Paper Title:
Environmentally Assisted Cracking of Magnesium Alloys
  Abstract

The propensity of the magnesium alloys AM30 and AZ91 to environmentally assisted cracking, and in particular to hydrogen embrittlement, was assessed in constant extension rate tensile tests on smooth and pre-cracked specimens which were subjected to monotonic loading in corrosive environment. The experimental findings can be rationalized by model approaches: A meso-scale fibre bundle model was employed to simulate the results obtained in tests on smooth AZ91 tensile specimens, assuming a combination of pitting and subsequent hydrogen embrittlement as the underlying failure mechanism. The experiment data as well as the model results revealed the effect of hydrogen embrittlement on crack growth resistance. The model calculations generated fracture surfaces which were in remarkable correspondence with those observed in the experiments, and stress-strain curves similar to the experimental ones, both reflecting the influence of the applied strain rate on hydrogen induced failure. The effect of hydrogen embrittlement on cracking in AM30 was assessed using a fracture mechanics based approach. A cohesive model which accounts for hydrogen enhanced crack extension and which earlier has been successfully applied to HE of steels is currently readjusted to EAC of magnesium.

  Info
Periodical
Chapter
Chapter 6: Corrosion and Surface Modification
Edited by
Hajo Dieringa, Norbert Hort and Karl Ulrich Kainer
Pages
373-376
DOI
10.4028/www.scientific.net/MSF.690.373
Citation
W. Dietzel, "Environmentally Assisted Cracking of Magnesium Alloys", Materials Science Forum, Vol. 690, pp. 373-376, 2011
Online since
June 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Wolfgang Dietzel, Michael Pfuff, Guido G. Juilfs
Abstract:Fracture mechanics based test and evaluation techniques are used to gain insight into the phenomenon of stress corrosion cracking (SCC) and...
11
Authors: Lokesh Choudhary, R.K. Singh Raman
Chapter 10: Medical Applications
Abstract:Threshold stress intensity factor for stress corrosion cracking (KISCC) of AZ91D magnesium alloy in a simulated...
487