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Dissolution of Ordered Precipitates under ion Irradiation

Published online by Cambridge University Press:  16 February 2011

Eric Camus,
Françise Bourdeau,
Christian Abromeit,
Nelja Wanderka and
Heinrich Wollenberger
Eric Camus
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Str. 100, D–14109 Berlin, Federal Republic of Germany
Françise Bourdeau
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Str. 100, D–14109 Berlin, Federal Republic of Germany
Christian Abromeit
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Str. 100, D–14109 Berlin, Federal Republic of Germany
Nelja Wanderka
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Str. 100, D–14109 Berlin, Federal Republic of Germany
Heinrich Wollenberger
Affiliation:
Hahn-Meitner-Institut Berlin GmbH, Glienicker Str. 100, D–14109 Berlin, Federal Republic of Germany
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Abstract

The stability of the ordered γʹ precipitates under 300-keV Ni+ irradiation was investigated between room temperature and 623 K. The two competing mechanisms of destabilization by cascade producing irradiation, i. e. disordering and dissolution of the γʹ precipitates in Nimonic PE16 alloy, has been studied separately by electron microscopy and field-ion microscopy with atom probe. At high temperatures, the precipitates are stable. At intermediate temperatures, the precipitates dissolve by ballistic mixing into the matrix, but the interface is restored by the radiation-enhanced atomic jumps. The order in the precipitates remains stable. At low temperatures, the precipitates are dissolved by atomic mixing. The dissolution proceeds in a diffusional manner with a diffusion coefficient normalized by the displacement rate D/K = 0.75 nm2dpa −1. The precipitates become disordered by a fluence of 0.1 dpa, whereas precipitate dissolution needs much higher fluences.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 373: Symposium Y – Microstructure of Irradiated Materials , 1994, 83
Copyright
Copyright © Materials Research Society 1995

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References

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