Al-Si based alloy and alloy member made therefrom

Inactive Publication Date: 2005-10-06
HONDA MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0017] As shown in the above, according to the present invention, an Al—Si based alloy which exhibits superior weldability in diecasting under high vacuum conditions can be obtained by optimizing of contents of Si, Mg, Mn, Cu, Fe, and Sr which are constituent elements in the alloy. In welding of alloy members produced by using the alloy of the present invention, by improving the weldability, plate thickness of welded portion in the alloy members is decreased and length of weld bead is shortened, and the alloy members obtained by

Problems solved by technology

However, the products made of these alloys do not exhibit superior weldability.
That is, in the case in which conventional Al—Si based alloys obtained by diecasting are welded, welded metal flows out, and sufficient weld bead dimensions such as throat thickness and leg length are not obtained.
Therefore, in either case, strength of the welded portion after welding is not sufficiently obtained.
For example, when the Si content in the

Method used

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[0032] In the following, the present invention will be explained in more detail by Examples.

[0033] Alloys having the compositions shown in Table 1 were dissolved at 720° C., respectively and then were deoxidized and degassed by molten metal treatment using Ar gas and flux. Next, under a vacuum condition at an internal pressure of a metal mold of 5 kPa and at molten metal temperature 700° C., the alloys were cast using a metal mold for plate-shaped diecasting having width of 100 mm, depth of 300 mm, and height of 5 mm, and plate-shaped diecasting products having each composition shown in Table 1 (Examples 1 to 5 and Comparative Examples 6 to 12 of the present invention) were thereby obtained. Here, temperature of the metal mold was 150° C. Subsequently, the above diecasting products were subjected to each heat treatment which was respectively suitable under the condition described in Table 1.

TABLE 1units: mass %Heating ConditionSiFeCuMnMgZnTiSr(only Aging)Example 17.50.130.140.460...

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Abstract

An Al—Si based alloy and an alloy member made of the alloy, in which when alloys produced by diecasting under high vacuum conditions are welded, weldability can be improved without increasing plate thickness of welded portions and reducing gas content in diecasting.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an Al—Si based alloy and to an alloy member made of the Al—Si based alloy, and in particular, relates to a technique for producing an Al—Si based alloy which is produced by diecasting under a high vacuum and has good weldability. [0003] 2. Related Art [0004] Until now, various techniques have been disclosed as production methods for casting by diecasting of aluminum. For example, in order to improve mechanical properties, in particular, elongation by aging only, without solution heat treatment, Japanese Unexamined Patent Application Publication No. 7-91624 discloses a production method of aluminum alloy casting including a step for forming a casting by diecasting aluminum alloy, a step for coating on the casting, and a step for heating which bakes the coating on the coated casting and aging the casting at the same time, wherein the aluminum alloy includes, by weight, Si at 7.5 to 9.5...

Claims

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Application Information

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IPC IPC(8): B22D17/00C22C21/02B22D17/14C22C21/04
CPCB22D17/00B22D17/14C22C21/02
Inventor FUKUCHI, FUMIAKIYAHABA, TAKANORI
Owner HONDA MOTOR CO LTD
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