JPS59123733A - Structural aluminum alloy with improved electric resistance - Google Patents

Abstract

PURPOSE:To improve the electric resistance and tensile strength by using prescribed percentages of Ag, Ti, Cr, Zr, V, W, Al and Mn. CONSTITUTION:The titled alloy consists of, by weight, 5-50% Ag, one or more among 0.05-0.2% Ti, 0.05-0.4% Cr, 0.05-0.3% Zr, 0.05-0.35% V and 0.05- 0.3% W, and the balance Al. The alloy may further contain <=2% Mn. The alloy has high electric resistance and strength, and it is suitable for use as a structural material for a site where a strong magnetic field is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structural Al (aluminum) alloy with improved electrical resistance properties.

Conventional A4 alloy is known as an alloy with low electrical resistance, that is, good electrical conductivity, and has been used for electric wire materials, etc. However, recently, the use of A7 material has expanded, and A4 alloy with high electrical resistance has been used. Materials are now in demand.

This new application includes structural materials for linear motor cars, nuclear fusion reactors, etc., and strong magnetic fields will act on such structural materials.

Incidentally, when A7 material is used in a strong magnetic field, an induced current is generated, and the magnitude of this induced current increases in proportion to the electrical conductivity of the material. For example, when applying a magnetic field H uniformly in the central axis direction of a sufficiently long fixed cylindrical conductor with magnetic permeability μ and conductivity σ, and increasing the magnetic field H at a speed of dH/d, t, It is known that the direction of the current density J generated in the conductor is the circumferential direction, and its magnitude is given by the following equation. However, r is the radius of the cylinder.

By the way, this induced current is subjected to electromagnetic force by an external magnetic field according to Fleming's left-hand rule, so a large force acts on the material itself. Therefore, in order to reduce this force, an A1 alloy with as high electrical resistance as possible is required.

In this regard, the present inventors have conducted various studies in view of the above circumstances, and have found that by devising various alloy components, the electrical resistance can be increased, especially the electrical resistance value is 5.7 μΩ or more, and the structure A with high tensile strength required for materials for
They discovered that one alloy can be obtained, and arrived at the present invention.

That is, the main object of the present invention is to provide a structural material alloy with increased electrical resistance.

Another object of the present invention is to provide a structural material made of an Ad-gold alloy that has high electrical resistance and high material strength, particularly a structural material that can be suitably used in places where a strong magnetic field acts.

- In order to achieve this object, the present invention first contains 5 to 50% Ag (silver) by weight, and 0.05 to 0.20% Ti (ditane), 0. .05
~0.40% Cr (chromium), 005~0.80% Zr (zirconium), 0.05~0.35% ■ (vanadium) and 0.05~0.30% W (tungsten) One or more selected from the group consisting of, and 0
The alloy components were prepared so that it contained ~20% Mn (manganese), with the remainder consisting of Al and unavoidable impurities.

In addition, in the present invention, by further adding a specific amount of O (copper) to the alloy composition, its properties can be further improved. That is, the present invention has a weight of 5 to 50
% Ag and 1-7% Cu, and 0.05-0
．． 20%'ri, 0.05~0.40%ノOr,
0.05-0.30% (7) Zr, 0.05-0
．． One or more selected from the group consisting of 35% V and 0.05-0.80% W, and 0-2.0% Mn.
It is also characterized by an A/gold alloy with an alloy composition containing A5 and unavoidable impurities, which further improves electrical resistance properties and tensile strength, especially when the electrical resistance value is 5.7 μΩ or more. , and tensile strength: σ9 is 50k
An alloy material with excellent performance exceeding g/mA was obtained.

Here, Ag, which is an alloy component mixed with Al according to the present invention, is an essential component for increasing strength and electrical resistance performance, and in order to fully exhibit its addition effect, it must be at least 5% (by weight). It is necessary to contain it in the A1 alloy in a proportion equal to or higher than the standard (the same applies hereinafter). In addition, Ag
If the content is too small, the strength will decrease and the desired electrical resistance properties will not be sufficiently improved. Also, A
If the content of
Since g-based compounds tend to precipitate at grain boundaries, which may lead to a decrease in toughness and cause problems such as difficulty in rolling, the upper limit should be 50%. . Note that such Ag is preferably 10% to 40%.
%, thereby achieving an effective improvement in the electrical resistance properties and strength of the alloy.

