EP0065816A2 - Alliage à base de zirconium - Google Patents

Alliage à base de zirconium Download PDF

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Publication number
EP0065816A2
EP0065816A2 EP82302021A EP82302021A EP0065816A2 EP 0065816 A2 EP0065816 A2 EP 0065816A2 EP 82302021 A EP82302021 A EP 82302021A EP 82302021 A EP82302021 A EP 82302021A EP 0065816 A2 EP0065816 A2 EP 0065816A2
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EP
European Patent Office
Prior art keywords
alloy
weight
content
quenching
zirconium
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.)
Withdrawn
Application number
EP82302021A
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German (de)
English (en)
Other versions
EP0065816A3 (fr
Inventor
Hernán Américo Peretti Hollemaert
Juan Carlos Bolcich
Manfred H.F.P. Centro Atómico Baroliche Ahlers
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.)
Comision Nacional de Energia Atomica CNEA
Original Assignee
Comision Nacional de Energia Atomica CNEA
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 Comision Nacional de Energia Atomica CNEA filed Critical Comision Nacional de Energia Atomica CNEA
Publication of EP0065816A2 publication Critical patent/EP0065816A2/fr
Publication of EP0065816A3 publication Critical patent/EP0065816A3/fr
Withdrawn legal-status Critical Current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
    • C22C16/00—Alloys based on zirconium

Definitions

  • the present invention provides a zirconium base alloy with niobium and aluminium as alloying elements and a method for obtaining the said alloy.
  • the alloy of this invention presents a low content of the niobium and aluminium alloying elements and provides an alloy which has particular value in the fabrication of structural components and fuel elements of nuclear reactors.
  • Zirconium is a metal which has low capture cross section for thermal neutrons (0.18 barn). Due to its good mechanical properties, it is the metal which has the lowest capture cross section for a given mechanical design load.
  • the resulting thickness of spare parts will absorb less neutrons than if any other metal were used for its fabrication.
  • the high temperature (bcc) beta phase is stable above 1,133 K (860 . C) whereas at lower temperatures one has the (hcp) alpha phase.
  • the binary Zr-Nb alloy with low Nb components (less than 6.5 weight %) a martensitic phase is obtained after quenching. If the Nb component is between 6.5 weight % and 20 weight %, the beta phase is retained and omega precipitates appear after quenching the sample. If the Nb content is greater than 20 weight % only the beta phase is retained after quenching.
  • Nb has a valency of 5 and is a beta stabiliser.
  • the binary alloys Zr-Nb have been modified by the addition of Al, which having a valency of 3, acts in opposition to Nb and favours the alpha phase stabilisation.
  • One of the aims of the present invention is to develop a method to obtain a ternary Zr-Nb-Al alloy capable of retaining the high temperature beta phase by quenching, in order subsequently to induce by deformation a martensitic phase in the material.
  • a second aim of the present invention is to devise a method to obtain a ternary Zr-Nb-Al alloy which by deformation would allow the induction of a martensitic phase (not only deformation by slip) which would make possible the elongation of the material with a high degree of hardening.
  • Al and Nb as alloying elements for Zr is found convenient because Al also has a low absorption cross section for thermal neutrons (0.23 barns) and that of Nb (1.18 barns) is approximately three times smaller than that for Mo.
  • Fig. 1 the ordinate is the applied load on the sample versus the percentage of deformation ( ⁇ 1/1).100 as abcissa.
  • Fig. 2 shows for the same sample, the critical yield stress as a function of the measured temperature given in the abcissa.
  • Fig. 3 shows two curves, the upper one corresponding the ultimate tensile strength ⁇ uts and the lower one for the corresponding plastic deformation £ f , both as a function of temperature in the abcissa.
  • the alloy which is obtained in this manner does not have a pseudo-elastic behaviour.
  • For this-it would be necessary to have a martensitic transformation assisted by stresses, that is to say, that the material would retain the beta phase after quenching and that by applied stresses the martensite would be induced without reaching the normal plastic deformation of the beta phase.
  • the pseudo-elastic effect were to exist, the material would recuperate its initial shape after removal of the load.
  • the method for obtaining the above described alloy consists of the following sequential stages :
  • Control of oxygen in stage (a) is of great importance as.it produces solid solution hardening. Typical values by weight are 1000 ppm and 1600 ppm.
  • stage (b) By the hot forging in stage (b) there is obtained a structure of homogeneous and smaller grains which favours the subsequent mechanical behaviour of the material.
  • stage (c) After each quenching indicated in stage (c), the beta phase is again retained and the material can be deformed to accomplish the final geometry. During the deformation martensite is induced producing the so-called TRIP effect. This deformation corresponds to the already mentioned stage (d).
  • each deformation cycle is stopped before the fracture stress is reached, and the quench treatment of stage (c) is repeated, which allows the material to be once more deformed.
  • the treatment is ceased when finally a "duplex" is obtained, viz. a beta phase and induced martensite appropriate for the use of the material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
EP82302021A 1981-04-20 1982-04-20 Alliage à base de zirconium Withdrawn EP0065816A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AR28501881A AR223104A1 (es) 1981-04-20 1981-04-20 Metodo para la obtencion de una aleacion base zirconio y la aleacion asi obtenida,especialmente aplicable a la fabricacion de componentes estructurales de o para reactores nucleares
AR285018 1981-04-20

