EP0110190B1 - Aluminiumlegierungen für Kernanlagen - Google Patents

Aluminiumlegierungen für Kernanlagen Download PDF

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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
Application number
EP83111019A
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English (en)
French (fr)
Other versions
EP0110190A1 (de
Inventor
Paolo Fiorini
Giuseppe Giordano
Giovanni Piatti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aluminia SpA
Original Assignee
Aluminia SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aluminia SpA filed Critical Aluminia SpA
Priority to AT83111019T priority Critical patent/ATE25467T1/de
Publication of EP0110190A1 publication Critical patent/EP0110190A1/de
Application granted granted Critical
Publication of EP0110190B1 publication Critical patent/EP0110190B1/de
Expired legal-status Critical Current

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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)

Claims (3)

1. Verwendung von Aluminiumlegierungen mit der folgenden Zusammensetzung (Gew.-%):
Mg von 0,2 bis 4,0%,
V von 0,1 bis 2,0%,
gegebenenfalls Si von 0 bis 1%.
gegebenenfalls andere Elemente in einer Gesamtmenge
von weniger als 1000 ppm, und
Rest AI bis zu 100%

in Komponenten von Vorrichtungen, welche während ihres Einsatzes einer Neutronenstrahlung unterworfen sind, insbesondere in der ersten Wand von Kernfusionsreaktoren.
2. Aluminiumlegierung, gekennzeichnet durch die folgende Zusammensetzung (Gew.-%):
Mg von 0,2 bis 1 %,
V von 0,5 bis 2%,
Si von 0,2 bis 1 %,
gegebenenfalls andere Elemente in einer Gesamtmenge
von weniger als 150 ppm, und
Rest AI bis zu 100%.
3. Verwendung der Aluminiumlegierungen nach Anspruch 2 in Komponente von Vorrichtungen, die während ihres Einsatzes einer Neutronenstrahlung unterworfen sind, insbesondere in der ersten Wand von Kernfusionsreaktoren.
EP83111019A 1982-11-26 1983-11-04 Aluminiumlegierungen für Kernanlagen Expired EP0110190B1 (de)

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 (de) 1984-06-13
EP0110190B1 true EP0110190B1 (de) 1987-02-11

Family

ID=11213592

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83111019A Expired EP0110190B1 (de) 1982-11-26 1983-11-04 Aluminiumlegierungen für Kernanlagen

Country Status (4)

Country Link
EP (1) EP0110190B1 (de)
AT (1) ATE25467T1 (de)
DE (1) DE3369796D1 (de)
IT (1) IT1154589B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
METALS Handbook, Desk edition 1985, American Society for metals, page 6.1 *

Also Published As

Publication number Publication date
DE3369796D1 (en) 1987-03-19
IT1154589B (it) 1987-01-21
IT8224457A1 (it) 1984-05-26
EP0110190A1 (de) 1984-06-13
ATE25467T1 (de) 1987-02-15
IT8224457A0 (it) 1982-11-26

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