Environmental Influence on Fatigue Mechanisms in Cast AM60B Magnesium
Biallas, Gerhard and Maier, Hans Jürgen and Gall, Ken (2004) Environmental Influence on Fatigue Mechanisms in Cast AM60B Magnesium. In: Proc. LCF5, Fifth International Conference on Low Cycle Fatigue, pp. 297-302. Deutscher Verband für Materialforschung und -prüfung e.V., Berlin. LCF5, Fifth International Conference on Low Cycle Fatigue, 2003-09-09 - 2003-11-09, Berlin.
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In this paper, in-situ scanning electron microscopy (SEM) observations are presented focusing on the formation and propagation of small cracks in a cast magnesium alloy under low-cycle fatigue conditions. Using an environmental SEM, observations were made under both high vacuum and 20 Torr of water vapour. It was observed that fatigue damage mechanisms are substantially different in vacuum and water vapour, respectively. Fatigue cracks form more rapidly in a humid atmosphere whereas crack density was simultaneously reduced. Crack nucleation frequently occurred along slip bands in fatigue tests conducted in vacuum whereas the cracks nucleated preferentially in the interdendritic regions in case of water vapour environment. The differences are attributed to the surface layer formed on magnesium in a humid atmosphere. Experimental evidence indicates that hydrogen embrittlement has also to be taken into account.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Environmental Influence on Fatigue Mechanisms in Cast AM60B Magnesium|
|Journal or Publication Title:||Proc. LCF5, Fifth International Conference on Low Cycle Fatigue|
|Page Range:||pp. 297-302|
|Publisher:||Deutscher Verband für Materialforschung und -prüfung e.V., Berlin|
|Keywords:||cast magnesium, in-situ fatigue, small cracks, environmental degradation, surface layer, hydrogen embrittlement, damage mechanisms|
|Event Title:||LCF5, Fifth International Conference on Low Cycle Fatigue|
|Event Type:||international Conference|
|Event Dates:||2003-09-09 - 2003-11-09|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Structures & Materials|
|Institutes and Institutions:||Institute of Materials Research > Mechanical Testing of Materials|
|Deposited By:||Dr.-Ing. Gerhard Biallas|
|Deposited On:||27 Jan 2006|
|Last Modified:||27 Apr 2009 04:55|
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