Stress Corrosion Cracking of Magnesium Alloys

This paper reports on the measurement of the corrosion rate, and the stress corrosion cracking threshold stress, for ultra-high-purity Mg-5Zn. The corrosion rate was higher than the intrinsic corrosion rate of ultra-high-purity Mg, attributed to the quality of the corrosion product film. The threshold stress for stress corrosion cracking, at an applied stress rate of 0.00016 MPa s -1 , was equal to 0.7 times the yield stress in air. The ductility of the cracking indicated that the stress corrosion cracking mechanism was probably hydrogen enhanced localized plasticity.

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“…Mg alloys also suffer stress corrosion cracking (SCC) [16,17]. SCC can occur at stresses as low as 50% of the yield stress.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and stress corrosion cracking of ultra-high-purity Mg5Zn

et al. 2015

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“…Studies have shown that the SCC of Mg alloys occurs through transgranular stress corrosion cracking (TGSCC), intergranular stress corrosion cracking (IGSCC), or a mixed TGSCC/IGSCC mode 43,44) . The mode of SCC depends on the composition 44) and microstructure 45) of the alloy and possibly on environmental factors such as pH 25) .…”

Section: Effect Of Sn Content On Crack Propagationmentioning

confidence: 99%

“…The mode of SCC depends on the composition 44) and microstructure 45) of the alloy and possibly on environmental factors such as pH 25) . Figure 10 shows cross-section images of HA and SHT samples after bentbeam stress corrosion tests conducted for 1 d. As evident in the gure, the mechanism for SCC of the HA and SHT samples was IGSCC.…”

Section: Effect Of Sn Content On Crack Propagationmentioning

confidence: 99%

Effect of Microstructure Factors on Stress Corrosion Behavior of Mg<i>-x</i>Sn Alloys (<i>x</i> = 2, 5, 8 mass%)

2016

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The effect of microstructure on the stress corrosion behavior of Mg-Sn alloys was investigated using a bent-beam method. The effects of an Mg 2 Sn phase and Sn in the matrix on stress corrosion were investigated. Mg 2 Sn phase mainly formed at the grain boundary. The volume fraction of the Mg 2 Sn phase increased with increasing Sn content, and the morphology of Mg 2 Sn changed from spherical to a semi-continuous network. The average volume fractions of Mg 2 Sn phase increased from 0.07 ± 0.02% to 5.06 ± 0.92% as the Sn content was increased from 2 to 8 mass%. An increase in the amount of Mg 2 Sn phase increased the pit density, whereas dissolution of the Mg 2 Sn phase into the matrix resulted in decreased pit density. An intergranular cracking mode was observed. The solution heat treatment dissolved the Mg 2 Sn phase and eliminated the micro-galvanic corrosion due to Mg 2 Sn, thereby delaying crack initiation also enhancing stress corrosion resistance. Mg-8%Sn sample through solution heat treatment showed the best stress corrosion resistance.

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“…Stress corrosion cracking (SCC) is known to be an issue for Mg alloys [1][2][3] and this topic has recently received considerable attention [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The reviews by Winzer and co-workers [1][2][3] on the stress corrosion cracking (SCC) of Mg alloys showed that SCC can occur at stresses equal to 50% of the yield stress.…”

Section: Introductionmentioning

confidence: 99%

“…The reviews by Winzer and co-workers [1][2][3] on the stress corrosion cracking (SCC) of Mg alloys showed that SCC can occur at stresses equal to 50% of the yield stress. A continuous second phase along grain boundaries causes intergranular stress corrosion cracking (IGSCC).…”

Section: Introductionmentioning

confidence: 99%

Stress corrosion cracking of high-strength AZ31 processed by high-ratio differential speed rolling

Shi

Kim

Cao

et al. 2015

Journal of Magnesium and Alloys

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Stress corrosion cracking (SCC) in distilled water was studied for AZ31, processed by differential-speed-rolling to different strengths, using Linear Increasing Stress Tests (LISTs). The stress corrosion crack velocity was 5.0 ± 2.5 × 10 −9 m s −1 , independent of applied stress rate and independent of material strength. SCC susceptibility was greater at lower applied stress rates manifest most importantly as a lower threshold stress for stress corrosion crack initiation. SCC susceptibility could be characterised by the ratio of threshold stress to yield stress, which was dependent on processing details and was as low as 0.3.

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Stress Corrosion Cracking of Magnesium Alloys

Cited by 59 publications

References 61 publications

Corrosion and stress corrosion cracking of ultra-high-purity Mg5Zn

Corrosion and stress corrosion cracking of ultra-high-purity Mg5Zn

Effect of Microstructure Factors on Stress Corrosion Behavior of Mg<i>-x</i>Sn Alloys (<i>x</i> = 2, 5, 8 mass%)

Stress corrosion cracking of high-strength AZ31 processed by high-ratio differential speed rolling

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