EP0110190B1 - Aluminium alloys for nuclear apparatus - Google Patents
Aluminium alloys for nuclear apparatus Download PDFInfo
- Publication number
- EP0110190B1 EP0110190B1 EP83111019A EP83111019A EP0110190B1 EP 0110190 B1 EP0110190 B1 EP 0110190B1 EP 83111019 A EP83111019 A EP 83111019A EP 83111019 A EP83111019 A EP 83111019A EP 0110190 B1 EP0110190 B1 EP 0110190B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloys
- weight
- aluminium alloys
- balance
- nuclear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 11
- 230000004927 fusion Effects 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 24
- 239000000956 alloy Substances 0.000 abstract description 24
- 238000000034 method Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910008329 Si-V Inorganic materials 0.000 description 1
- 229910006768 Si—V Inorganic materials 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000011437 continuous method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
Definitions
- This invention relates to aluminium alloys possessing time-stable mechanical, physical and chemical characteristics suitable for their use in nuclear apparatus, in particular in the first wall of nuclear fusion reactors.
- the first wall of a nuclear fusion reactor is known to require the use of materials able to withstand very critical operating conditions for a long period of time (up to 10 years), they being subjected to temperatures up to 350-400 0 C (with a minimum of 120°C), to neutron irradiation and to corrosion in very pure water. Because of its low activity following neutron irradiation, pure aluminium might appear to be a material suitable for this purpose. However, when in the pure state and especially when hot, this material has low mechanical properties and low corrosion resistance, insufficient for its use for the aforesaid application. This deficiency of pure aluminium could be overcome by using its known commercial alloys containing additives such as Si, Zn, Cu, Mg, Fe, Ni, Cr, Mn and Zr.
- hyper-pure alloys containing conventional additives of low activity would leave the problem of hot corrosion resistance in very pure water unsolved.
- Said aluminium alloys exhibit improved resistance weldability and are particularly used for automotive metal working applications.
- AI-alloys are used by the known art in fields which are very far from the use in nuclear apparatus, in particular in the first wall of nuclear fusion reactors.
- the object of the present invention is therefore to provide aluminium alloys having the necessary initial mechanical, physical and chemical characteristics for their use in nuclear apparatus, in particular in the first wall of nuclear fusion reactors, said alloys being also able to maintain said initial characteristics substantially stable with time during their use.
- aluminium alloys containing Mg in a quantity of between 0.2 and 4% by weight, V in a quantity of between 0.1 and 2.0% by weight, possibly Si in a quantity of between 0 and 1% by weight, and conventional impurities (such as Cu, Mn, Cr, Ti, Zn, Ni, B, Fe) in a total quantity of less than 1000 p.p.m. by weight, the balance to 100% being represented by Al.
- Said alloys can be prepared by the known typical casting methods for AI alloys (fusion-produced alloys).
- suitable known cycles comprising homogenisation, extrusion and/or rolling, and/or other plastic deformation processes which may be necessary, as known to experts of the art.
- Said alloys according to the invention can also be prepared (in particular alloys containing Si) by the known powder technology method.
- a dispersed phase of AI 2 0 3 and/or A1 2 0 3 -MgO type can also be present.
- compositions for the alloys prepared by fusion according to the invention comprise 2.5-3% of Mg, 0.1-0.5% of V, possibly 0.05-0.2% of Si, and less than 150 p.p.m. of conventional impurities, the balance to 100% being AI (quantities expressed by weight).
- Preferred compositions for alloys prepared by powder metallurgy according to the invention comprise 0.2-1 % of Mg, 0.2-1 % of Si, 0.5-2% of V, and less than 150 p.p.m. of conventional impurities, the balance to 100% being AI (quantities expressed by weight). Alloys prepared by fusion are particularly suitable for maximum operating temperatures of 150 200°C for the said wall, whereas powder-produced alloys are preferred for temperatures above 200°C and up to 350-400°C.
- a billet is cast by the semi-continuous method from an AI-Mg-V alloy which on chemical analysis shows the following composition (quantities expressed as % by weight):
- Said billet is homogenised for 15 hours at 400°C and 24 hours at 460°C, and is then extruded at 420°C to a diameter of 14 mm. From the extrusion obtained in this manner, samples of the required size are prepared by known methods for determining tensile, physical and creep behaviour characteristics (by ASTM procedures), these characteristics being shown hereinafter (the known symbols R, Rp 0,2, A and a being used to indicate respectively the ultimate tensile stress, 0.2% yield strength, ultimate tensile stress, 0.2% yield strength, ultimate elongation and breaking stress):
- Example 1 The procedure of Example 1. is followed, the only difference being that the alloy composition is as follows (quantities expressed in % by weight) Mg 2.68%; V 0.21%; Fe 12 p.p.m.; Si 11 p.p.m.; Cu 10 p.p.m.; Mn 5 p.p.m.; Ni 3 p.p.m.; Zn 2 p.p.m.; Ti less than 1 p.p.m.; AI balance to 100%.
