IE41814B1 - Aluminium based alloy - Google Patents
Aluminium based alloyInfo
- Publication number
- IE41814B1 IE41814B1 IE228775A IE228775A IE41814B1 IE 41814 B1 IE41814 B1 IE 41814B1 IE 228775 A IE228775 A IE 228775A IE 228775 A IE228775 A IE 228775A IE 41814 B1 IE41814 B1 IE 41814B1
- Authority
- IE
- Ireland
- Prior art keywords
- alloy
- aluminium
- based alloy
- calcium
- aluminium based
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Forging (AREA)
Abstract
1452646 Superplastics aluminium based alloy EUROPEAN ATOMIC ENERGY COMMUNITY 11 Aug 1975 [13 Nov 1974] 49059/74 Heading C7A Superplastics Aluminium alloy of composition:- The alloy may be prepared by melting calcium and aluminium together in the absence of oxygen and subsequently working e.g. rolling or drawing at a temperature above 270‹C preferably in vacuum or an inert atmosphere.
Description
This invention relates to an aluminium based alloy. Such alloys may possess superelastic or superplastic properties at certain temperatures.
Some metallic alloys are called superplastic because of 5 their capability, when heat treated, to undergo elongations of the order of more than 500% without necking and to shape-form under the action of very small loadings. These alloys can be quickly vacuum formed in a single operation Starting from sheets and complex shapes can be easily achieved.
According to the present invention there is provided an aluminium based alloy consisting of from 5 to 10% by weight of calcium and not more than 1% by weight of impurities, the remainder being aluminium. The alloy preferably comprises 7.6% by weight of calcium and not more than 1% by weight of impurities, the remainder being aluminium. This alloy has a melting point of 616°C.
The present invention also relates to a method of preparing an aluminium based alloy comprising melting calcium and aluminium together in the absence of oxygen to produce an aluminium based alloy comprising from 5 to 10% by weight of calcium and not more than 1% by weight of impurities, the remainder being aluminium.
The alloy is subjected to mechanical treatment such as rolling or drawing at a temperature higher than 27O°C.
The mechanical treatment is conveniently carried out in the absence of oxygen.
The aluminium based alloys prepared by the method of the present invention have superplastic properties preferably superplastic properties under vacuum or an inert atmosphere at temperatures of from 350 to 550°C as follows :2
Properties in superplastic condition
Elongation
Load
Temperature Optimum temperature
Deformation rate Optimum Deformation rate
500-550%
0.25-1.00 kg/mm^ 35O-55O°C
400°C
0.5-0.02 cm/min.
0.2 cm/min
One method of preparing an aluminium based alloy will now be described.
The melting of the components took place under vacuum or an inert atmosphere because of the nature of the components In particular calcium metal oxidises readily in the presence of oxygen. Starting from commercially pure aluminium and calcium (purity 99-99.8%) ingots were formed by melting the components together. Furthermore under vacuum or an inert atmosphere rolling or drawing of the ingots took place at temperatures higher than 27O°C in order to obtain sheets with a thickness varying from 0.5 to 3 mm.
The mechanical properties at room temperature and normal pressure of the aluminium based alloy product are:
Tensile strength (S) 25-33 kg/mm^
Elongation (E) ^10%
Other principal characteristics of the alloy described above may be summarised as follows :a) large deformation occurred without necking up to a maximum value of 1000%,
b) the alloy had low forming stresses at moderate temperatures,
c) the possibility to form the metal readily and to obtain any desired shape without the need of very high stresses or temperatures was recognised.
d) conservation of the original properties after vacuum 5 forming and/or other operations,
e) the alloy may be welded using standard techniques. Moreover it can be anodised by usual methods in order to give a decoration finish and to enhance the corrosion resistance.
f) the corrosion behaviour of the alloy prepared as described in comparable to that of aluminium.
Claims (7)
1. An aluminium based alloy consisting of from 5 to 10% by weight of calcium and not more than 1% by weight of impurities, the remainder being aluminium. 5
2. An alloy as claimed in claim 1 comprising 7.6% by weight of calcium.
3. An alloy as claimed in claim 1 and substantially as hereinbefore described.
4. A method of preparing an aluminium base alloy as claimed x 0 in claim 1 comprising melting calcium and aluminium together ln the absence of oxygen to produce an aluminium based alloy, and subjecting the alloy to mechanical treatment at a temperature higher than 27O°C.
5. A method as claimed in claim 4 wherein the mechanical 15 treatment is carried out in the absence of oxygen.
6. A method as claimed in claim 4 and substantially as hereinbefore described.
7. An alloy whenever prepared by a method as claimed in any one of claims 4 to 6.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4905974A GB1452646A (en) | 1974-11-13 | 1974-11-13 | Aluminium based alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE41814L IE41814L (en) | 1976-05-13 |
| IE41814B1 true IE41814B1 (en) | 1980-03-26 |
Family
ID=10450967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE228775A IE41814B1 (en) | 1974-11-13 | 1975-10-21 | Aluminium based alloy |
Country Status (9)
| Country | Link |
|---|---|
| BE (1) | BE835463A (en) |
| DE (1) | DE2548171A1 (en) |
| DK (1) | DK489775A (en) |
| FR (1) | FR2291283A1 (en) |
| GB (1) | GB1452646A (en) |
| IE (1) | IE41814B1 (en) |
| IT (1) | IT1052188B (en) |
| LU (1) | LU73791A1 (en) |
| NL (1) | NL7512969A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU82002A1 (en) * | 1979-12-17 | 1980-04-23 | Euratom | PROCESS FOR MAKING OBJECTS FORMED FROM A SUPERPLASTIC ALLOY MORE DUCTILE |
| US20190316241A1 (en) * | 2016-07-12 | 2019-10-17 | Nippon Light Metal Company, Ltd. | Aluminum alloy plastic working material and production method therefor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1935245A (en) * | 1932-01-23 | 1933-11-14 | Calloy Ltd | Process for the reduction of alkaline earth metals and the production of alloys of aluminium |
| DE1133562B (en) * | 1960-06-09 | 1962-07-19 | Sueddeutsche Kalkstickstoff | Process for the production of calcium-aluminum alloys |
-
1974
- 1974-11-13 GB GB4905974A patent/GB1452646A/en not_active Expired
-
1975
- 1975-10-21 IE IE228775A patent/IE41814B1/en unknown
- 1975-10-24 DE DE19752548171 patent/DE2548171A1/en not_active Ceased
- 1975-10-30 DK DK489775A patent/DK489775A/en unknown
- 1975-11-05 NL NL7512969A patent/NL7512969A/en not_active Application Discontinuation
- 1975-11-12 IT IT5217875A patent/IT1052188B/en active
- 1975-11-12 LU LU73791A patent/LU73791A1/xx unknown
- 1975-11-12 BE BE1007005A patent/BE835463A/en not_active IP Right Cessation
- 1975-11-13 FR FR7534677A patent/FR2291283A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2548171A1 (en) | 1976-05-26 |
| IT1052188B (en) | 1981-06-20 |
| NL7512969A (en) | 1976-05-17 |
| BE835463A (en) | 1976-03-01 |
| IE41814L (en) | 1976-05-13 |
| DK489775A (en) | 1976-05-14 |
| FR2291283A1 (en) | 1976-06-11 |
| LU73791A1 (en) | 1976-06-11 |
| GB1452646A (en) | 1976-10-13 |
| FR2291283B1 (en) | 1981-01-23 |
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