JPH0711359A - Production of foil of ceramic whisker and particle reinforced aluminum alloy composite material - Google Patents

Abstract

PURPOSE:To provide the foil of the aluminum alloy composite material specified in thickness by high-speed superplastic rolling. CONSTITUTION:The composite material formed by pressurizing and sintering aluminum alloy powder of 2000 to 8000 series contg. particles of silicon carbide, titanium carbide particles, silicon nitride, aluminum nitride, titanium nitride and titanium boride having <=45mum grain size at 0.10 to 0.30 volumetric content in a vacuum hot press is subjected to extrusion working at >=10 extrusion ratio at 450 to 600 deg.C and is further subjected to a repetition of rolling at about 0.1 strain quantity and at 450 to 600'C and >=5 minutes of heating, by which the sheet-like composite material 1 having >=0.1mm thickness is formed. Two sheets each of such composite materials are held between thin stainless steel sheets 2 and are superposed in a lamination form, The laminated materials are then packed into a stainless steel pipe 3 and are repetitively subjected to the rolling at about 0.1 strain quantity and at 450 to 600 deg.C and the heating. As a result, the foil 1 of the ceramic whisker and particle reinforced aluminum alloy composite material having <=200mum thickness is obtd.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an aluminum alloy containing whiskers and particles of ceramics such as silicon carbide, titanium carbide, silicon nitride, aluminum nitride, titanium nitride and titanium boride as a reinforcing material, and high speed superplastic rolling. The present invention relates to a method for manufacturing a composite metal material of foil having a thickness of 10 μm to 200 μm manufactured by a processing method.

[0002]

2. Description of the Related Art Ceramic whiskers or particle reinforced aluminum composite materials have a specific modulus of about 2 that of conventional metal materials.
The strength is twice as high as that of titanium alloy, and it has excellent heat resistance, wear resistance, thermal dimensional stability, and thermal conductivity. Is being applied to structures. Further, it is also expected to be applied to packages of electronic devices such as semiconductors.

In recent years, it has been found that ceramic whiskers and particle-reinforced aluminum composite materials develop superplasticity at a high strain rate of about 0.1 per second. In addition, by the efficient near net shape molding that utilizes this high-speed superplasticity phenomenon, in the aerospace field, etc., the establishment of a technology that can produce a three-dimensional structure with a complicated surface shape and a large surface area with high efficiency has been established. It has become possible.

However, the conventionally developed superplastic ceramic whiskers or particle-reinforced aluminum composite materials have high material prices and manufacturing costs, and there are not many practical examples in the consumer field such as automobiles. In order to put them into practical use, it is necessary to aim to create high value-added products and materials made from these composite materials.

[Problems to be Solved by the Invention]

In recent years, interest in metal foils has increased in various fields including semiconductors. For example, in addition to decorations, many practical applications of semiconductor lead wires, surface heating elements, damping materials, speaker diaphragm seat materials, high-pressure gas valves, spring materials, X-ray extraction window materials, metal foils such as capacitors. Examples have been reported.
Therefore, if a foil of a ceramic whisker or a particle-reinforced aluminum alloy composite material can be manufactured, it can be used in the field of the above-mentioned foil, and its practical application in the consumer field is expected to expand.

[Means for Solving the Problems]

The ceramic whisker (particle) reinforced aluminum alloy composite material has low ductility and fracture toughness, and it is considerably difficult not only to roll it at room temperature but also to process it to 200 μm or less. However, since superplasticity develops at a high strain rate near the solid phase temperature of the aluminum matrix,
It is considered possible to manufacture a foil-like composite material by superplastic rolling. In addition, conventionally, metal such as aluminum and stainless steel has a multi-stage rolling mill with 4 to 6 or more rolls at room temperature.
A foil having a thickness of 00 μm or less is produced. Therefore, the inventors considered manufacturing a foil by a method of stacking a composite material in multiple stages in high-speed superplastic rolling, which is a combination of hot extrusion and hot rolling, for which a patent is being applied.

In order to enable superplastic rolling, the crystal grain size of the matrix of the composite material is as fine as about 3 μm, and sliding deformation occurs at the interface between the reinforcing material and the aluminum matrix at the superplasticity temperature. That is.
In order to form a microstructure capable of developing superplasticity in a composite material, hot extrusion and rolling are performed. In this case, in order to hot-roll the composite material with a cold rolling mill, the composite material is sandwiched between a stainless pipe and a plate, heated to a temperature at which superplasticity is developed, and rolled through stainless steel in contact with a roll. To maintain the temperature of the composite material.

In order to produce a composite material foil, it is necessary to carry out rolling at a high strain rate. To perform rolling at a high strain rate, a diameter of 100 mm rotating at 10 m / min
If the rolling strain amount is reduced to 0.1 or less using the roll No. 1, the composite material can be rolled at a strain rate of about 0.1 per second. As shown in FIG. 1, a composite material rolled to about 1 mm or less is sandwiched between stainless steel plates, and the stacked products are further packed in a stainless steel tube, which is then heated at a temperature (450 ° C. to 630 ° C.) at which superplasticity is exhibited. During heating), the material is rolled and heated to a thickness of 200 μm or less by repeating rolling and heating. At this time, the rolling amount for each pass is 0.1 or less. Two-high rolling mill, or 4
It is possible to produce foil by using a multi-roll mill.

