JPS62158032A - Al-mg-zn base alloy ply metal having high strength and excellent bending workability - 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 Application Field] The present invention provides an AI Kg-Z material with high strength and excellent bending workability.
This invention relates to an n-based alloy laminate.

[Prior art] Conventionally, Mg has been used as an aluminum alloy for forming.
．． Al-Mg-Zn-based alloys containing 5-7 wt% of ZnO and 5-2.0 wt% of ZnO have been put into practical use.

However, although these aluminum alloys have excellent formability (stretchability) in relation to their strength, the inner bending radius for 180° bending is only 0.7 at best.
It is 5t.

Recently, aluminum alloys have become more popular due to their light weight.
It has been used for various parts of automobiles, but 1.
- Panels that hold together the cord are often processed to fix the outer and inner parts in order to increase their rigidity. At this time, bending the outer material by 80° often causes cracks to occur, resulting in a decrease in caulking strength, small shape freezing, and unsightly appearance, resulting in concerns about long-term durability, which often results in not being used. . moreover,
Strength level comparable to mild steel plate (σ = 30 kg/mm
There is a growing demand for aluminum alloys that can be bent and bent.

[Problem to be solved by the invention 1 The present invention was made in view of the problems of conventional aluminum alloys as explained above, and as a result of repeated research by the present inventor, the strength is comparable to that of mild steel sheets. to the same extent,
In addition, they developed an Al-Mg-Zn alloy laminate that has an inner bending radius of O1, that is, can be bent 180° in close contact.

[Means for solving the problems] Al-Mg- with high strength and excellent bending workability according to the present invention
The characteristics of the Zn-based alloy laminate are that Mg 3-1
0 wt%, ZnO, 3 to 2.0 wt%, and Cu2. Ou+L%, Mn 0.8u+L% or less, C
r O, 5u+L% or more, Fe O, 5wL% or less, Si
0.5 wt% or less, Ni O, 5 wL% or less, Co
005u+L% or less, Mitsushi Metal (M, M) 0.5wL% or less, Zr
0.4u+L% or less, V 0.3wt% or less, Nb0.
31% or less, TiO63wt% or less, B, 0.06u
The core material is an aluminum alloy containing one or more selected from +L%, and the impurity alone is 0.1 ust% or less, and the balance is Al.
l An aluminum skin material with a purity of 99.0 wt% or more,
In addition, the thickness of the skin material is 5 to 20% of the total board thickness on one side, and the skin material is coated on one or both sides of the core material.

Al-Mg with high strength and excellent bending workability according to the present invention
The Zn-based alloy laminate will be described in detail below.

First, AlM with high strength and excellent bending workability according to the present invention
The core material and skin material of the g-Zn-based alloy laminate will be explained.

(1) Regarding the core material.

The core material is an aluminum alloy containing 3 to 10 uIt% of Mg.

Lambda is an element that improves strength, and its content is 3u+L
If the content is less than 10 wt %, the strength will be low, and if the content exceeds 10 wt %, Mg will be oxidized during melting, and rollability and bending workability will be reduced. Therefore, the Mg content is 3
~10wt%.

Although Zn improves strength and bending workability, it reduces rollability, and if the content is less than 0.3 wt%, the improvement in strength is small, and if the content exceeds 2 wt%, the rollability is reduced. The Zn content is 0.3 to 2.0 wt%.

Although Cu has the effect of improving strength, it reduces bending workability and rollability, and if the content is 2. If the content exceeds OwL%, the rollability will be significantly reduced. Therefore, material 1 with good rolling properties? Sexual tone (CLI content is 2.0wt for positive
% or less.

Mn5Cr, Fe, Si, Ni, Co, Mitsushmetal (M, M), Cr, V, Nb, effective in grain refinement, rollability and strength improvement after general ingot and tempering, Mn0 .8wt%, Cr, Fe%5iSNi,
Co, and M, M, content is 0.5 wL%, Zr,
(2) When Nb and Nb are contained in an amount exceeding 0.3 wt%, the above effects are saturated, and on the other hand, the rolling properties are reduced. Therefore, M
n 00ht% or less, Cr, Fe, Si, N1, C
.

and M, A4. The content of is 0.5u+L% or less,
Zr, Nb.

The content of ~° is 0.3 wt% or less.

Ti has a general grain refining effect in ingots, and if the content exceeds 0.3 wt%, the effect is saturated, so the Ti content is set to 0.3 u+L% or less.

B generally exhibits a mutually beneficial effect with Ti and has the effect of refining the crystal grains of the ingot, and the effect is saturated when the content exceeds 0.06111L%. Therefore, the B content is 0
．． 06wt% or less.

In addition, whether TI, Blj: Al-Ti, AI B or AlTi B are contained from the intermediate plate, the content of impurity elements in the pond is O, 1IIIt% within a range that does not impair rolling properties. The following shall apply.

(2) Regarding the leather material.

Al purity 99.0w to improve bending workability of core material
t% or more of aluminum is used as the skin material. Then, to this aluminum, Fe, Si, ＼4g, Zn,
Cu%Ni, Cr5Co, M0M0, Zr, V,
When elements such as Nb, Pb, Sn, Bi, and Sb are included,
Bending workability decreases in proportion to its content. These elements are regulated individually to 0.75wt% or less, and the total amount is 1u.
If it exceeds st%, the bending workability will deteriorate significantly. Therefore, the content of these elements individually must be 0.75 wt% or less, and the total amount must be regulated to 1 wt% or less.

