JPH04351A - Production 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] [Field of Industrial Application] The present invention is an aluminum alloy vibration damping material that has excellent vibration damping properties and is used as a structural member that dislikes vibrations in audio equipment, precision equipment, automobiles, etc. This relates to a manufacturing method.

[Prior art] - When an object is vibrated at JIQ, a certain frequency (fr)
The amplitude increases at (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.
/-1'2 (-3 dB in dB representation). If this frequency width (half width) is Δf, the loss coefficient η is expressed by the following equation.

η-Δf/fr A material with a large value of this loss coefficient η has excellent vibration damping properties, and vibrations are damped quickly when external force is removed.

The loss coefficient η of ordinary metal materials is less than or equal to o,ooi.

Conventionally, Fe-
Alloys such as Cr-based, Mn-Cu-based, Zn-Al-based, and Ni-Ti-based are known.

Furthermore, Mg and Mg-Zr based cast materials are also known as vibration damping materials.

[Problems to be solved by the invention] Fe-Cr system, Mn-Cu system, Zn-Al system, Ni-
Although alloys such as Ti-based 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. On the other hand, Mg and Mg-Zr based cast materials also exhibit great vibration damping properties and have the advantage of having a low specific gravity, but have the disadvantage that they cannot be cold worked at all.

[Means for Solving the Problems] In view of the above, and as a result of various studies, the present invention has developed a method for manufacturing an aluminum alloy vibration damping material that has a small specific gravity and is easy to cold work. The invention includes 0.1 to 15 wt% of Bi and Hf.

One or two or more of W and Mo in total of 0.
An aluminum alloy ingot containing 05 to 10 wt% and the remainder AN and unavoidable impurities 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. It is a manufacturing method of an aluminum alloy vibration damping material characterized in that the invention according to claim 2 is characterized in that sb is 0.
1 to 15 wt%, a total of 0.05 to lht% of one or more of Hf, W, and Mo, and the balance consists of Al and inevitable impurities, into an alloy ingot, 30% A method for producing an aluminum alloy vibration damping material, characterized in that plastic working is performed with the above area reduction rate so that the loss coefficient η becomes 0.006 or more, Contains 0.1-15wt%, H
An aluminum alloy ingot containing one or more of f, W, and Mo in a total amount of 0.05 to 10 wt% and the remainder Aj2 and unavoidable impurities is subjected to plastic working with an area reduction rate of 30% or more. This is a method for producing an aluminum alloy vibration damping material, 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 equation 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.

S.

[Effect]

Damping materials are classified into dislocation type, composite phase type, ferromagnetic type, and twin type depending on their vibration damping mechanism, and the vibration damping material according to the present invention is a material having both elements of composite phase type and dislocation type.

When Bi, Sb or Ge is added to Al, it becomes Bi.

sb or Ge particles or their compounds are uniformly distributed in the aluminum matrix. When vibration is applied to such a material, the vibration energy is quickly absorbed by viscous flow at the interface between the Bi, Sb or Ge particles/compound phase and the matrix, resulting in extremely high vibration damping properties (composite phase type). effect). In addition, dislocations introduced by plastic working can stick to low melting point metal particles/compounds.
As the separation is repeated, vibrational energy is absorbed,
High vibration damping properties can be obtained (effect as a transposed type). In this way, extremely high vibration damping performance can be obtained due to the synergistic effect of the two types of vibration damping mechanisms, the composite phase type and the dislocation type. Although the addition of Bi, Sb, or Ge alone is sufficient to exhibit such effects, the vibration damping properties are further improved by further adding Hf, W, Mo, or the like.

As mentioned above, Bi, Sb, or Ge is added to improve vibration damping properties, and the content of Bi, Sb, or Ge is limited to 0.1 to 15 wt%.
Bi, Sb distributed in the matrix at less than 1 wt%
Alternatively, the amount of Ge particles/compounds formed is small and the vibration damping effect is insufficient. If it exceeds 15 wt%, the effect will be saturated, and the distribution of Bi, Sb or Ge particles/compounds will become uneven, resulting in variations in vibration damping properties. This is because mechanical properties, corrosion resistance, etc. may deteriorate. Other elements that exhibit this effect include H.
g, Se, T/! Even if these elements are added, the vibration damping property is not impaired, and one or more of Hf, W, and Mo are added in total from 0.05 to 100 lbt.
%, because if it is less than 0.05 wt%, the amount of intermetallic compounds formed is small and the vibration damping ability improvement effect is insufficient, and if it exceeds 10 wt%, the effect is saturated and the plastic workability deteriorates. It's for a reason.