EXAMPLES Examples of the present invention will be described below.

Example 1 A 6061 aluminum alloy powder having an average particle size of 45 μm or less contained titanium carbide TiC particles in a volume content of 0.
15 and mixed to prepare a rod-shaped TiC particle-reinforced 6061 aluminum composite material having a diameter of 40 mm by powder metallurgy. On the other hand, extrusion processing is performed at 500 ° C and an extrusion ratio of 44 to form a 6 mm wire rod.
It is wrapped in a stainless steel plate and tube, heated to a temperature of 560 ° C., and rolled many times with a small rolling reduction with a strain amount of about 0.1 or less. By repeating this heating-rolling, a superplastic plate-like composite material having a thickness of about 1 mm is produced. After that, a lubricant is applied to the plate-shaped superplastic composite material having a length of about 40 mm, and two sheets are sandwiched between two stainless steel plates having a length of 130 mm to form a laminated rolling material. These are diameter 58mm thickness 1.5mm length 130m
It was packed in a stainless steel tube of m, was repeatedly rolled and heated at a strain amount of 0.1 or less at 560 ° C., and was rolled until the thickness became 200 μm or less.
A composite material with a thickness of μm was produced.

Example 2 As in Example 1, 2014 with an average particle size of 45 μm or less
Aluminum alloy powder and TiC particles were mixed so that the volume content was 0.15, and the composite material produced by the powder metallurgy method was extruded and then rolled to obtain a composite material having a thickness of 2
Heating-rolling is repeated until it becomes less than 00 μm. As a result, 150 μm and 200 μm foils could be manufactured.

[0011]

EFFECT OF THE INVENTION 150-2 produced by the method described above
Tensile tests were conducted from room temperature to 400 ° C. to investigate the mechanical properties of foil-like composite materials with a thickness of 00 μm or less. FIG. 2 shows the tensile strength of the foils of TiC / 6061 and TiC / 2014 aluminum alloy composite material. TiC / 201
It was found that the 4Al composite material had a tensile strength of 440 PMa at room temperature and the TiC / 6061Al composite material had a tensile strength of 300 MPa. TiC / 2014
The Al composite material has strength not inferior to that of the stainless steel foil and can be practically used.

FIG. 3 also shows the superplastic properties of the TiC / 2014Al composite material. The test temperature is 545 ° C. Ti
C / 2014 Al composite material is about 2 at a strain rate of 0.5 S ^-1.
It was found to produce a total elongation of 00%. This indicates that the foil composite material can be formed into a complicated shape.

By processing into a foil, it is expected that this composite material will be used for semiconductor substrates, packages and the like and parts for micromachines and the like. It is also possible to fabricate a long-fiber composite material in which the matrix exhibits superplasticity by stacking a foil-shaped composite material with ceramic long fibers and pressing with hot pressing, which is complicated by superplastic forming for a long-fiber reinforced composite material. It can be expected to manufacture shaped long fiber composite material aircraft parts and structures.

[Brief description of drawings]

FIG. 1 shows a thin plate-like composite material of about 1 mm or less about 1.5 mm.
The following shows a material for rolling, which is sandwiched between two stainless steel plates, and several stainless steel tubes are stacked.

FIG. 2 shows the tensile strength of TiC / 6061 and TiC / 2014Al composites.

FIG. 3 shows the relationship between total elongation and strain rate at 545 ° C. of TiC / 2014Al composite material.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C22F 1/04 A

Claims (2)

[Claims] 1. A ceramic carbide (silicon carbide, titanium carbide) or nitride (silicon nitride, having a grain size of 45 μm or less).
Aluminum nitride, titanium nitride), boride (titanium boride) and 2000 series, 6000 series with a particle size of 45 μm or less,
The volume content of ceramics of 5000 series, 7000 series and 8000 series aluminum alloy powder is from 0.10 to 0.1.
The powder was mixed uniformly so as to be 30 and pressure-sintered in a vacuum hot press.
Extrusion is performed at a temperature of 50 ° C to 600 ° C with an extrusion ratio of 10 or more. The composite material billet is sandwiched between a stainless tube and a plate and heated to a temperature of 450 ° C to 600 ° C.
Rolling with a strain amount of 0.1 or less per pass and heating and holding at a rolling temperature for 5 minutes or more are repeated to form a plate-shaped composite material of about 1 mm. A foil of a composite material and a method for manufacturing the same, in which two foils each sandwiched between the foils are stacked, and rolling and heating are repeated under the same conditions as described above to form a foil having a thickness of 200 μm or less. 2. A silicon carbide (SiC) whisker, a silicon nitride (Si ₃ N ₄ ) whisker preform and 2000
System, 6000 system, 5000 system, 7000 system and 8000 system
A foil of a ceramic whisker reinforced aluminum alloy composite material (composite material having a thickness of 200 μm or less) obtained by subjecting a composite material produced by a molten metal forging method using a system aluminum alloy to the extrusion and rolling under the same conditions as in claim 1. And its manufacturing method