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Aluminum alloy with excellent high-temperature strength and thermal conductivity, and process for production thereof

A technology of high temperature strength and manufacturing method, applied in the field of aluminum alloy, can solve the problems of lowering, crystallization easily destroys room temperature strength, etc., and achieves the effect of improving high temperature strength, excellent high temperature strength, and light weight ratio strength.

Active Publication Date: 2013-03-27
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, when the amount of addition is increased, the crystallization will be coarsened, and it will be easy to break from this as a starting point, resulting in a decrease in room temperature strength.

Method used

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  • Aluminum alloy with excellent high-temperature strength and thermal conductivity, and process for production thereof
  • Aluminum alloy with excellent high-temperature strength and thermal conductivity, and process for production thereof
  • Aluminum alloy with excellent high-temperature strength and thermal conductivity, and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~4、7、8

[0068] Aluminum alloy molten liquids adjusted to the compositions shown in Table 1 were prepared. The aluminum alloy molten liquid is cast by gravity casting into the JIS4 ship model (Japanese: 船形) whose soup injection temperature is heated from 740°C to 200°C. In addition, the cooling rate at this time was 24° C. / s to the liquidus line, and 5.9° C. / s from the liquidus line to the solidus line.

[0069] The obtained mold casting material was subjected to an aging treatment at 220° C. for 4 hours, followed by air cooling.

[0070] In order to perform a 350°C tensile test and a room temperature tensile test, a high temperature tensile test piece and a room temperature tensile test piece were cut out from each heat-treated alloy by cutting. In the high-temperature tensile test, a test piece preheated at 350° C. for 100 hours was used as an object.

[0071] The evaluation of the thermal conductivity was performed by measuring the thermal conductivity proportional to each heat-tr...

Embodiment 5

[0076] The aluminum alloy molten liquid adjusted to the composition shown in Table 1 was melted. The aluminum alloy molten liquid was cast from a casting temperature of 700°C into a JIS4 ship model heated to 160°C by gravity casting. In addition, other castings were performed in the same manner as in Examples 1 to 4.

[0077] The obtained mold casting material was subjected to an aging treatment at 220° C. for 4 hours, followed by air cooling. Thereafter, in the same manner as in Example 1, a 350° C. tensile test, a room temperature tensile test, and evaluation of thermal conductivity were performed.

[0078] Table 2 shows the 350° C. tensile properties, room temperature tensile properties, and thermal conductivity at this time together.

Embodiment 6

[0080] As shown in Table 1, an aluminum molten liquid having the same composition as in Example 5 was prepared in a crucible disposed in a melting furnace. Then, after preheating the ultrasonic steel mold made of Nb-Mo alloy in the preheating furnace, the steel mold is immersed in the aluminum molten liquid in the crucible and irradiated with ultrasonic waves.

[0081] The ultrasonic generator used at this time was the ultrasonic generator manufactured by VIATECH Corporation, and it was set to irradiate ultrasonic waves with a frequency of 20 to 22 kHz and an acoustic output of 2.4 kw. The vibration amplitude of the steel mold was set to 20 μm (p-p). The crucible was taken out, and after 20 seconds from the end of ultrasonic irradiation, gravity casting was performed in a JIS No. 4 metal mold heated to 160° C. at a casting temperature of 700° C. The liquidus line of the molten liquid at this time was 700° C. with respect to the end temperature of ultrasonic waves of 640° C., ...

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Abstract

An aluminum alloy with excellent high-temperature strength and thermal conductivity, which is created both by adjusting the composition thereof so as to inhibit the deterioration of high -temperature strength and by minimizing the Mn content to reduce the amount of Mn solid-soluted in aluminum. An aluminum alloy having a composition which contains 12 to 16 mass% of Si, 0.1 to 2.5 mass% of Ni, 3 to 5 mass% of Cu, 0.3 to 1.2 mass% of Mg, 0.3 to 1.5 mass% of Fe, 0.004 to 0.02 mass% of P, 0 to 0.1 mass% of Mn, and, if necessary, at least one of 0.01 to 0.1 mass% of V, 0.01 to 0.6 mass% of Zr, 0.01 to 0.2 mass% of Cr and 0.01 to 0.2 mass% of Ti. The aluminum alloy can be produced by subjecting a molten aluminum alloy having a composition as described above to ultrasonic irradiation at a temperature equal to or exceeding the liquidus curve, and then casting the resulting alloy within 100 seconds after the completion of the ultrasonic irradiation.

Description

technical field [0001] The present invention relates to an aluminum alloy excellent in high-temperature strength and thermal conductivity used in pistons for automobiles and the like, and a method for producing the same. Background technique [0002] Aluminum alloys generally have lower strength at higher temperatures. Therefore, aluminum alloys used at high temperatures, such as automobile pistons, have traditionally increased the addition of Si, Cu, Ni, Mg, Fe, and Mn in order to maintain high-temperature strength, thereby increasing the crystallization of second-phase particles and the like. . [0003] Among these additive elements for improving the high-temperature strength, Mn is added to improve the Fe-based compound. Although Fe-based compounds are effective for improving high-temperature strength, they tend to coarsen and become needle-shaped, and when coarsened, mechanical properties decrease. Therefore, Mn is added to achieve α-formation of the Fe-based compound...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02B22D21/04B22D27/08C22C1/02C22F1/043C22F3/02
CPCB22D23/00C22F3/02B22D21/007C22F1/043C22C1/026C22C21/02
Inventor 邢劼山元泉实织田和宏石田丰堀川宏
Owner NIPPON LIGHT METAL CO LTD
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