Note that Ti and B, which are usually added as refiners for the casting structure,
is preferably added in a range of 0.05 wt%. Also, regular A! such as Si and Fe! The impurities contained in the metal are 0.
If it is 5 wt% or less, the effects of the present invention will not be impaired.

The A/2 alloy with the above composition is melted by the usual method.
Cast and homogenize as necessary.

The Al alloy ingot in this state has slightly better vibration damping properties than normal AN ingots, but it is a zero-order Al alloy that is insufficient to be used as a vibration damping material. By applying plastic working to the ingot with an area reduction rate of 30% or more, vibration damping properties are greatly improved. That is, by adding plastic working, the dislocation density increases, and as mentioned above, dislocations such as Bi particles and
In addition to exhibiting the effect of absorbing vibration energy through repeated temporary adhesion/detachment to the compound, the Bi, Sb, or Ge particles/compounds, which were coarse in the casting state, are fragmented and refined by plastic working, and the Bi The vibration energy absorption effect due to the viscous flow between the particles/compounds of Sb or Ge and the matrix is more efficiently exhibited, and vibration damping properties are improved. Plastic working may be carried out by hot working, cold working, or cold working after hot working, and may be performed by any means such as rolling, extrusion, drawing, or forging, but the area reduction must be 30% or more. , loss coefficient η is 0.0
Make sure it is 06 or higher. If the loss coefficient η is less than 0.006, the vibration damping property is insufficient and the necessary properties as a vibration damping material cannot be obtained.The larger the amount of plastic working, the higher the loss coefficient. A higher loss coefficient can be obtained with cold working, but if the area reduction from the ingot to the final processed product is 30% or more, the loss coefficient η is 0.006 regardless of hot or cold working. As a result, sufficient vibration damping properties can be obtained as a vibration damping material.

In addition, annealing is commonly performed to adjust strength and elongation.
Even if it is applied after hot working or during cold working, the effects of the present invention will not be impaired. Similarly, temper annealing, which is applied to the final processed product to adjust strength and elongation, tends to deteriorate vibration damping properties because it reduces dislocations introduced by plastic working, but There is no particular problem if it is kept at the following temperature for about 24 hours.

〔Example] Next, the present invention will be explained in more detail with reference to Examples.

Example 1 An AI1 alloy having the composition shown in Table 1 was melted and cast to a thickness of 5.
The ingot was 0ffII11, width 120m+, and length 300m.

This was subjected to homogenization treatment at 500° C. for 10 hours, and then hot rolled and cold rolled to form a plate material with a thickness of 5 m. A test piece with a thickness of 2III+, a thickness of 10 mm, and a length of 250 mm was cut out from this, and its vibration damping property (tjl loss coefficient η) was evaluated by the cantilever vibration method.

That is, one end of the test piece is chunked and an oscillator is used to forcibly apply random vibrations, and the vibrations of the test piece are detected. The input-output amplitude ratio in the frequency domain of this input vibration and detected (output) vibration is determined by a two-channel fast Fourier transform (FFT).

The resonance frequency (fr) showing the maximum amplitude ratio and the frequency width (Δf) that is 3 dB lower than the maximum amplitude ratio were measured, and the loss coefficient η was determined by the following equation.

η=Δf/fr The value of this loss coefficient η is also listed in Table 1.

From the first bar, the thickness is 2m, the width is 10m, and the length is 25mm, as in Example 1.
A 0 m test piece was cut out, and the vibration damping property (loss coefficient η) was evaluated using the cantilever beam vibration method. The results are also listed in Table 2.

As is clear from Table 2 and Table 1, No.
, 1 to 5 indicate a high loss coefficient η.

On the other hand, the loss coefficient η was low in the case 6, which is outside the manufacturing method of the present invention, and the plastic working could not be performed on the cases 7 and 8.

Example 2 An A2 alloy having the composition shown in Table 1, No. 2 was melted and cast to form an ingot with a diameter of 300III and a length of 400W (7).
Homogenization treatment was carried out at 'C for 10 hours. This was extruded into a round bar having the diameter shown in Table 2. As is clear from this pressing brush 2 table, Nos. 11 to 14 according to the present invention
has a large loss coefficient η and excellent vibration damping properties. On the other hand, the comparative method Nα15, which has a low area reduction rate, has a low loss coefficient η.

