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Magnesium Alloy

a technology of magnetism and alloy, applied in the field of magnetism alloys having superior hightemperature, can solve the problems of no mechanism for pinning the grain boundary or controlling grain growth, mg alloys for forging, az31b, etc., and achieve the effect of high temperature strength

Inactive Publication Date: 2007-09-06
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] The high-strength magnesium alloy of the invention has been made in view of the aforementioned problems, and it is an object of the invention to improve the strength, particularly high-temperature strength, of a Mg—Zn-RE alloy.
[0020] (1) The α-Mg crystal grains occupy 50% or more in volume, and the alloy contains nanoparticles having a complicated structure, such as quasicrystal or approximate crystal, at the α-Mg crystal grain boundary. The quasicrystal herein refers to a new ordered structure having no translational symmetry but having fivefold or tenfold symmetry and quasiperiodicity, which are not crystallographically allowed. Alloys known to produce quasicrystal include Al—Pd—Mn, Al—Cu—Fe, Cd—Yb, and Mg—Zn—Y, for example. Because of its specific structure, the quasicrystal has specific characteristics, such as high degree of hardness, high melting point, and low μ, as compared with ordinary crystals. (2) Fine precipitates (1 μm or smaller) are uniformly dispersed within the α-Mg crystal grains. Such fine precipitates enhance the strength of the magnesium alloy of the invention.
[0023] (5) Due to aging after solution heat treatment, approximate crystals or the like having grain diameter of 100 nm or smaller are precipitated at high number density. As a result, precipitates having grain diameter of several tens to hundreds of nm are dispersed at high concentration within the α-Mg grains, together with products crystallized upon casting. Such precipitates highly interact with dislocation and do not become dissolved until nearly 230° C. The quasicrystal and approximate crystal that exist in the α-Mg crystal grain boundary control the grain boundary sliding at high temperature. Their synergistic effect provides very high-temperature strength.

Problems solved by technology

Furthermore, Mg alloys for forging, such as AZ61A and AZ31B, have no mechanism for pinning the grain boundary or controlling grain growth at high temperatures.

Method used

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Examples

Experimental program
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Effect test

example 1

[0032] An alloy of Mg-6Zn-0.1Zr-0.9Y (at. %) cast material was manufactured by the following steps.

(1) Materials

Pure Mg (99.9%): 1649 g

Pure Zn (99.99%): 286 g

Pure Zr (99.9%): 6.7 g

Pure Y (99.9%): 58 g

(2) Dissolution

[0033] Pure Mg was dissolved in an iron crucible, and molten metal was maintained at 700° C. Other constituent materials were added in the molten metal, which was stirred while its temperature was maintained at approximately 700° C. until all the materials were uniformly dissolved. The order of addition of the constituent materials in the molten metal does not affect characteristics and is therefore not specified.

(3) Casting

[0034] The alloy molten metal whose temperature was maintained at approximately 700° C. was cast in a JIS 4 boat-shaped mold which had been preheated to about 100° C.

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PUM

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Abstract

A magnesium alloy containing 2.0 to 10 at. % zinc, 0.05 to 0.2 at. % zirconium, 0.2 to 1.50 at. % rare earth element, and the balance being magnesium and unavoidable impurities. The Mg—Zn-RE has improved strength, particularly high-temperature strength.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnesium alloy having superior high-temperature strength. More particularly, the invention relates to a particle-dispersed magnesium alloy having superior high-temperature strength. BACKGROUND ART [0002] Magnesium has the specific gravity of 1.74 and is the lightest among the metal materials for industrial purposes. Its mechanical property is comparable to that of aluminum alloy, and for that reason it has drawn attention as a material suitable for aircraft and automobiles, particularly as a material contributing to light weight and improved mileage. [0003] For example, magnesium alloy has already been used as the material for automotive wheels or engine head covers. There is currently a growing demand for making components of all kinds more lightweight, and the range of application of magnesium alloy is becoming wider. Applications of magnesium alloy under consideration include structural components, such as engine blocks, ...

Claims

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Application Information

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IPC IPC(8): C22C23/04
CPCC22C23/04
Inventor KATO, AKIRATSAI, AN-PANGWATANABE, MASAKI
Owner TOYOTA JIDOSHA KK