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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 13/2014

01.12.2014

Concurrent Growth of Kirkendall Pores and Vapor–Solid–Solid Protuberances on Ni Wires During Mo Vapor-Phase Deposition

verfasst von: Cong Wang, David C. Dunand

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 13/2014

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Abstract

During vapor-phase deposition at 1273 K (1000 °C), by pack cementation, of Mo onto 127-μm-diameter Ni wires, two phenomena are observed to occur concurrently, leading to strong surface roughening: (i) the inward radial growth of Kirkendall pores below the wire surface and (ii) the outward growth from the wire surface of protuberances with sizes as large as 15 μm. High-aspect-ratio Kirkendall pores as long as 21 μm are created because of imbalanced interdiffusion between Mo and Ni. These pores in turn, by reducing the flow of Mo into the wires, may enhance the outward growth of Mo-rich protuberances, further roughening the wire surface. These protuberances have faceted tips as well as terraces and steps, indicating that their growth is governed by the vapor–solid–solid mechanism.
Vorheriger Artikel The Effect of Forging Variables on the Supersolvus Heat-Treatment Response of Powder-Metallurgy Nickel-Base Superalloys
Nächster Artikel An Experimental Investigation into Additive Manufacturing-Induced Residual Stresses in 316L Stainless Steel

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Metadaten
Titel
Concurrent Growth of Kirkendall Pores and Vapor–Solid–Solid Protuberances on Ni Wires During Mo Vapor-Phase Deposition
verfasst von
Cong Wang
David C. Dunand
Publikationsdatum
01.12.2014
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 13/2014
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-014-2587-4

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