended applications in the industries, and limited formability of magnesium alloys, and achieve the effects of high ductility and toughness, precipitation hardening effect, and degradation of ductility

Inactive Publication Date: 2014-11-13
KOREA INST OF MASCH & MATERIALS
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is for a magnesium alloy that has improved ductility and toughness compared to conventional commercial magnesium alloys. This is achieved by adding zinc and optionally adding one or more species selected from the group consisting of aluminum, manganese, and rare earth metal to a magnesium alloy with a small amount of tin and the ability to have precipitate hardening. By limiting the formation of micro precipitate phase, the alloy has increased ductility and toughness, which makes it useful across various industries including transportation equipment.

Problems solved by technology

However, since magnesium with hexagonal crystalline structure has low formability at room temperature, compared to the other metals with cubic crystalline structure such as copper, iron or aluminum, magnesium has been less considered for extended application in the industries.
According to Shin et al., although the magnesium alloy has improved tensile characteristic compared to the other commercial magnesium alloys, the magnesium alloy still has limited formability.
Therefore, the increasing zinc content causes deteriorating ductility of the material, and it can also cause irregular quality of the final form of magnesium alloy depending on areas.

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
  • Magnesium alloy having high ductility and high toughness, and preparation method thereof
  • Magnesium alloy having high ductility and high toughness, and preparation method thereof
  • Magnesium alloy having high ductility and high toughness, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 11

Preparation of Extruded Magnesium Alloy Material 1 to 11

Step 1. Melting Magnesium Alloy Raw Material

[0087]Using pure Mg(99.9 wt %), pure Sn(99.9 wt %), pure Zn(99.995 wt %), pure Al(99.9 wt %), Mg—Mn master alloy(Mn:3.17 wt %), pure Ce(99.9 wt %), pure Y(99.9 wt %) and pure Gd(99.9 wt %), the magnesium alloy with the composition as listed in Table 2 below was melt in graphite crucible using high frequency induction melting furnace. A mixed gas of SF6 and CO2 was applied to the top of the melt, to prevent oxidization by isolating the melt from possible exposure to air.

TABLE 2Alloying composition(wt %)AlloySnZnAlMnCeYGdMgExample 1TZ2020.5—————Bal.Example 2TZ2121—————Bal.Example 3TZ2222—————Bal.Example 4TZA211211————Bal.Example 5TZA212212————Bal.Example 6TZM21021—0.5———Bal.Example 7TZAM21102110.5———Bal.Example 8TZ21-Ce21——0.5——Bal.Example 9TZ21-Y21———0.5—Bal.Example 10TZ-Gd21————0.5Bal.Example 11TZA211-Gd211———0.5Bal.

Step 2. Casting Magnesium Alloy

[0088]The melt of magnesium alloy of S...

example 12

Preparation of Extruded Magnesium Alloy Material 12

[0091]The extruded magnesium alloy material was prepared in the same manner as Example 2, except for difference that the extruded magnesium alloy material prepared at Example 2 additionally underwent aging treatment at 200° C. for 144 hr.

experimental example 1

Microstructure Analysis

[0093]In order to analyze the microstructure of the magnesium alloy fabricated according to the present invention, electron back scattered diffraction (EBSD) and transmission electron microscope (TEM) were used, and the following results were obtained (see FIGS. 1 to 4).

[0094]Referring to FIGS. 1 to 3, the magnesium alloy fabricated according to the present invention shows isotropic microstructure, with its basal plane being in parallel arrangement along the direction of extrusion, and average grain size being 23.7 μm.

[0095]Further, referring to FIG. 4, the extruded magnesium alloy material fabricated according to the present invention has a small amount of fine second-phase (approximately, 50 to 500 nm in size) along the grain boundary and within the grain.

[0096]From the result shown in FIG. 4, it is concluded that the fine second-phases dispersed along the grain boundary and within the grain of the extruded magnesium alloy material are the Mg2Sn phase formed...

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
temperatureaaaaaaaaaa
temperatureaaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

A magnesium alloy having high ductility and high toughness, and a preparation method thereof are provided, in which the magnesium alloy includes 1.0-3.5 wt % of tin, 0.05-3.0 wt % of zinc, and the balance of magnesium and inevitable impurities, and a preparation method thereof. Magnesium alloy with a relatively small tin content is added with zinc, and optionally, with one or more alloy elements selected from aluminum, manganese and rare earth metal, at a predetermined content ratio. As a result, the alloy exhibits superior ductility and moderate strength due to the suppression of excessive formation of precipitates and some precipitates hardening effect, respectively. Accordingly, compared to extruded material prepared from conventional commercial magnesium alloys, higher ductility and toughness are provided, so that the alloy can be widely applied over the entire industries including automotive and aerospace industries.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This is a continuation of International Patent Application No. PCT / KR2012 / 011831, filed Dec. 31, 2012, which claims the benefit Korean Patent Application No. 10-2012-0008995, filed on Jan. 30, 2012. Each of these is incorporated herein by reference in its entirety.FIELD[0002]The present invention relates to a magnesium alloy having high ductility and high toughness, and preparation method thereofBACKGROUND[0003]Recently, researchers seek ways to further increase energy efficiency of transportation equipments by way of power source development and performance improvement, or light-weighting of parts. Among these efforts, researchers particularly study ways to improve light-weightness and subsequent fuel efficiency, because components of lighter weight can increase energy efficiency at lower cost.[0004]As a metal material that can be considered for the purpose of light-weighted parts, magnesium alloys are in increasing demand in the transpor...

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(United States)
IPC IPC(8): C22F1/06B21C23/00C22C23/04B21C23/08C22C23/00C22C23/02
CPCC22F1/06C22C23/00C22C23/02C22C23/04B21C23/08B21C23/002B22D21/007C22C1/02B22D21/04C22C23/06
Inventor PARK, SUNG HYUKKIM, YOUNG MINKIM, HA-SIKYOU, BONG SUNYIM, CHANG DONG
Owner KOREA INST OF MASCH & MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com