Time resolved evolution of the 3D nanoporous structure of sintered Ag by X-Ray nanotomography: role of the interface with a copper substrate

The evolution of the nanoporous structure of cylindrical sintered silver samples during high temperature aging, ranging from 200 {\textdegree}C to 350 {\textdegree}C for 350 min, is studied through in-situ Computed X-Ray Tomography. Investigations were performed for two types of specimens: pure sint...

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Published in:arXiv.org 2021-10
Main Authors: Kokouvi Happy N'Tsouaglo, Milhet, Xavier, Colin, Jérôme, Signor, Loic, Nait-Ali, Azdine, Creus, Juan, Gueguen, Mikael, Gadaud, Pascal, Legros, Marc
Format: Article
Language:English
Subjects:
Aging
Copper
Diffusion rate
Evolution
High temperature
Ostwald ripening
Silver
Sintering (powder metallurgy)
Substrates
Surface energy
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creator Kokouvi Happy N'Tsouaglo
Milhet, Xavier
Colin, Jérôme
Signor, Loic
Nait-Ali, Azdine
Creus, Juan
Gueguen, Mikael
Gadaud, Pascal
Legros, Marc
description The evolution of the nanoporous structure of cylindrical sintered silver samples during high temperature aging, ranging from 200 {\textdegree}C to 350 {\textdegree}C for 350 min, is studied through in-situ Computed X-Ray Tomography. Investigations were performed for two types of specimens: pure sintered silver and 2 specimens containing a silver-copper interface. It is shown that the overall pore evolution is driven by the evolution of very few large ones. The smaller pores, although being more numerous, do not really evolve before being absorbed by the few bigger ones. In pure silver, pore evolution is driven by diffusion (Ostwald ripening) but the presence of an interface promotes faster growth kinetics until the aging time reaches a threshold value, after which a deviation from Ostwald ripening occurs. The transition is a function of the aging temperature. This behavior is associated with the competition between elastic relaxation and surface energy minimization.
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subjects Aging
Copper
Diffusion rate
Evolution
High temperature
Ostwald ripening
Silver
Sintering (powder metallurgy)
Substrates
Surface energy
title Time resolved evolution of the 3D nanoporous structure of sintered Ag by X-Ray nanotomography: role of the interface with a copper substrate
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