JPS6299425A - Manufacture of malleable material of al-base intermetallic compound - Google Patents

Abstract

PURPOSE:To easily manufacture a malleable material of a desired Al-base intermetallic compound by uniformly mixing Al powder with metallic powder of a different kind and subjecting the mixture to hot plastic working at a temp. below the m.p. of Al and diffusion treatment. CONSTITUTION:High purity Al powder is uniformly mixed with metallic powder of a different kind such as Ti, Ni, Mn or Fe powder. The particle size of the powders used is <= about 100 mesh. The powdery mixture is heated to a temp. below the m.p. of Al, e.g., about 350-600 deg.C and formed into a desired shape by hot plastic working. Diffusion treatment is then carried out at about 400-650 deg.C to produce a prescribed intermetallic compound. Thus, the uniform and fine intermetallic compound is easily produced in the desired shape.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to drawn materials made of Al-based intermetallic compounds, such as heat-resistant materials, wear-resistant materials, magnetic materials, etc.
L-Al-Ti, Afl-Ni.

The present invention relates to a method for manufacturing an Afl-based intermetallic compound wrought material such as A11-Fe or Afl-Mn.

Conventional Method In recent years, so-called SAP (St
tered Aiminum Powder),
Powder gold products or PRM using the required alloy powder
Metal matrix composite materials (MMC) such as SFRM are known.

Problems to be Solved by the Invention However, since SAP relies solely on dispersion strengthening by Al203, sufficient satisfaction has not yet been obtained in its mechanical strength properties, elongation, workability, etc.

In addition, in the case of PM products using alloy powders such as Aρ-Fe, there are not only problems with moldability during manufacturing, but also technical problems and difficulties such as coarse precipitation of alloy components during processing. It's thick.

Furthermore, MMC can be dispersion reinforced (D) by particles or fibers.
Since it depends only on S), there is a limit to the desired improvement in characteristics.

In order to solve the above-mentioned problems with the conventional technology, we have created an intermetallic compound that allows for flexibility in the selection of metals for compound formation.
Although it is desired to obtain products with arbitrary shapes, the above expectations cannot be easily realized because plastic working of Aρ-based intermetallic compounds is generally difficult.

In view of the background of the prior art as described above, this invention
This was done with the intention of manufacturing a material made of an l-based intermetallic compound by subjecting it to substantially free plastic working.

Means for Solving the Problems For the above-mentioned purpose, the present invention mixes Aρ coarse powder and different metal powders forming a compound, and in the state of the mixture, performs desired plastic working on the powder, A method is adopted in which a diffusion treatment is then added to finally produce a metal open compound having a desired free shape.

That is, the present invention provides Aρ substantially made of aluminum.
A process of uniformly mixing different metal powders to form a coarse powder compound, a process of heating this mixed powder to a predetermined temperature below the melting point of aluminum and subjecting it to hot plastic working, and then processing the processed product. The gist of this invention is a method for producing an AΩ-based intermetallic compound wrought material, which comprises a step of performing a diffusion treatment.

In the present invention, the ρ-based intermetallic compound wrought material does not necessarily mean that the entire material consists only of the AΩ-based intermetallic compound. If the compound is composed of Aρ and an Aρ-based intermetallic compound, or an additive metal for forming a compound and A! This also includes cases where the compound is composed of a two-base metal compound.

In addition to being made of pure aluminum, the Al powder used as the starting material may contain other elements as long as the Aρ coarse powder deformation resistance is not increased.

On the other hand, the dissimilar metal powder that forms a compound with aluminum may be any element that easily forms an intermetallic compound with aluminum, such as Ti, Mn, Ni, or Fe, and may be selected and used as desired depending on the intended use of the product. .

The Afl powder and the dissimilar metal powder for compound formation are preferably small to some extent, since if the powder diameter is too large, the workability will deteriorate and the diffusion process will take time.
A material having a mesh size of 100 meshes or less is preferably used.