In addition, other alloy components such as Ti, Or, and Zr.

(2) and W are both elements that increase electrical resistance and refine crystal grains, and refine the structure of the ingot obtained by casting from the molten metal having the A1 alloy composition according to the present invention, making it possible to improve the structure of structural materials. However, if these elements are present in too much, they form intermetallic compounds with Al and cause them to crystallize.
005 to 0 in TI because it has a negative effect on toughness.
20%, Or 0.05-0.40%, Z r Te 0.05-0.30%, ■ 0.05-0.35%,
W is contained in a proportion of 0.05 to 0.30%. Note that these five types of elements may be used alone or in combination of two or more thereof.

Furthermore, like the above-mentioned elements such as Ti and Or, Mn makes the electrical resistance value uniform, and also makes the crystal grains finer.
It can increase strength; generally 0 to 2.0%, preferably 0.0%. It will be contained at a ratio of ~1.5%. Containing a large amount of Kn also has a negative effect on toughness.

Note that when the A1 alloy according to the present invention is used as a structural material where residual radioactivity is a problem, such as a reactor material for a nuclear fusion reactor, the addition of Mn is omitted. However, the effect of Mn on residual radioactivity is that when 1% Mn is added to the Ad alloy, the dose rate after DT discharge is 10' mrem/hr after 1 year, and after 5 years. This is because even if it is, it is only reduced to about 1/10.

Further, Cu, which is further added to such an alloy composition, is an effective element for increasing the strength and electrical resistance properties of the formed alloy in the presence of Ag, and in achieving the object of the present invention, It will be added in a content range of 1 to 7%, preferably 2 to 5%. In addition, Cu
If the content is too small, a sufficient effect of adding Cu can be expected, and if the amount added is too large, processing such as rolling or extrusion becomes difficult. Particularly, when Cu is added at such a content ratio and the Ag content is 10% or more, it has an electrical resistance value of 5.7 μΩ or more and a tensile strength (σB) of 50 kg/- or more. A/gold alloy can advantageously be obtained.

The A/alloy according to the present invention having such alloy components and composition ranges is produced by first preparing a molten metal of the A1 alloy, and then using the molten metal to form structural materials used for various purposes. A predetermined alloy ingot is cast according to a known normal method, and then the obtained ingot is subjected to heat treatment, so-called homogenization treatment (soaking), to homogenize the solidification structure (alloy component), and then Thereafter, the material is hot-rolled and cold-rolled according to conventional methods, and if necessary, subjected to post-treatments such as solution treatment and aging treatment to form a structural material for the intended use. The processing conditions for the ingot made of A4 alloy according to the present invention are generally appropriately selected within the range of processing conditions for normal Al materials. For example, in soaking treatment, A temperature condition of 550°C was adopted,
Hot rolling is at 300-400°C1, solution treatment is at 400-550°C1, and high-temperature aging treatment is at 100-200°C.
It will be carried out at 0°C.

The A7 alloy material obtained in this way has an electrical resistance value that is significantly higher than that of conventional materials, and in particular, by selecting the alloy components and their contents according to the present invention, it is possible to achieve an electrical resistance value of 57 μΩ or more. It can be obtained advantageously, and also has tensile strength: σ3 of 30 kg/- or more, and furthermore, 50 kg/- or more, which makes it suitable for linear motor cars used in strong magnetic fields. The alloy composition according to the present invention can now be advantageously used as a structural material for nuclear fusion reactors and nuclear fusion reactors. In particular, in the case of the A4 alloy according to the present invention, which does not contain Mn, in addition to the effect of increasing electrical resistance, there is also a low activation effect, that is, a reduction in the level of residual radioactivity imparted to the material by irradiation with neutrons generated in DT nuclear combustion. Since it has such effects, it can be advantageously used as a structural material for vacuum vessels, coil frames, etc. in such nuclear fusion reactors.

1. In order to clarify the present invention more specifically,
Although some examples of the present invention will be described, it goes without saying that the present invention is not limited in any way by the description of these examples.

