Stress corrosion cracking behavior of magnesium alloys EV31A and AZ91E

The stress corrosion cracking of the sand cast magnesium alloys, Elektron 21 (ASTM-EV31A) and AZ91E, was studied using compact tension specimens in distilled water and in Mg(OH)2 saturated 0.1M NaCl solution under constant load. EV31A showed a higher KISCC than AZ91E, but exhibited a higher stage II...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-10, Vol.583, p.169-176
Main Authors: Padekar, Bharat S., Raja, V.S., Raman, R.K. Singh, Lyon, P.
Format: Article
Language:English
Subjects:
Applied sciences
Casting
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fracture
Fractures
Hydrogen embrittlement
Magnesium alloys
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Methods of crystal growth
physics of crystal growth
Physics
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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Summary:The stress corrosion cracking of the sand cast magnesium alloys, Elektron 21 (ASTM-EV31A) and AZ91E, was studied using compact tension specimens in distilled water and in Mg(OH)2 saturated 0.1M NaCl solution under constant load. EV31A showed a higher KISCC than AZ91E, but exhibited a higher stage II crack growth rate than the latter. Fractography showed transgranular cracking for AZ91E and EV31A in distilled water, whereas mixed intergranular and transgranular cracking was observed for EV31A in the chloride environment. The crack propagation involved hydrogen embrittlement.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.06.085