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Dynamic Collapse Mechanisms in Metal Foam Expansion
Author(s) -
Lehmhus Dirk
Publication year - 2010
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000055
Subject(s) - metal foam , materials science , titanium hydride , thermal decomposition , decomposition , limiting , composite material , foaming agent , aluminium , thermal expansion , hydride , expansion ratio , thermal , kinetic energy , metal , titanium , thermodynamics , metallurgy , mechanical engineering , chemistry , organic chemistry , porosity , engineering , physics , quantum mechanics
The study provides insight into decomposition of titanium hydride as foaming agent for powder metallurgically produced aluminum foams. Decomposition is characterized using thermal and kinetic analysis, allowing prediction of decomposition reactions. Such predictions are made for various time–temperature cycles, which are experimentally evaluated in parallel foaming experiments. A new explanation of foam collapse is derived from the results, which interprets hints at a maximum gas release rate, limiting maximum expansion, in terms of the existence of a maximum cell wall stretching rate and expanding foam can sustain. Thus a dynamic collapse criterion is added to existing static ones.