The origin of driving force for the formation of Sn whiskers at room temperature

Sn whiskers can form at room temperature on the agglomerated flakes produced by mechanical alloying (MA) of Ti, Sn, and C powders, whether the flakes are stored in air or water. The Sn whiskers forming in air are tens of micrometers to several centimeters in length and 0.5 to ∼10 μm in diameter. Whe...

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Bibliographic Details
Published in:Journal of materials research 2007-11, Vol.22 (11), p.3226-3232
Main Authors: Li, Shi-Bo, Bei, Guo-Ping, Zhai, Hong-Xiang, Zhang, Zhi-Li, Zhou, Yang, Li, Cui-Wei
Format: Article
Language:English
Subjects:
Mechanical alloying
Scanning electron microscopy (SEM)
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Summary:Sn whiskers can form at room temperature on the agglomerated flakes produced by mechanical alloying (MA) of Ti, Sn, and C powders, whether the flakes are stored in air or water. The Sn whiskers forming in air are tens of micrometers to several centimeters in length and 0.5 to ∼10 μm in diameter. Whereas a large amount of Sn polyhedra forms on the flakes that are stored in water, a small amount of Sn whiskers forms on the polyhedra. The driving force for Sn whisker formation is the compressive stress induced by mechanical alloying (MA) and oxidation. The mechanism about the spontaneous growth of metal whiskers is discussed.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2007.0402