Example 1 A molten Aβ-Ag(-〇+1) alloy having the alloy composition shown in Table 1 below was ingot-formed by a continuous casting method, and various ingots were cast. Thereafter, the various ingots were soaked at 450° C. under humidity, hot rolled at 380° C., and then cold rolled to a thickness of 2 mm.

Samples for electrical resistance and tensile tests were cut from the cold-rolled plate thus obtained, subjected to solution treatment at about 500°C, and then high-temperature aging treatment at 100 to 200°C.

The electrical resistance and tensile strength characteristics of the samples of various alloy compositions obtained in this way were investigated.
The results are shown in Table 2 along with the evaluation of castability and workability. The electrical resistance properties were determined by the lAC30 value indicating electrical conductivity according to ASTM-B-193, and the tensile strength was determined by the measuring method of JIS-Z-2241 using a JIS No. 4 test piece. The I ACS value indicates that the smaller the value, the higher the electrical resistance, and when it is 30%, it corresponds to an electrical resistance of 5.7 μΩ mark.

In addition, the residual radioactivity evaluation in Table 2 is performed based on the residual radioactivity level one month after the D-T reaction. (l Q ” mrem /hr) and Δ
The mark indicates a level that requires some consideration (lQ'~
l Q-2 mrem/hr), and the mark X indicates the level at which humans cannot come close to structural materials made of the alloy, such as the vacuum vessels of nuclear fusion reactors (> 10 mrem/hr).
) are shown respectively.

As is clear from the results in Table 2 below, all Ad gold alloys in the alloy composition range according to the present invention have a low IA (, S value, in other words, a high electrical resistance value, and a tensile strength that is useful as a structural material. It exhibited extremely high values, and in particular, due to the presence of predetermined amounts of Ag and Cu, it was possible to exhibit an electrical resistance value of 57 μΩ or more and a tensile strength of 50 kg/mff1 or more.

Chapter 1 Table

Claims (1)

[Claims] (1) Contains 5 to 50% Ag by weight and contains 005
~0.20% Ti, 0.05~0.40% Cr\
0.05-0.30% Zr, 0.05-0.35
% V and 0.05 to 0.30% W, the remainder being Aβ and unavoidable impurities, and has increased electrical resistance. (2) The aluminum alloy according to claim 1, wherein the Ag content is 10% or more. (3) Contains 5 to 50% Ag by weight and 0.0
5-0.20% Ti, o, o5-0.40% Or
, 0.05~o, go%ノZr, 0.05~
Contains one or more selected from the group consisting of 0.35% V and 0.05 to 0.30% W, and up to 2.0% Mn, with the remainder being AI and unavoidable Structural aluminum alloy with impurities and increased electrical resistance. (4) The aluminum alloy according to claim 3, wherein the Ag content is 10% or more. (5) The aluminum alloy according to claim 3 or 4, wherein the content of the Δ(n) is 0.05 to 1.5%. (6) 5 to 50% Ag by weight and 1-7% Cu
and 0.05-020% T110°05-0
．． 40% Cr, 0.05-0.30% Zr
, 0.05-0.35% V and 0.05-0.
A structural aluminum alloy with increased electrical resistance, containing 30% of one or more selected from the group consisting of W, with the remainder consisting of A4 and unavoidable impurities. (7) The aluminum alloy according to claim 6, wherein the Ag content is 10% or more. (8) 5-50% Ag and 1-7% Cu by weight
and -) 0.05-0.20% Ti. 0.05-0.40% CR, o, o 5-0.3
1 selected from the group consisting of 0% z r' + 0.05-0.35% V and 0.05-0, SO% W
A structural aluminum alloy with increased electrical resistance, containing one or more species and up to 2.0% Mn, with the remainder consisting of A5 and unavoidable impurities. (9) The aluminum alloy according to claim 8, wherein the Ag content is 10% or more. (10 The aluminum alloy according to claim 9, having an electrical resistance value of 5.7 μΩ or more and a tensile strength σB of 50 kg/mt or more. αυ The Mn content is 0.05 ~15% of the aluminum alloy according to any one of claims @8 to 10.