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High-strength magnesium alloy and process for production thereof

A manufacturing method and technology for magnesium alloys, applied in the field of high-strength magnesium alloys, can solve problems such as cost increase, and achieve high-strength effects

Inactive Publication Date: 2009-07-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Any of the above-mentioned magnesium alloys in the prior art realizes high high-temperature strength by dispersing quasicrystals and their approximate crystals in the Mg matrix as fine strengthening particles, but all of them contain rare earth elements (Y) as essential components, Therefore, there is inevitably the problem of cost increase

Method used

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  • High-strength magnesium alloy and process for production thereof
  • High-strength magnesium alloy and process for production thereof
  • High-strength magnesium alloy and process for production thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] According to the present invention, the final composition of the whole alloy is Mg-Zn-Zr magnesium alloy with the composition shown in Table 1, and the metal structure observation and tensile test are carried out.

[0040] (1) Fabrication of quasicrystals

[0041] Weigh out pure Mg (99.9%), pure Zn (99.99%), pure Zr (99.5%) each metal (the numerical value in parentheses represents purity), so that form Mg by at% ratio 11 Zn 83 Zr 6 The quasi-crystal composition, the total amount is 5g, put into a Taman tube (Ф12mm×10mm) made of alumina, and then seal it in a quartz tube. The interior of the quartz tube is replaced with high-purity argon.

[0042] The temperature was raised from room temperature to 700° C. over 5 hours, kept for 12 hours, then lowered to 500° C. and kept for 48 hours. Thus, the Mg 11 Zn 83 Zr 6 quasicrystal. Such as figure 1 As shown in the electron diffraction pattern of , the typical 5-fold symmetry can be confirmed.

[0043] The resulting ma...

Embodiment 2

[0059] According to the present invention, the final composition of the alloy as a whole is made as a Mg-Zn-Ti magnesium alloy with the composition shown in Table 1, and the alloy metal structure observation and tensile test are carried out.

[0060] In addition to making Mg 11 Zn 83 Ti 6 As a quasi-crystal and added to the pure Mg melt, the rest are produced in the same order as in Example 1.

[0061] After heat treatment, fine precipitates of tens of nanometers were observed in the α-Mg crystal grains in the form of white dots through a transmission electron microscope. Confirm that the precipitate is Mg 11 Zn 83 Ti 6 Quasicrystals and their near crystals.

[0062] Tensile tests were performed under the same conditions as in Example 1 for the samples after the heat treatment and the samples extruded under the same conditions as in Example 1.

[0063] In addition, the tensile test was similarly performed on the comparative material whose composition was outside the sco...

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Abstract

The invention provides a high-strength magnesium alloy which is improved in high-temperature strength without using any expensive rare earth element with cost reduction and a process for the production of the alloy. A high-strength magnesium alloy represented by the composition formula: Mg100-(a+b)ZnaXb(wherein X is at least one member selected from among Zr, Ti and Hf and a and b are contents of Zn and X respectively as represented in at% and satisfy the relationships (1), (2) and (3): (1) a / 28 = b = a / 9, (2) 2 < a < 10, and (3) 0.05 < b < 1.0), wherein Mg-Zn-X quasicrystals and approximants thereof in theform of fine particles are dispersed in a Mg mother phase; and a process for the production of the high-strength magnesium alloy which comprises melting Mg in an inert atmosphere to form molten Mg, adding Mg-Zn-X quasicrystals (wherein X is at least one of Zr, Ti and Hf) to the molten Mg to form a molten alloy, casting the molten alloy, and heat-treating the cast alloy to precipitate the quasicrystals and approximants thereof in the Mg mother phase.

Description

technical field [0001] The invention relates to a high-strength magnesium alloy, especially a magnesium alloy with improved high-temperature strength and a manufacturing method thereof. Background technique [0002] Magnesium alloys are increasingly used in various structural components due to their light weight. Especially when it is applied to automobiles, it can reduce fuel consumption and thereby play a protective effect on resources and the environment. [0003] As a commercially available material, commonly used magnesium alloys for sand casting are generally ASTMAZ91C (standard composition [wt%]: Mg-8.7Al-0.7Zn-0.13Mn), ASTM ZE41A (standard composition [wt%]: Mg-4.2Zn-1.2 RE-0.7Zr), etc. In addition, magnesium alloys for extension are generally ASTMAZ61A (standard composition [wt%]:: Mg-6.4Al-1.0Zn-0.28Mn), ASTMAZ31B (standard composition [wt%]:: Mg-3.0Al -1.0Zn-0.15Mn), etc. [0004] Among them, the alloys AZ91C and ZE41A for sand casting are precipitation effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22F1/06C22F1/00
CPCC22C1/0483C22C23/04C22F1/06
Inventor 蔡安邦大桥谕加藤晃
Owner TOYOTA JIDOSHA KK
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