JPH04346A - Manufacture of aluminum alloy high damping material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention has excellent vibration damping properties and is used as a structural member that dislikes vibrations in audio equipment, precision equipment, automobiles, etc.
The present invention relates to a method of manufacturing N alloy vibration damping material.

[Conventional technology and its problems]

Generally, when an object is vibrated, the amplitude increases at a certain frequency (fr) (Figure 1). This frequency is called the resonant frequency. If the maximum amplitude at the resonance frequency is Ao, then the amplitude that is 1/2 of this energy is Ao /7
2 (-3 dB in dB).

If this frequency width (half width) is Δf, the loss coefficient η is expressed by the following equation.

η=Δf/f r A material with a large value of this loss coefficient η has excellent vibration damping ability, and when an external force is removed, vibrations are damped two times faster.

The loss coefficient η of ordinary metal materials is 0.001 or less.

Conventionally, metal materials for structural members that dislike vibration in audio equipment, precision equipment, automobiles, etc., so-called vibration damping materials, have been used.
Fe-Cr series, MnCu series, Zn-Ajl! system, Ni-
Alloys such as Ti-based alloys are known. Although these alloys have high vibration damping properties, they have a common drawback of high specific gravity, making them unsuitable when attempting to reduce the weight of equipment.

Furthermore, Mg and Mg-Zr based cast materials are also known as vibration damping materials, and have the advantage of exhibiting large vibration damping properties and low specific gravity, but have the drawback of not being able to be cold worked at all.

[Means for Solving the Problems] In view of this, and as a result of various studies, the present invention has developed a method for producing a vibration damping material mainly composed of Af, which has a low specific gravity and is easy to cold work.

That is, the method for producing an aluminum alloy vibration damping material according to claim 1 is such that an AN alloy material containing 0.05 to 10 wt% of P is
% or more, and the loss coefficient η is reduced to 0.
006 or more, and the method of manufacturing an aluminum alloy vibration damping material according to claim 2 is characterized in that P 0.006 or more.
Cu 0.2-8 wt%, Mg 0.2-7 wt%, Z
n 0.2-8 wt%, Si 0.2-2.5@t
%, Ni0.2-4.5wt%, Cr0.01-L, 0wt%, Zr 0.01-0 as the second element group
．． 25wt%, MnQ, 01-2.5wt%, Hf0.
Area reduction rate of 30% or more for Al alloy material containing one or more elements selected from one or both of the two element groups of 0.01 to 511 t% and V 0.01 to 0.35 wt%. The method of manufacturing an aluminum alloy vibration damping material according to claim 3 is characterized in that the material is subjected to plastic working to have a loss coefficient η of 0.006 or more.
Contains 0wt% and further contains Sn, Pb, In, Cd,
, Bi, and Sb in a total of 0.
It is characterized in that an A2 alloy material containing 1 to 5 wt% is subjected to plastic working with an area reduction rate of 30% or more, so that the loss coefficient η is 0.006 or more. Further, the method for producing an aluminum alloy vibration damping material according to claim 4 includes
t%, and further contains Sn, Pb, In5cct, Bi
, a total of 0.1 to 5 of one or two or more of Sb
wt%, and further contains Cu0.2~ as the first element group.
811t%, Mg0.2-7wt%, Zn0.2-8w
t%, S i 0.2-2.5 wt%, N i 0.
2 to 4.5 wt%, Cr0.01 as the second element group
~1.0wt%, Zr0. OI~0.25wt%, M
n0.01-2.5wt%, Hr0.0l-5wt%,
Plastic working is applied to an Al alloy material containing one or more elements selected from one or both of the two element groups of V0.01 to 0°35wt% with an area reduction rate of 30% or more. The present invention is characterized in that the loss coefficient η is set to 0.006 or more.

Here, the area reduction rate is a value expressed by the following formula from the cross-sectional area (So) of the material and the cross-sectional area (S) of the product in plastic working such as rolling and extrusion.

