JPS6310222B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Field The present invention is directed to an aluminum alloy atomizing method,
Extrusion, rolling, forging, sintering, and high-temperature isostatic pressing are performed from rapidly solidified aluminum alloy material (powder, flake, ribbon-like form) obtained by rapidly cooling and solidifying by a rapid solidifying method such as a roll method. It relates to a molded material formed into a desired shape by a conventional high-temperature compression process such as pressing. Prior Art In materials such as automobile engine connecting rods, gas turbine impellers or fan blades, or supersonic aircraft bodies, 100
High temperature strength at ~400°C is required. Using aluminum alloys as these materials provides significant advantages in terms of weight reduction. However, the strength of conventional aluminum alloys significantly decreases when the temperature exceeds 150°C, so they could not be used for the above applications. However, in recent years, Al-Fe alloys, namely Al-8Fe-4Ce, which are formed by high-temperature compression processing from alloy powder obtained by rapid solidification, have been developed as heat-resistant aluminum alloy forming materials suitable for the above-mentioned uses.
Molding materials such as Al-8Fe-2Co and Al-8Fe-2Mo are provided. Problems to be Solved by the Invention In the case of a molded material obtained from the rapidly solidified material of the Al-8Fe-4Ce alloy, the addition of Ce leads to an increase in product cost because Ce is expensive, and the above-mentioned problem also arises. Similar forming materials of Al-8Fe-2Co and Al-8Fe-2Mo alloys each have drawbacks such as not necessarily having sufficient high temperature strength. The object of the present invention is the above-mentioned Al-8Fe
- Eliminates the above-mentioned drawbacks of molded materials obtained from rapidly solidified materials of aluminum alloys such as 4Ce, Al-8Fe-2Co or Al-8Fe-2Mo by conventional high-temperature compression processing. The object of the present invention is to provide a molded material made of a rapidly solidified aluminum alloy material with a new composition that provides excellent high-temperature strength without adding Ce. Means for Solving the Problems The present invention is a molded product of a rapidly solidified aluminum alloy material having a specific composition as shown below, which has excellent high-temperature strength and has an intermetallic compound having an average grain size of 0.1 to 1 μm. This is an aluminum alloy molded material. Fe: 4-15% Mo: 0.5-8% Zr: 0.3-8% Ti: 0.5-8% Cr: 0.5-8% Mn: 0.5-8% Any one or more Al: Substantially the remainder Effects The effects of each component of the alloy used as the rapidly solidified material in the present invention in the alloy will be described in relation to their contents. Fe: becomes a fine intermetallic compound during rapid solidification,
It is dispersed in the matrix and its dispersion-strengthening effect increases the strength of the molded material at room and high temperatures. This effect is not sufficient when the content is less than 4%, and on the other hand, when the content exceeds 15%, not only is the degree of effect saturated, but the ductility of the molded material is reduced. By dispersing the intermetallic compound containing Mo:Fe more finely and stabilizing the compound even at high temperatures, the high-temperature strength of the molded material is increased. This effect is not sufficient when the content is less than 0.5%, and on the other hand, even if the content is greater than 8%, the degree of effect is saturated and costs increase. Zr: Helps disperse intermetallic compounds containing Fe and improves dispersion strengthening effect. This effect is remarkable at relatively low temperatures (room temperature to 150°C). This effect is not sufficient when the content is less than 0.3%;
On the other hand, even if the content is higher than 8%, the degree of action is saturated and the cost increases. Ti, Cr, Mn: As mentioned above, for aluminum alloys containing Fe, Mo and Zr, Ti, Cr, Mn
are added singly or in combination of two or more. These components help disperse intermetallic compounds containing Fe,
Further improves the dispersion strengthening effect and increases the strength of the molded material. This is remarkable at high temperatures (200°C or higher). This effect is not sufficient when the content of both is less than 0.5%; on the other hand, when the content of both is less than 8%,
%, the degree of effect is saturated,
resulting in increased costs. Since the rapidly solidified material used in the present invention is made by gas atomization, the cooling rate is 10 ³
The structure of the resulting powder, flakes, and ribbons, which is as small as ~10 ⁴ °C/sec, is that of a dendrite cell structure, and the structure obtained by pre-compression, high-temperature vacuum degassing, and molding is as follows: The intermetallic compound has an average particle size of 0.1 to 1 μm. FIG. 1 is a microscopic photograph showing the structure of a rapidly solidified material of Example No. 4, which will be described later, and FIG. 2 is a microscopic photograph showing the structure of the same molded material. Next, examples of the present invention will be described in comparison with comparative examples. Example Alloys No. 1 to No. 13 listed in Table 1 were melted, and the molten metals were rapidly cooled and solidified by Ar gas atomization to obtain rapidly solidified powder. This powder is 64φ×100mm by cold isostatic pressing (CIP).
A compressed product (density: 70-80% of the degree of vacuum) was sealed in an aluminum can and subjected to high-temperature vacuum degassing. Next, this was billeted and extruded at 400°C into a rod of 20 mmφ. Separately, alloy No. 14 was melted and then continuously cast to form an ingot with a diameter of 152.4 mm (6 inches), from which a rod with a diameter of 44 mm was extruded. Then, for this alloy only, T6 treatment (530℃×
24 hours → hot water cooling → 200℃ x 20 hours). A tensile test was conducted on each alloy rod obtained as described above at room temperature and 250°C (holding time 100 hours). The results are shown in Table 2. Note that the alloy rod numbers in Table 2 correspond to the alloy numbers in Table 1.

【table】

【table】

[Table] As is clear from Table 2, the room temperature strength and high temperature strength of alloy rods No. 1 to No. 10 related to the molded material of the present invention are as follows:
The strength is higher than all of the alloy rods of the comparative examples, and especially higher than those of alloys No. 11 to No. 13, which are conventionally known for use in high-temperature compression molded materials of alloys produced by rapid solidification. The true value of the aluminum alloy used as the rapid solidification material in the present invention is demonstrated when a rapid solidification method is applied. As the rapid solidification method, any method such as the gas atomization method, roll method, or splat quench method may be used, but it is usually preferable to use a method that can obtain a cooling rate of 100°C/s or more. Appropriate. Effects of the Invention (1) In contrast to the conventional high-temperature forming material using a rapidly solidified Ce-added aluminum alloy material, the present invention uses an aluminum alloy without Ce addition as the rapidly solidified material. The molded material having high room temperature strength and high temperature strength can be manufactured at low cost. (2) The molded material made of the rapidly solidified material of the present invention has higher room temperature strength and high temperature strength than the conventional molded material made of the rapidly solidified material of Al-8Fe-2Co or Al-8Fe-2Mo aluminum alloy. has. (3) The molded material made of the rapidly solidified material of the present invention can be used in high-temperature environments where heat-resistant aluminum alloy materials produced by the conventional ingot method cannot be used, particularly in environments at temperatures above 150°C. By providing aluminum alloy material to equipment used in this environment, the weight of the equipment can be reduced, so the molded material of the present invention has great technical and economic value.

[Brief explanation of the drawing]

FIG. 1 is a photomicrograph showing the metallographic structure of a rapidly solidified material in an example of the present invention, and FIG. 2 is a photomicrograph showing the metallographic structure of a molded article.

Claims (1)

[Claims] 1 Fe: 4-15%, Mo: 0.5-8% and Zr: 0.3
-8% and further contains one or more of Ti: 0.5-8%, Cr: 0.5-8% and Mn: 0.5-8%, and the remainder is substantially Al. An aluminum alloy molded material having excellent high-temperature strength, which is a molded product having an intermetallic compound having an average grain size of 0.1 to 1 μm.