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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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Abstract

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
Authors:
AuthorsInstitution or Email of Authors
Biallas, GerhardUNSPECIFIED
Maier, Hans JürgenUniversität Paderborn
Gall, KenUniversity of Colorado
Date:2004
Journal or Publication Title:Proc. LCF5, Fifth International Conference on Low Cycle Fatigue
Page Range:pp. 297-302
Editors:
EditorsEmail
Portella, P.D.UNSPECIFIED
Sehitoglu, H.UNSPECIFIED
Hatanaka, K.UNSPECIFIED
Publisher:Deutscher Verband für Materialforschung und -prüfung e.V., Berlin
Status:Published
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 Location:Berlin
Event Type:international Conference
Event Dates:2003-09-09 - 2003-11-09
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Köln-Porz
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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