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Stress corrosion cracking of magnesium

Winzer N., Song G., Atrens A., Dietzel W., Kainer K.U.

Advances in Materials Science

2007

Vol. 7, nr 1(11)

83-92

The increased use of Mg-alloys for stressed automotive components has created a demand for a better mechanistic under-standing of the environmental and mechanical influences contributing to Transgranular Stress Corrosion Cracking (TGSCC). TGSCC is the inherent mode of failure for Mg alloys exposed to aqueous environments below their yield stress. It is gener-ally accepted that the predominant mechanism(s) for TGSCC is a type of Hydrogen Assisted Cracking (HAC); however, the specific nature of this mechanism(s) is equivocal. The most commonly proposed mechanism is Delayed Hydride Cracking (DHC). This work investigates its tenability by comparing experimental measurements of the stress corrosion crack velocity, Vc with predictions based on a numerical model for DHC. The measured velocity was in the range of 7x10-10 m/s to 5x10-9 m/s. The initial prediction of the DHC model is 5x10-7 m/s. An investigation into the sensitivity of the model to input parameters is currently underway.

Stress-assisted diffusion and the modified Fick law

Piekarski S.

Journal of Technical Physics

2005

Vol. 46, no 1

3-7

It can be observed that the equation for "stress-assisted diffusion" applied by Shewmon (P.G. Shewmon, Diffusion in solids, McGraw-Hill, 1963) is simply the Einstein-Smoluchowski equation. In turn, for a constant temperature field, the modified Fick law (introduced in: S. Piekarski, On the modified Fick law and its potential applications, J. Tech. Phys., 44, 2, 125-131, 2003) reduces to the Einstein-Smoluchowski equation. Therefore, the solutions of the modified Fick law can be adopted to the problems considered by Shewmon. In this paper, the problems of diffusion and thermodiffusion in the strain fields of dislocations (screw and edge) are considered and new solutions are briefly discussed.