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Heat resistant magnesium alloy and production process thereof

Inactive Publication Date: 2009-06-25
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]An object of the present invention is to provide, by overcoming these disadvantages, a heat-resistant magnesium alloy which has at the same time both high strength and high ductility even under high temperature environment and is also inexpensive.

Problems solved by technology

Common magnesium alloys are, however, degraded in mechanical properties such as tensile strength and elongation in a high temperature range from 200 to 250° C., and cannot attain a high temperature strength comparable to the strength of heat-resistant aluminum alloys such as the cast AC8B-T6 material and the wrought A4032-T6 material.
However, the above-described heat-resistant magnesium compound further needs a plastic processing after casting, and the plastic processing needs a large amount of energy to increase the production cost.

Method used

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  • Heat resistant magnesium alloy and production process thereof
  • Heat resistant magnesium alloy and production process thereof
  • Heat resistant magnesium alloy and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 4

[0024]In present Examples, a molten alloy was obtained by melting at a temperature of 850° C. a metal material including, in relation to the total amount of the metal material, 2 at % of Zn, 2 at % of Y, 0.2 at % of Zr and 95.8 at % of Mg. In the molten alloy, the composition ratio Zn / Y between Zn and Y was 1.0.

[0025]Next, by means of gravity casting, the obtained molten alloy was poured into a mold made of oxygen-free copper (C1020, purity: 4N) to yield a cast product of a heat-resistant magnesium alloy. This casting was conducted while the molten alloy was being maintained at temperatures within a range from 800 to 850° C.

[0026]As shown in FIG. 1, a cast product 1 obtained in present Examples was, as viewed in plan, rectangular and of a size of 46 mm×56 mm. Additionally, as shown in FIG. 2, the thickness of the cast product 1 was varied stepwise from t1 to t4 along the long side, wherein t1=2 mm (Example 1), t2=4 mm (Example 2), t3=8 mm (Example 3) and t4=16 mm (Example 4).

[0027]T...

example 5

[0034]In present Example, a 2-mm-thick cast product was obtained in exactly the same manner as in Example 1 except that a metal material including, in relation to the total amount of the metal material, 1.2 at % of Zn, 1.2 at % of Y, 0.2 at % of Zr and 97.4 at % of Mg was used. In the molten alloy obtained by melting the metal material, the composition ratio Zn / Y between Zn and Y was 1.0. The cooling rate of the cast product was 668 K / sec.

[0035]Next, a specimen 2 having the shape shown in FIG. 4 was cut out from the cast product obtained in present Example, and subjected to the measurements of the tensile strength and the elongation in exactly the same manner as in Example 1 except that the specimen 2 was heated in air to 250° C. by induction heating. The results thus obtained are shown in Table 1.

example 6

[0036]In present Example, a 2-mm-thick cast product was obtained in exactly the same manner as in Example 1 except that a metal material including, in relation to the total amount of the metal material, 3 at % of Zn, 3 at % of Y, 0.2 at % of Zr and 93.8 at % of Mg was used. In the molten alloy obtained by melting the metal material, the composition ratio Zn / Y between Zn and Y was 1.0. The cooling rate of the cast product was 668 K / sec.

[0037]Next, a specimen 2 having the shape shown in FIG. 4 was cut out from the cast product obtained in present Example, and subjected to the measurements of the tensile strength and the elongation in exactly the same manner as in Example 1 except that the specimen 2 was heated in air to 250° C. by induction heating. The results thus obtained are shown in Table 1.

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Abstract

Provided are a heat-resistant magnesium alloy which has at the same time both high strength and high ductility even under high temperature environment and is also inexpensive, and a production process of the heat-resistant magnesium alloy. The heat-resistant magnesium alloy includes, in relation to the total amount of the alloy, 1 to 3 at % of Zn, 1 to 3 at % of Y and 0.01 to 0.5 at % of Zr with the balance composed of Mg and inevitable impurities, wherein the composition ratio Zn / Y between Zn and Y falls within a range from 0.6 to 1.3, an a-Mg phase and an intermetallic compound Mg3Y2Zn3 phase are finely dispersed, and a long period stacking ordered structure phase is formed in a three-dimensional network shape. The heat-resistant magnesium alloy can be produced by melting a metal material having the above-described composition at temperatures within a range from 650 to 900° C., pouring the molten metal material into a mold and cooling the molten metal material at a rate of 10 to 103 K / sec.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a heat-resistant magnesium alloy and a production process thereof.[0003]2. Description of the Related Art[0004]Magnesium is lighter in weight than iron and aluminum, and hence the use of magnesium as a lightweight substitute for members made of a steel iron material or an aluminum alloy material is being investigated. Common magnesium alloys are, however, degraded in mechanical properties such as tensile strength and elongation in a high temperature range from 200 to 250° C., and cannot attain a high temperature strength comparable to the strength of heat-resistant aluminum alloys such as the cast AC8B-T6 material and the wrought A4032-T6 material.[0005]Accordingly, there have hitherto been proposed various heat-resistant magnesium alloys which have at the same time both high strength and high ductility even under high temperature environment. Among such heat-resistant magnesium alloys, ...

Claims

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Application Information

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IPC IPC(8): C22C23/04B22D30/00
CPCB22D21/007C22C23/04B22D30/00
Inventor INOUE, KENSHIIENAGA, YUICHI
Owner HONDA MOTOR CO LTD
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