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Investigation of discontinuous precipitation upon age-hardening of invar-based Sn alloy

Published online by Cambridge University Press:  18 September 2017

Maryam Akhlaghi ,
Reza Rahimi ,
Christina Schröder ,
Olga Fabrichnaya  and
Olena Volkova
Maryam Akhlaghi*
Affiliation:
Institute of Iron and Steel Technology, TU Bergakademie Freiberg, Freiberg 09599, Germany
Reza Rahimi
Affiliation:
Institute of Iron and Steel Technology, TU Bergakademie Freiberg, Freiberg 09599, Germany
Christina Schröder
Affiliation:
Institute of Iron and Steel Technology, TU Bergakademie Freiberg, Freiberg 09599, Germany
Olga Fabrichnaya
Affiliation:
Institute of Materials Science, TU Bergakademie Freiberg, Freiberg 09599, Germany
Olena Volkova
Affiliation:
Institute of Iron and Steel Technology, TU Bergakademie Freiberg, Freiberg 09599, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Age-hardening of homogenized and cold-rolled invar-based Sn alloys results in the development of continuously-formed (CP) and discontinuously-formed (DP) Ni3Sn2 precipitates. In situ investigation of the DP reaction front (RF) velocity (V) revealed a nonsteady-state behavior upon early aging stages followed by a constant V after prolonged aging. The reason for the initial nonsteady-state behavior was experimentally studied and attributed to the reduction of matrix Sn-supersaturation ahead of the DP RF as a result of the simultaneous CP coarsening (in homogenized specimen) or the CP increased volume fraction (in cold-rolled specimen). A similar trend of V variation in the homogenized specimen was obtained after the modification of the original Hornbogen model for the nonsteady-state DP growth kinetics. In general, variations of the transformed matrix fraction via the DP reaction suggest the faster kinetics of this reaction in cold-rolled specimen as compared to the homogenized one due to the existence of more nucleation sites induced by the cold deformation.

Keywords

second phaseskineticsscanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 20 , 27 October 2017 , pp. 3842 - 3853
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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