Magnesium stress corrosion cracking

Winzer, N., Atrens, A., Dietzel, W., Song, G. and Kainer, K.U. (2007). Magnesium stress corrosion cracking. In: International Conference of Nonferrous Materials (ICNFM). International Conference of Nonferrous Materials (ICNFM), Changsha, Peoples Republic of China, (S150-S155). 25-30 November 2007.

Author Winzer, N.
Atrens, A.
Dietzel, W.
Song, G.
Kainer, K.U.
Title of paper Magnesium stress corrosion cracking
Conference name International Conference of Nonferrous Materials (ICNFM)
Conference location Changsha, Peoples Republic of China
Conference dates 25-30 November 2007
Proceedings title International Conference of Nonferrous Materials (ICNFM)   Check publisher's open access policy
Journal name Transactions of Nonferrous Metals Society of China   Check publisher's open access policy
Place of Publication Changsha, China
Publisher Nonferrous Metals Society of China
Publication Year 2007
Sub-type Fully published paper
ISSN 1003-6326
Volume 17
Issue Part A Sp. Iss. 1
Start page S150
End page S155
Total pages 6
Collection year 2008
Language eng
Abstract/Summary The significant positive green environment influence of magnesium alloy usage in transport could be compromised by catastrophic fast fracture caused by stress corrosion cracking (SCC). Transgranular stress corrosion cracking (TGSCC) of AZ91 was evaluated using the linearly increasing stress test (LIST) and the constant extension rate test (CERT). The TGSCC threshold stress was 55−75 MPa in distilled water and in 5 g/L NaCl. The TGSCC velocity was 7×10−10−5×10−9 m/s. A delayed hydride-cracking (DHC) model for TGSCC was implemented using a finite element script in MATLAB and the model predictions were compared with experiment. A key outcome is that, during steady state TGSCC propagation, a high dynamic hydrogen concentration is expected to build up behind the crack tip. A number of recommendations are given for preventing SCC of Mg alloys in service. One of the most important recommendations might be that the total stress in service (i.e. the stress from the service loading + the fabrication stress + the residual stress) should be below a threshold level, which, in the absence of other data, could be (conservatively) estimated to be about 50% of the tensile yield strength.
Keyword Stress corrosion cracking
Linearly increasing stress test
Mg-Al Alloy
High-Strength Steels
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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