It goes without saying that the two powders must be mixed as uniformly as possible. Therefore, it is recommended to use a mechanical alloying method or the like as the uniform mixing means.

The mixed powder is then heated to a predetermined temperature and subjected to hot plastic working into a predetermined shape. Examples of this plastic working include extrusion, rolling, and forging. In the case of extrusion and forging, it is also possible to process the mixed powder as is, but in the case of rolling, it is possible to process the mixed powder as it is, but in the case of rolling, it is possible to process the mixed powder as it is, but in the case of rolling, it is possible to process the mixed powder as it is, but in the case of rolling, it is possible to process the mixed powder as is. It goes without saying that the mixed powder should be preformed in advance.

The heating temperature during plastic working should be selected to be below the melting point of aluminum (approximately 660° C.) and at a temperature at which the Aρ coarse powder deformation resistance is sufficiently small. That is, by processing before diffusion progresses, the aluminum in the mixed powder has good workability, and any plastic working can be easily performed. Here, the processing temperature is preferably in the range of about 350 to 600°C. Of course, if the processing temperature is too low, the deformation resistance of the mixed powder is large, making plastic working difficult, while if it is too high, diffusion progresses, making free plastic working difficult.

After producing the desired shape by the above-mentioned plastic working, it is subsequently subjected to a diffusion treatment to form a predetermined intermetallic compound. In general, aluminum easily forms intermetallic compounds with transition metals, so it is possible to form various types of intermetallic compounds. Of course, this diffusion treatment should be carried out at a temperature below the melting point of the aluminum or the mating metal region, as well as of the intermetallic compound being formed. The higher the temperature, the shorter the treatment time, but it is desirable to carry out the treatment at 400 to 650° C. for several hours to several hundred hours.

Further, it is preferable that this diffusion treatment is performed under pressurized conditions, such as HIP, because a more uniform and favorable state of intermetallic compound formation can be obtained.

Effects of the Invention According to this invention, a material that is made of a base intermetallic compound or has physical properties suitable for various uses as a wrought material containing the intermetallic compound is mixed with metal powder that is easy to process. By plastic working such as extrusion, rolling, and forging in the body state, it can therefore be easily manufactured into any shape. Of course, since plastic working is performed on a mixed powder of Al powder and dissimilar metal powder,
There is flexibility in selecting the partner metal, and it is possible to obtain a desired intermetallic compound depending on the application. In addition, the crystals can be elongated by plastic working.

Examples Example 1 AΩ powder made of 150 meshes of pure aluminum,
Tl powder of the same particle size was uniformly mixed at a TI ratio of 16%.

Next, this mixed powder was pressed at a temperature of 500'C.

It was extruded into a round bar with a diameter of 12.5 mm in an extrusion 37.

The Vickers hardness of this as-extruded abrasive was HV=40.

Subsequently, this extruded material was heated at 500° C. for 48 hours to perform a diffusion treatment to obtain a product made of the desired intermetallic compound.

The Vickers hardness of this product was Hv-57.

Example 2 After uniformly mixing Ti powder with the same Afl powder as in Example 1 at a ratio of 64%, this mixture was sequentially subjected to extrusion processing and diffusion treatment in the same manner as in Example 1 to obtain the desired product. I got it. The hardness of the as-extruded material is HV-
78, whereas the hardness of the product after diffusion treatment was HV
=195, which was an extremely high value.

that's all

Claims (2)

[Claims] (1) A process of uniformly mixing an Al powder consisting essentially of aluminum with a dissimilar metal powder for forming a compound, and hot plastic processing by heating this mixed powder to a predetermined temperature below the melting point of aluminum. 1. A method for producing an Al-based intermetallic compound wrought material, which comprises the steps of: performing a diffusion treatment on the processed product. (2) The method for producing an Al-based intermetallic compound wrought material according to claim 1, wherein the hot plastic working is carried out at a temperature of 350 to 600°C.