- the alloy composition is as follows (quantities expressed in % by weight) Mg 2.68%; V 0.21%; Fe 12 p.p.m.; Si 11 p.p.m.; Cu 10 p.p.m.; Mn 5 p.p.m.; Ni 3 p.p.m.; Zn 2 p.p.m.; Ti less than 1 p.p.m.; AI balance to 100%.
- Powdered AI (purity 99.99%), Mg, Si and V were used (in weight proportions of Mg 0.97%, V 1.1 %, Si 0.71, AI balance to 100%) to prepare by the known powder metallurgy method a AI-Mg-Si-V alloy in the form of a billet of size 80 mm diameter x 200 mm, using the following main basic parameters: sintering temperature 580°C; sintering time 24 hours; hot compacting at 580°C with a pressure of 550 N/mm 2 ; billet extrusion at 450°C to a diameter of 10 mm; solution heat-treatment for 2 hours at 520°C; rapid quenching followed by ageing at 150°C for 15 hours.
- said extruded billet shows the following composition (% by weight): Mg 0.66%; V 1.07%; Si 0.65/; Fe 80 p.p.m.; Cu 12 p.p.m.; Mn 7 p.p.m.; Zn 3 p.p.m.; Ni 2 p.p.m.; Ti less than 1 p.p.m.; AI balance to 100%.
- said alloys have good resistance to corrosion in a moist environment, both at room temperature and under hot conditions (100-150 * C), and in addition have excellent weldability by all the typical methods for aluminium, and good workability for producing semi-finished products, even of complex form.
- the alloys according to the invention are suitable for use in nuclear apparatus components, in particular in the first wall of nuclear fusion reactors, in accordance with the objects of the invention itself.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Powder Metallurgy (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT83111019T ATE25467T1 (de) | 1982-11-26 | 1983-11-04 | Aluminiumlegierungen fuer kernanlagen. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT2445782 | 1982-11-26 | ||
| IT24457/82A IT1154589B (it) | 1982-11-26 | 1982-11-26 | Leghe di alluminio per apparecchiature nucleari |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0110190A1 EP0110190A1 (en) | 1984-06-13 |
| EP0110190B1 true EP0110190B1 (en) | 1987-02-11 |
Family
ID=11213592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83111019A Expired EP0110190B1 (en) | 1982-11-26 | 1983-11-04 | Aluminium alloys for nuclear apparatus |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0110190B1 (it) |
| AT (1) | ATE25467T1 (it) |
| DE (1) | DE3369796D1 (it) |
| IT (1) | IT1154589B (it) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4629505A (en) * | 1985-04-02 | 1986-12-16 | Aluminum Company Of America | Aluminum base alloy powder metallurgy process and product |
| EP0808911A1 (de) * | 1996-05-22 | 1997-11-26 | Alusuisse Technology & Management AG | Bauteil |
| EP0967294A1 (de) | 1998-06-26 | 1999-12-29 | ALUMINIUM RHEINFELDEN GmbH | Behandlung einer Aluminiumlegierungsschmelze |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1903842A (en) * | 1932-05-20 | 1933-04-18 | Court C Titus | Aluminum alloy |
| FR808156A (fr) * | 1935-07-26 | 1937-01-30 | Ig Farbenindustrie Ag | Alliages d'aluminiume et leurs applications |
| FR1034260A (fr) * | 1951-03-21 | 1953-07-21 | Alliage à base d'aluminium et de vanadium | |
| US3236632A (en) * | 1964-12-01 | 1966-02-22 | Dow Chemical Co | High strength aluminum alloy for pellet extrusion and product |
| US4043840A (en) * | 1976-07-09 | 1977-08-23 | Swiss Aluminium Ltd. | Aluminum alloys possessing improved resistance weldability |
-
1982
- 1982-11-26 IT IT24457/82A patent/IT1154589B/it active
-
1983
- 1983-11-04 AT AT83111019T patent/ATE25467T1/de not_active IP Right Cessation
- 1983-11-04 DE DE8383111019T patent/DE3369796D1/de not_active Expired
- 1983-11-04 EP EP83111019A patent/EP0110190B1/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| METALS Handbook, Desk edition 1985, American Society for metals, page 6.1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0110190A1 (en) | 1984-06-13 |
| IT1154589B (it) | 1987-01-21 |
| DE3369796D1 (en) | 1987-03-19 |
| IT8224457A0 (it) | 1982-11-26 |
| IT8224457A1 (it) | 1984-05-26 |
| ATE25467T1 (de) | 1987-02-15 |
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