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Study on Crack-like Pores of Al Foams Made via the Powder-Metallurgy Route

✍ Scribed by Lei Wang; Guangchun Yao; Yihan Liu; Guoyin Zu

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
266 KB
Volume
12
Category
Article
ISSN
1438-1656

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✦ Synopsis

Abstract

Mechanisms for the formation and disappearance of the crack‐like pores generated during the early stage of Al foaming are investigated. A model for their disappearance process is proposed for the first time. The stress, perpendicular to the compaction direction in uniaxial cold compaction, is caused by the interaction of the Al powder under a high compaction pressure and is the main reason for the formation of the crack‐like pores. The results of the model analysis and theoretical calculations suggest that the pressure difference Δ__P__ between the initial, round bubbles and the crack‐like pores is the driving force for their disappearance. The rapid reduction of Δ__P__ is attributed to the decomposition characteristics of the TiH~2~ powder.

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