Furthermore, Ti has a general grain refining effect in ingots, and the effect is saturated when the content exceeds 0.311 It%, so it is kept at 0.3 wt% or less, and B is generally Ti
It has the effect of refining the crystal grains of the ingot due to the mutual effect with the content, and if the content exceeds 0.06 wL%, the effect is saturated, so the content should be 0.06 wt% or less. Note that Ti%B is A
1-Ti, AI-B and AITi13%p can be contained in the alloy.

Therefore, the skin material is Fe, Si, Zn, Cu, Ni
, Cr, Co, Zr, V, Nb, Sb
, Bi, Sn, PbS R,E.

is regulated to 0.75wt% or less individually and 1ust% or less in total, T1 is regulated to 0.3wt% or less, B 0006wt%
Aluminum containing the following and having an Al purity of 99.0 wt% or more is used.

(3) Regarding the coverage rate of the skin material.

The coverage rate of the skin material has an important relationship with the material strength and bending workability, and the coverage rate should be 5 to 20% on one side of the total plate thickness.If it is less than 5% on one side, the decrease in strength will be small, but bending workability will be reduced. There is no improvement in the properties, and the skin material may break during the rolling process when manufacturing the laminated board.
If it exceeds %, the bending workability will be good, but the strength will be significantly lowered. Therefore, the coverage of the skin material is determined by the strength and 180
゜From the viewpoint of the balance of bending workability, it is preferable to set the amount per side to 5 to 20% of the total plate thickness.

[Example] Next, the Al-
An example of a Mg-Zn-based alloy composite plate will be described.

Example 1 Table 1 shows At that has high strength and excellent bending workability according to the present invention.
The components and component ratios of the Mg-Zn-based alloy composite plate and comparative alloy are shown.

This alloy is melted → cast → facing → heated or homogenized →
Hot rolling (rolling of laminated plates and rolling of core material only) → cold rolling →
A final heat treatment (thermal treatment) was performed, and the core material was coated with skin material on both sides at a rate of 1.0 mto (one side of the laminated board was 10%).

) with high strength and excellent bending workability according to the present invention\1-
Table tA2 shows the results of an investigation on tensile strength and 180° close bendability of Mg-Zn based alloy laminated plates, comparative plates, and core-only plates.

As is clear from Table 2, the Al-Mg-Zn-based alloy composite plate according to the present invention, which has high strength and excellent bending workability, has a bending workability of 180° compared to comparative materials and sheets with only a core material. It can be seen that it has excellent properties and high strength.

Example 2 The core material (C-5) and skin material (S-1) shown in Example 1
Regarding 0), melting → casting → homogenization → facing → heating (
up to hot rolling temperature)→Hot rolling (including laminated plate rolling)→
Cold rolling → final heat treatment, total plate thickness 1, O+o
Table 3 shows the investigation results regarding the coverage, tensile strength, and V180° close bending of the laminated plates coated on both sides with +n and one-sided coverage of 0 to 25%.

The following is clear from Table 3.

(1) There is no decrease in strength when one side coverage is less than 5%, but 1
Cracking occurs when 80° close bending is performed.

(2) When the coverage becomes 25%, the 180′ adhesion bendability improves, but the tensile strength decreases to about 70% of that of the core material alone.

(3) Therefore, when the covering ratio of the skin material is in the range of 5 to 20% per side, the tensile strength is high and the 180'' tight bendability is also excellent.

Example 3 Core materials shown in Table 1 (C-3, C-12, C-19, C
-20) and skin material (S-9>), melting → casting → homogenization → facing → heating (up to hot rolling temperature) → hot rolling → cold rolling were performed to investigate the rolling properties.

The results are shown in Table 4.

The following can be seen from Table 4.

(1) N4g content of the core material is 11wt%, and Zn,
When the Cu content is 2.5 wL%, the rolling properties are lowered, and even if rolling is possible, the bending properties are slightly inferior and necking occurs.

Table 2 (1) C-1, C-20... Comparative materials.

Table 3 Table 4 Table O: Good, Δ: Slightly good, ×: Not coated during co-rolling; cold rollability is poor even if coated.

2: 180° adhesion bendability ○: No cracks, Δ: Constriction, × 2 M cracks.

[Effects of the Invention] As explained above, the AI Mg Zn-based alloy laminated plate with high strength and excellent bending workability according to the present invention has the above structure, so it has high strength and can be bent 180° in close contact. Therefore, it can be widely used in automobiles and other general vehicles, electrical equipment, etc.

Claims (1)

[Claims] Contains Mg 3 to 10 wt%, Zn 0.3 to 2.0 wt%, and Cu 2.0 wt% or less, Mn0, 8 wt% or less, Cr0
．． 5wt% or less, Fe0.5wt% or less, Si0.5w
t% or less, Ni 0.5wt% or less, Co 0.5wt% or less, misch metal (MM) 0.5wt% or less, Zr0
．． 3wt% or less V0.3wt% or less, Nb0.3wt
% or less, Ti 0.3 wt % or less, B 0.06 wt % or less, and an aluminum alloy with an impurity of 0.1 wt % or less and the balance Al. and an aluminum skin material with an Al purity of 99.0 wt% or more, and the thickness of the skin material is 5 to 20% of the total board thickness on one side,
An Al-Mg-Zn-based alloy laminate with high strength and excellent bending workability, characterized by having a core material coated on one or both sides.