(Function) Damping materials are known to be of composite phase type, dislocation type, ferromagnetic type, and twin type depending on their vibration damping mechanism, but the vibration damping material to be manufactured by the method of the present invention is of composite phase type and dislocation type. This is an unprecedented type of material that combines the following elements: absorption of vibrational energy by viscous flow at the interface between the fine particles containing P distributed inside the material and the A! matrix (an element as a composite phase type); Due to the synergistic effect of absorption of vibration energy (element as a dislocation type) by repeated temporary fixation/detachment by fine particles containing P of dislocations introduced by plastic working, vibrations applied to the material can be absorbed extremely quickly. It is something that attenuates it.

Addition of P alone is sufficient to exhibit this effect, but in addition to this, Sn, Pb, In, Zn, Cd, Bi
, Sb, these also form fine particles of each phase, so vibration damping properties can be further improved. Also, Cu, Mg, Z
n, Si, and Ni form fine precipitates in the matrix to improve the strength of the material, and Cr, Zr, Mn,
Hf, ■ improves the workability and strength of the material by making the structure in the material fine.

Next, the manufacturing method and limited range of the present invention will be explained in more detail.

P is 0.05 to 0.05 to obtain the above-mentioned vibration damping effect.
It is added in a range of 10 wt%. If it is less than 0.05@t%, the effect is insufficient, and if it exceeds 10wt%, the effect is saturated, and disadvantages arise such as a low melting point phase is formed, resulting in a decrease in strength and toughness, and an increase in specific gravity. .

In order to further improve vibration damping properties, Sn, Pb, In
, Zn, Cd, Bi, and Sb in a total amount of 0.1 to 5 wt%. In this case, if the amount added is Q,l wt%t%, no particular effect of improving vibration damping properties is observed, and if it exceeds 5wt%, the effect is saturated and the corrosion resistance and strength are reduced.

In addition, Cu, Mg, Zn, Si, N
i, or Cr, Zr, Mn, HE, which improves the workability and strength of the material by making the structure in the material fine.
(2) is preferably added when the damping material product of the present invention is used in a member that requires strength. If each of these elements is below the lower limit, these effects will not be sufficient, and if the upper limit is exceeded, the workability and ductility of the material will decrease.

Note that Ti and B, which are usually added as refiners for the casting structure,
are preferably added in an amount of 0.25 wt% or less, respectively.

Also, like Fe, normal A! Unavoidable impurities contained in the base metal or other additive elements added to improve vibration damping properties such as strength and corrosion resistance are
If the amount is t% or less, the effects of the present invention will not be particularly impaired.

The Al alloy material containing the above-mentioned additive elements may be any ingot, plate, forged material, extruded material, or block made of solidified powder produced by a conventional method. Next, by applying plastic working to this Al alloy material with an area reduction rate of 30% or more, the vibration damping property becomes thicker (improved). In addition to the effect of absorbing vibration energy due to repeated temporary adhesion/detachment of fine particles, etc., fine particles such as P, which were coarse in the cast state, are divided and refined by plastic working and become spindle-shaped. Two effects are obtained: the vibration energy absorption effect due to the viscous flow at the interface between the particles and the Al matrix is more efficiently exerted, and the vibration damping property is greatly improved.For plastic working, hot working or Cold working or cold working after hot working may be performed, for example, rolling, extrusion, drawing, forging, etc. may be used. By setting the area reduction rate to 30% or more, the loss coefficient η can be reduced to 0. .006 or more.If the loss coefficient η is less than 0.006, the vibration damping property is insufficient, and the necessary characteristics as a vibration damping material cannot be obtained.The larger the amount of plastic working, the lower the loss. Although the loss factor is improved and a higher loss factor is obtained with cold working than with hot working, the area reduction from the raw material to the final product is 30%.
% or more, a loss coefficient η of 0.006 or more can be obtained regardless of hot or cold conditions, and sufficient vibration damping properties can be obtained as a vibration damping material.

Note that the effects of the present invention will not be impaired even if intermediate annealing, which is usually performed to adjust strength and elongation, is performed after hot working or during cold rolling.

Additionally, heat treatments such as temper annealing or aging treatment applied to the final processed product to adjust strength and elongation reduce the dislocations introduced by plastic working, resulting in a slight deterioration of vibration damping properties. Although there is a tendency, there is no particular problem if the temperature is 400°C or less and the time is about 24 hours or less.

