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).
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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).