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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/1548

Title: Characterisation of stress corrosion cracking (SCC) of Mg–Al alloys
Authors: WINZER, N
ATRENS, A
DIETZEL, W
RAJA, VS
SONG, G
KAINER, KU
Keywords: hydrogen
embrittlement
mechanical testing
stress corrosion cracking
Issue Date: 2008
Publisher: Elsevier
Citation: Materials Science and Engineering: A 488(1-2), 339-351
Abstract: Stress corrosion cracking (SCC) of the Mg–Al alloys AZ91, AZ31 and AM30 in distilled water has been characterised using constant extension rate tests (CERTs) and linearly increasing stress tests (LISTs). AZ91 consists of an α-matrix with extensive β-particles, whereas AZ31 and AM30 consist only of an α-matrix with an Al-concentration similar to that in AZ91. The presence of β-particles in AZ91 was associated with: (i) a lower threshold stress, σSCC, for AZ91 (55–75 MPa) relative to AZ31 (105–170 MPa) and AM30 (130–140 MPa); and (ii) a different SCC initiation mechanism for AZ91 relative to AZ31 and AM30. The SCC velocity, Vc, for AM30 (3.6 × 10−10 to 9.3 × 10−10 m/s) was lower than that for AZ91 (1.6 × 10−9 to 1.2 × 10−8 m/s) and AZ31 (1.2 × 10−9 to 6.7 × 10−9 m/s). This was attributed to the influence of Zn and second phase particles, which are more concentrated in AZ31, on the diffusivity of H in the α-matrix.
URI: 10.1016/j.msea.2007.11.064
http://hdl.handle.net/10054/1548
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1548
ISSN: 0921-5093
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