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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]The magnesium alloy according to the present invention can be widely applied over the entire industries including transportation equipments due to relatively higher ductility and toughness than the extruded materials prepared from conventional commercial magnesium alloys, because degradation of ductility due to excessive presence of precipitates is minimized and precipitate hardening effect is provided, by adding zinc and optionally adding one or more species selected from the group consisting of aluminum, manganese and rare earth metal at a predetermined content ratio to a magnesium alloy which has a small tin content and which can have precipitate hardening, thus limiting formation of micro precipitate phase to a small amount.

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

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  • 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...

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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

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Application Information

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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
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