skip to main content
Idioma:

High-voltage electron irradiation studies of several overaged γ/γ' alloys

Ardell, A.J. ; Mastel, B. ; Laidler, J.J.

Journal of nuclear materials, 1974, Vol.54 (2), p.313-324 [Periódico revisado por pares]

Elsevier B.V

Texto completo disponível

Citações Citado por
  • Título:
    High-voltage electron irradiation studies of several overaged γ/γ' alloys
  • Autor: Ardell, A.J. ; Mastel, B. ; Laidler, J.J.
  • É parte de: Journal of nuclear materials, 1974, Vol.54 (2), p.313-324
  • Descrição: The formation of irradiation-induced dislocation loops was studied in four Ni-base γ/γ' alloys, severely overaged so that the influence of individual γ/γ' interfaces could be investigated. The alloys, Ni-14.07% Al, Ni-12.68% Si, Ni-18% Cr-7% Al and Nimonic PE-16 were irradiated, using 1 MeV electrons, for various times at an irradiation temperature of 425° C to produce dislocation loops. Void formation was also induced in overaged PE-16 at an irradiation temperature of 490° C. In the binary alloys the distribution of dislocation loops was fairly uniform throughout the γ and γ' phases, the semicoherent interfaces having no apparent influence on loop formation. The Ni-Si alloy was more radiation damage resistant than the Ni-Al alloy. In the ternary alloy the nucleation and growth of dislocation loops were evidently somewhat easier in the matrix than in the γ' phase, but the coherent γ/γ' interfaces did not influence the spatial distribution of loops. The situation in PE-16 was vastly different; both dislocation loops and voids nucleated and grew preferentially in or near the coherent γ/γ' interfaces. A model is proposed which qualitatively accounts for these observations by invoking the large difference in the chemical constituents of the γ and γ' phases in PE-16 and the manner in which this factor affects the production of Frenkel pairs and the nucleation of dislocation loops and voids. Some consequences of this model are briefly discussed. The formation of irradiation-induced dislocation loops was studied in four Ni-base γ/γ' alloys, severely overaged so that the influence of individual γ/γ' interfaces could be investigated. The alloys, Ni-14.07% Al, Ni-12.68% Si, Ni-18% Cr-7% Al and Nimonic PE-16 were irradiated, using 1 MeV electrons, for various times at an irradiation temperature of 425° C to produce dislocation loops. Void formation was also induced in overaged PE-16 at an irradiation temperature of 490° C. In the binary alloys the distribution of dislocation loops was fairly uniform throughout the γ and γ' phases, the semicoherent interfaces having no apparent influence on loop formation. The Ni-Si alloy was more radiation damage resistant than the Ni-Al alloy. In the ternary alloy the nucleation and growth of dislocation loops were evidently somewhat easier in the matrix than in the γ' phase, but the coherent γ/γ' interfaces did not influence the spatial distribution of loops. The situation in PE-16 was vastly different; both dislocation loops and voids nucleated and grew preferentially in or near the coherent γ/γ' interfaces. A model is proposed which qualitatively accounts for these observations by invoking the large difference in the chemical constituents of the γ and γ' phases in PE-16 and the manner in which this factor affects the production of Frenkel pairs and the nucleation of dislocation loops and voids. Some consequences of this model are briefly discussed. In vier stark überalterten γ-γ'-Nickelbasis-Legierungen wurde die Bildung von bestrahlungsinduzierten Versetzungsringen im Hinblick auf den Einfluss auf einzelne γ-γ'-Phasengrenzen untersucht. Die Legierungen Ni-14,07% Al, Ni-12,68% Si, Ni-18% Cr-7% A1 und Nimonic PE-16 wurden mit l MeV Elektronen bei 425° C zur Bildung von Versetzungsringen verschieden lang bestrahlt. Im überalterten PE-16 wurde ferner eine Porenbüdung bei einer Bestrahlungstemperatur von 490° C induziert. Für die binären Legierungen ergibt sich eine ziemlich gleichmässige Verteilung der Versetzungsringe in der γ- und γ'-Phase. Die semikohärenten Phasengrenzen haben offenbar keinen Einfluss auf die Bildung von Versetzungsringen. Die Ni-Si-Legierung ist bestrahlungsbeständiger als die Ni-Al-Legierung. In der ternären Legierung erfolgen die Keimbildung und das Wachstum der Versetzungsringe in der Matrix offenbar etwas leichter als in der γ-Phase, die räumliche Verteilung der Versetzungsringe wird durch die kohärenten γ-γ'-Phasengrenzen nicht beeinflusst. Das Verhalten von PE-16 ist davon völlig verschieden. Die Versetzungsringe und Poren entstehen und wachsen vorzugsweise an oder in der Nähe der kohärenten γ-γ'-Phasengrenzen. Es wird ein Modell vorgeschlagen, das diese Beobachtungen qualitativ erklärt, wobei der grosse Unterschied in den chemischen Bestandteilen der γ- und γ'-Phase von PE-16 und der Einfluss dieses Faktors auf die Bildung von Frenkel-Paaren und auf die Keimbildung bei den Versetzungsringen und den Poren berücksichtigt werden. Einige Folgerungen aus diesem Modell werden kurz diskutiert.
  • Editor: Elsevier B.V
  • Idioma: Francês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.