Example 3 A! of the composition shown in Table 3! Gold alloy melted and cast, thickness 50
III [111] An ingot with a width of 120 on and a length of 300 mm was made.

This was subjected to homogenization treatment at 500°C for 10 hours, and then hot rolled and cold rolled to produce a plate material with a thickness of 5 mm. From this, thickness 2III, width l0III11, length 250m + (
7) A test piece was cut out, and the vibration damping property (loss coefficient η) was evaluated by the cantilever vibration method in the same manner as in Example 1. The results are also listed in Table 3.

Table 3 The Nct was low and plastic working could not be performed at Nct 27.28.

Example 4 An Al alloy having the composition shown in Table 3, No. 22, was melted and cast to form an ingot with a diameter of 300 m and a length of 400 m, and was heated at 500°C for 1 hour.
Homogenization treatment was performed for 0 hours. This was extruded into a round bar having the diameter shown in Table 4. From this extruded rod, as in Example 3, the thickness was 21al11, the width was 10mm, and the length was 250m.
A test piece was cut out, and the vibration damping properties (
The loss coefficient η) was evaluated. The results are also listed in Table 4.

As is clear from Table 4 and Table 3, the production method of the present invention
1 to 25 indicate a high loss coefficient η.

On the other hand, the loss coefficient η of the sewage 26 that deviates from the manufacturing method of the present invention is the fourth.
As is clear from the table, Nα31 to Nα34 according to the present invention have a large loss coefficient η and have excellent vibration damping properties. On the other hand, Comparative Law 35, which has a low area reduction rate, has a low loss coefficient η.

Example 5 An alloy having the composition shown in Table 5 was melted and cast to a thickness of 50 m.
, an ingot with a width of 120+m+ and a length of 300m. This was homogenized in soo'c for 10 hours, hot rolled,
It was made into a plate with a thickness of 5 mm by cold rolling. Thickness 2 from this
Peng, width 101II! A test piece with a length of 250 m was cut out, and vibration damping properties (
The loss coefficient η) was evaluated. The results are also listed in Table 5.

Table 5 As is clear from Table 5, Nα obtained by the production method of the present invention
41 to 45 indicate high loss coefficient η.

On the other hand, Ryu 46, which does not comply with the manufacturing method of the present invention, had a low loss coefficient η, and N1147.48 could not be subjected to plastic working.

Example 6 An Af gold alloy having the composition shown in NCL42 in Table 5 was melted and cast to form an ingot with a diameter of 300IIIffl and a length of 400 m,
Homogenization treatment was performed at 500° C. for 10 hours. This is the fifth
Extrusion was performed on a round bar with the diameter shown in the table. From this extruded rod, as in Example 5, the thickness was 2IaI11 and the radius was 1OIaI.
11. A test piece with a length of 250 m was cut out, and the vibration damping property (loss coefficient η) was evaluated using the cantilever beam vibration method. The results are also listed in Table 6.

Table 6 Aluminum alloy vibration damping materials having excellent vibration damping properties can be obtained and have remarkable industrial effects.

[Brief explanation of the drawing]

Figure 1 is a resonance curve diagram of vibration. Patent Applicant: Furukawa Aluminum Industry Co., Ltd. As is clear from Table 6, Samples Nos. 51 to 54 according to the present invention have a large loss coefficient η and have excellent vibration damping properties. On the other hand,
Comparative method No. 55, which has a low area reduction rate, has a low loss coefficient η. 〔Effect of the invention〕

Claims (3)

[Claims] (1) Contains 0.1 to 15 wt% Bi, Hf, W, M
One or more types from o in total of 0.05~
An aluminum alloy ingot containing 10 wt% with the remainder being Al and unavoidable impurities 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. A method for manufacturing an aluminum alloy vibration damping material. (2) Contains 0.1 to 15 wt% of Sb, Hf, W, M
One or more types from o in total of 0.05~
The alloy ingot is made of aluminum containing 10 wt% and the balance is Al and unavoidable impurities, and is subjected to plastic working with an area reduction rate of 30% or more so that the loss coefficient η becomes 0.006 or more. A method for manufacturing an aluminum alloy vibration damping material. (3) Contains 0.1 to 15 wt% of Ge, Hf, W, M
One or more types from o in total of 0.05~
An aluminum alloy ingot containing 10 wt% with the remainder being Al and unavoidable impurities 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. A method for manufacturing an aluminum alloy vibration damping material.