TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb

Pertti Nenonen, Petri Nyberg, Tapio Planman, Matti Valo

    Research output: Book/ReportReport

    Abstract

    Tensile specimens of Zr-1%Nb plate were irradiated in Loviisa 1 NPP for one year during 1978-1979. The previous examinations with these specimens consisted of tensile tests at 24 °C and 280 °C. The results of some further studies with these specimens are presented in this report. Unirradiated Zr-1%Nb plate was used as a reference material. The defect structures present in the material after different treatments and the recovery of defects in thermal annealing were examined with transmission electron microscope (TEM) and by hardness and positron lifetime measurements. Four different treatment variations were included: recrystallized (unirradiated), irradiated, heavily cold-worked (unirradiated) and both irradiated and cold-worked. The TEM examinations showed high defect density both in the as-irradiated and in the cold-worked specimens. The as-irradiated specimen was assumed to contain mostly various types of point defects, whereas a dense dislocatior. network was present in the cold-worked specimens. Only slight (if any) change could be observed in the microstructure after one hour annealing at 400 °C. The recovery behaviour of the as-irradiated and cold-worked specimens found by the hardness and positron lifetime measurements were very close to each other. The measurements showed that the recovery occurred mainly at 450-550 °C. The results are compared to those presented in the literature for zirconium. Reference is also made to the results of the previous tensile tests.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages25
    ISBN (Print)951-38-3532-4
    Publication statusPublished - 1989
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
    Number650
    ISSN0358-5077

    Fingerprint

    positrons
    hardness
    electron microscopes
    life (durability)
    recovery
    tensile tests
    defects
    examination
    annealing
    point defects
    microstructure

    Keywords

    • metallography
    • metals
    • zirconium
    • cold working
    • annealing
    • irradiation
    • transmissometers
    • positrons
    • life (durability)
    • hardness
    • defects

    Cite this

    Nenonen, P., Nyberg, P., Planman, T., & Valo, M. (1989). TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 650
    Nenonen, Pertti ; Nyberg, Petri ; Planman, Tapio ; Valo, Matti. / TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb. Espoo : VTT Technical Research Centre of Finland, 1989. 25 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 650).
    @book{54de618fb30f4655838268571a838ad8,
    title = "TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1{\%}Nb",
    abstract = "Tensile specimens of Zr-1{\%}Nb plate were irradiated in Loviisa 1 NPP for one year during 1978-1979. The previous examinations with these specimens consisted of tensile tests at 24 °C and 280 °C. The results of some further studies with these specimens are presented in this report. Unirradiated Zr-1{\%}Nb plate was used as a reference material. The defect structures present in the material after different treatments and the recovery of defects in thermal annealing were examined with transmission electron microscope (TEM) and by hardness and positron lifetime measurements. Four different treatment variations were included: recrystallized (unirradiated), irradiated, heavily cold-worked (unirradiated) and both irradiated and cold-worked. The TEM examinations showed high defect density both in the as-irradiated and in the cold-worked specimens. The as-irradiated specimen was assumed to contain mostly various types of point defects, whereas a dense dislocatior. network was present in the cold-worked specimens. Only slight (if any) change could be observed in the microstructure after one hour annealing at 400 °C. The recovery behaviour of the as-irradiated and cold-worked specimens found by the hardness and positron lifetime measurements were very close to each other. The measurements showed that the recovery occurred mainly at 450-550 °C. The results are compared to those presented in the literature for zirconium. Reference is also made to the results of the previous tensile tests.",
    keywords = "metallography, metals, zirconium, cold working, annealing, irradiation, transmissometers, positrons, life (durability), hardness, defects",
    author = "Pertti Nenonen and Petri Nyberg and Tapio Planman and Matti Valo",
    year = "1989",
    language = "English",
    isbn = "951-38-3532-4",
    series = "Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports",
    publisher = "VTT Technical Research Centre of Finland",
    number = "650",
    address = "Finland",

    }

    Nenonen, P, Nyberg, P, Planman, T & Valo, M 1989, TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 650, VTT Technical Research Centre of Finland, Espoo.

    TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb. / Nenonen, Pertti; Nyberg, Petri; Planman, Tapio; Valo, Matti.

    Espoo : VTT Technical Research Centre of Finland, 1989. 25 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 650).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb

    AU - Nenonen, Pertti

    AU - Nyberg, Petri

    AU - Planman, Tapio

    AU - Valo, Matti

    PY - 1989

    Y1 - 1989

    N2 - Tensile specimens of Zr-1%Nb plate were irradiated in Loviisa 1 NPP for one year during 1978-1979. The previous examinations with these specimens consisted of tensile tests at 24 °C and 280 °C. The results of some further studies with these specimens are presented in this report. Unirradiated Zr-1%Nb plate was used as a reference material. The defect structures present in the material after different treatments and the recovery of defects in thermal annealing were examined with transmission electron microscope (TEM) and by hardness and positron lifetime measurements. Four different treatment variations were included: recrystallized (unirradiated), irradiated, heavily cold-worked (unirradiated) and both irradiated and cold-worked. The TEM examinations showed high defect density both in the as-irradiated and in the cold-worked specimens. The as-irradiated specimen was assumed to contain mostly various types of point defects, whereas a dense dislocatior. network was present in the cold-worked specimens. Only slight (if any) change could be observed in the microstructure after one hour annealing at 400 °C. The recovery behaviour of the as-irradiated and cold-worked specimens found by the hardness and positron lifetime measurements were very close to each other. The measurements showed that the recovery occurred mainly at 450-550 °C. The results are compared to those presented in the literature for zirconium. Reference is also made to the results of the previous tensile tests.

    AB - Tensile specimens of Zr-1%Nb plate were irradiated in Loviisa 1 NPP for one year during 1978-1979. The previous examinations with these specimens consisted of tensile tests at 24 °C and 280 °C. The results of some further studies with these specimens are presented in this report. Unirradiated Zr-1%Nb plate was used as a reference material. The defect structures present in the material after different treatments and the recovery of defects in thermal annealing were examined with transmission electron microscope (TEM) and by hardness and positron lifetime measurements. Four different treatment variations were included: recrystallized (unirradiated), irradiated, heavily cold-worked (unirradiated) and both irradiated and cold-worked. The TEM examinations showed high defect density both in the as-irradiated and in the cold-worked specimens. The as-irradiated specimen was assumed to contain mostly various types of point defects, whereas a dense dislocatior. network was present in the cold-worked specimens. Only slight (if any) change could be observed in the microstructure after one hour annealing at 400 °C. The recovery behaviour of the as-irradiated and cold-worked specimens found by the hardness and positron lifetime measurements were very close to each other. The measurements showed that the recovery occurred mainly at 450-550 °C. The results are compared to those presented in the literature for zirconium. Reference is also made to the results of the previous tensile tests.

    KW - metallography

    KW - metals

    KW - zirconium

    KW - cold working

    KW - annealing

    KW - irradiation

    KW - transmissometers

    KW - positrons

    KW - life (durability)

    KW - hardness

    KW - defects

    M3 - Report

    SN - 951-38-3532-4

    T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

    BT - TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Nenonen P, Nyberg P, Planman T, Valo M. TEM, positron lifetime and hardness measurements of irradiated, cold-worked and annealed Zr-1%Nb. Espoo: VTT Technical Research Centre of Finland, 1989. 25 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 650).