〔Example〕

Examples will be described below.

Example 1 A2 alloy having the composition shown in Table 1 was melted and cast to a thickness of 11
The ingot was 00a+ and had a width of 250 cm. This was solidified (5 cm on each side), homogenized at 480°C for 10 hours, and then hot rolled (450°C) to a thickness of 18mm.
(The area reduction rate due to plastic working is approximately 80%).

A test piece with a thickness of 2 mm, a width of 10 m, and a length of 200 m+ was cut out from this, and the vibration damping property (loss coefficient η
) was evaluated. That is, one end of the test piece was chunked and forcibly vibrated with an oscillator, and the loss coefficient η at the resonance frequency fr was determined by equation (1). The results are also listed in Table 1.

η=Δf/f r...(1) However, Δf is 3
dB Value Width (Half Value Width) As is clear from Table 1, the material according to the present invention has a larger loss coefficient η than the comparative example, and exhibits excellent characteristics. Also, alloy No. Sample No. 9 had poor workability and cracked during production, making it impossible to produce.

Example 2 Powder was produced by atomizing the molten AI2 alloy having the alloy composition shown in Table 2, and the powder of 150 or less was classified, and this powder was used to create a billet with a diameter of 250 m using the can sealing and degassing method. did. This billet was hot extruded (450
°C) into bars of various sizes shown in Table 3. The loss coefficient η of these bars was determined in the same manner as in Example 1.
was measured. The results are shown in Table 3.

As is clear from the middle table, the holes A-D produced by the method of the present invention have a large loss coefficient η and have excellent vibration damping properties. On the other hand, Comparative Example N (LEF), which has a low area reduction rate, has a low loss coefficient η.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain an Al alloy vibration damping material that is lightweight, has excellent cold workability, and has excellent vibration damping properties because it contains AA as a main component. , which has a remarkable industrial effect.

[Brief explanation of drawings]

FIG. 1 is a vibration resonance curve diagram.

Claims (4)

[Claims] (1) Aluminum alloy vibration damping material characterized by plastic working an Al alloy material containing 0.05 to 10 wt% of P at an area reduction rate of 30% or more to achieve a loss coefficient η of 0.006 or more. manufacturing method. (2) Contains P0.05-10wt%, and further includes Cu0.2-8wt% and Mg0.2-7w as the first element group.
t%, Zn0.2-8wt%, Si0.2-2.5wt
%, Ni0.2-4.5wt%, as the second element group,
Cr0.01-1.0wt%, Zr0.01-0.25
wt%, Mn0.01~2.5wt%, Hf0.01~
Plasticity is applied to an Al alloy material containing one or more elements selected from one or both of the two element groups of 5wt% and V0.01 to 0.35wt% with an area reduction rate of 30% or more. A method for producing an aluminum alloy vibration damping material, which comprises processing the material to have a loss coefficient η of 0.006 or more. (3) Contains P0.05 to 10 wt%, and further contains Sn,
3 to an Al alloy material containing a total of 0.1 to 5 wt% of one or more of Pb, In, Cd, Bi, and Sb.
Plastic working is performed with an area reduction rate of 0% or more to reduce the loss coefficient η to 0.
．． 006 or more. (4) Contains P0.05 to 10 wt%, and further contains Sn,
Contains a total of 0.1 to 5 wt% of one or more of Pb, In, Cd, Bi, and Sb, and further includes Cu0.2 to 8 wt% and Mg0.2 to 7 wt% as the first element group.
%, Zn0.2-8wt%, Si0.2-2.5wt%
, Ni0.2-4.5wt%, C as the second element group
r0.01~1.0wt%, Zr0.01~0.25w
t%, Mn0.01-2.5wt%, Hf0.01-5
wt%, V0.01 to 0.35 wt% to an Al alloy material containing one or more elements selected from one or both of the two element groups with an area reduction of 30% or more. A method for producing an aluminum alloy vibration damping material, which comprises processing the material so that the loss coefficient η is 0.006 or more.