Publications (2)

Publication Number Publication Date
EP0065816A2 true EP0065816A2 (fr) 1982-12-01
EP0065816A3 EP0065816A3 (fr) 1983-01-12

Family

ID=3475947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302021A Withdrawn EP0065816A3 (fr) 1981-04-20 1982-04-20 Alliage à base de zirconium

Country Status (3)

Country Link
EP (1) EP0065816A3 (fr)
JP (1) JPS5845342A (fr)
AR (1) AR223104A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1067729C (zh) * 1998-08-25 2001-06-27 西北有色金属研究院 一种锆铌合金的制备方法
CN107022696A (zh) * 2017-04-25 2017-08-08 西北有色金属研究院 一种生物医用亚稳定β型Zr‑Nb合金铸锭及其制备方法
CN108411157A (zh) * 2018-04-27 2018-08-17 广西大学 一种低弹性模量新型医用锆合金及其设计方法
CN117684044A (zh) * 2023-12-22 2024-03-12 昆明理工大学 一种形变诱导马氏体相变增强的Zr基合金

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB813124A (en) * 1956-02-21 1959-05-06 Atomic Energy Authority Uk Improvements in or relating to the heat treatment of zirconium alloys
GB783646A (en) * 1954-07-12 1957-09-25 Atomic Energy Authority Uk Zirconium ternary alloys
GB988069A (en) * 1962-09-26 1965-04-07 Imp Metal Ind Kynoch Ltd Improvements in or relating to zirconium-base alloys

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1067729C (zh) * 1998-08-25 2001-06-27 西北有色金属研究院 一种锆铌合金的制备方法
CN107022696A (zh) * 2017-04-25 2017-08-08 西北有色金属研究院 一种生物医用亚稳定β型Zr‑Nb合金铸锭及其制备方法
CN107022696B (zh) * 2017-04-25 2018-09-18 西北有色金属研究院 一种生物医用亚稳定β型Zr-Nb合金铸锭及其制备方法
CN108411157A (zh) * 2018-04-27 2018-08-17 广西大学 一种低弹性模量新型医用锆合金及其设计方法
CN108411157B (zh) * 2018-04-27 2020-03-24 广西大学 一种低弹性模量新型医用锆合金及其设计方法
CN117684044A (zh) * 2023-12-22 2024-03-12 昆明理工大学 一种形变诱导马氏体相变增强的Zr基合金

Also Published As

Publication number Publication date
JPS5845342A (ja) 1983-03-16
AR223104A1 (es) 1981-07-15
EP0065816A3 (fr) 1983-01-12

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Inventor name: PERETTI HOLLEMAERT, HERNAN AMERICO

Inventor name: BOLCICH, JUAN CARLOS

Inventor name: AHLERS, MANFRED H.F.P.CENTRO ATOMICO BAROLICHE