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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Environment-Assisted Cracking of High-Strength Magnesium Alloys WE43-T6
verfasst von : A. Ahmad, T. J. Marrow
Erschienen in: Fracture of Nano and Engineering Materials and Structures
Verlag: Springer Netherlands
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Some magnesium alloys experience environment assisted cracking (EAC) in ambient atmospheric air, and hydrogen embrittlement is the dominant mechanism [
1
–
3
]. The highest susceptibility has been found in aluminum-containing alloys (6% max) [
4
–
5
]. EAC has also been observed in pure magnesium [
3
]. The EAC sensitivity of aluminum-free rare earth-containing alloys, such as WE43 has not been previously investigated in detail. Previous work has shown that plastic strain nucleates EAC in WE43-T6 by cracking of the intergranular intermetallic [
6
]. This paper reports a quantitative study of the crack nucleation mechanism in WE43-T6. This is part of a project that aims to predict the probability of nucleation and propagation of cracks at notches and micro-shrinkage porosity in cast engineering materials.