Stress corrosion cracking of an extruded magnesium alloy (ZK21) in a simulated body fluid

Jafari, Sajjad; Raman, R.K. Singh; Davies, Chris

doi:10.1016/j.engfracmech.2018.09.002

Cited by 50 publications

(27 citation statements)

References 25 publications

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“…Additionally, SCC can even occur in the presence of residual stress that accumulates during thermal-mechanical processing without externally applied stress. Jadari et al [172] have observed that the fracture morphologies of extruded Mg2Zn1Zr (in wt.%) alloy, immersed in modified simulated body fluid (m-SBF) and then strained in air, are similar to those strained directly in m-SBF. The SCC of the pre-immersion sample is ascribed to the residual stress developed during the extrusion processing.…”

Section: Influence Of Environment On the Corrosion Behaviormentioning

confidence: 99%

The Corrosion Performance and Mechanical Properties of Mg-Zn Based Alloys—A Review

Jiang

Blawert

Zheludkevich

2020

CMD

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Magnesium alloys have shown great potential for applications as both structural and biomedical materials due to their high strength-to-weight ratio and good biodegradability and biocompatibility, respectively. Among them, Mg-Zn based alloys are attracting increasing interest for both applications. As such, this article provides a review of the corrosion performance and mechanical properties of Mg-Zn based alloys, including the influence of environment and processing on both of them. The strategies for tailoring corrosion resistance and/or mechanical properties by microstructure adjustment and surface treatment are discussed.

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Section: Influence Of Environment On the Corrosion Behaviormentioning

confidence: 99%

The Corrosion Performance and Mechanical Properties of Mg-Zn Based Alloys—A Review

Jiang

Blawert

Zheludkevich

2020

CMD

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“…The samples were cleaned with ethanol prior to testing. It is worth noting that, differently from other works on this field [29,31,49], the gauge length of the specimen was not grounded prior to testing, in order to avoid the removal of the surface features induced by the cryogenic machining. SSRTs were repeated three times for reproducibility.…”

Section: Slow Strain Rate Tests (Ssrt)mentioning

confidence: 99%

“…Corrosion-assisted cracking phenomena, such as stress corrosion cracking (SCC) and corrosion fatigue (CF), were in fact reported to cause the failure of several traditional implants [25][26][27][28]. In particular, SCC is particularly dangerous because it leads to a sudden and catastrophic failure under mechanical loadings otherwise considered safe, and Mg and its alloys are particularly susceptible [29][30][31]. Therefore, it is important to develop Mg-based implants granting both strength and corrosion resistance in the human body without causing corrosion-assisted cracking phenomena.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of stress corrosion cracking of AZ31 magnesium alloy in simulated body fluid thanks to cryogenic machining

Peron

Bertolini

Ghiotti

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Magnesium and its alloys have recently attracted great attention as potential materials for the manufacture of biodegradable implants. Unfortunately, their inadequate resistance to the simultaneous action of corrosion and mechanical stresses in the human body have hampered their use as implant materials. This work aims at evaluating the Stress Corrosion Cracking (SCC) susceptibility of the AZ31 Mg alloy after being machined under cryogenic cooling. The SCC behaviour was evaluated by means of Slow Strain Rate Tests (SSRTs) in Simulated Body Fluid (SBF) at 37 °C. Prior to testing, a full characterization of the machined surface integrity, including microstructural observations, residual stress, nano-hardness measurements and surface texture analysis was carried out together with the assessment of the corrosion properties through potentiodynamic polarization curves. In addition, the morphology of the fracture surfaces after SSRTs was analysed by means of 3D optical profiler and Scanning Electron Microscopy (SEM). The improved corrosion resistance due to the increased extension of the nano-surface layer and to the compressive residual stresses represents the reason of the reduced SCC susceptibility of cryogenically machined AZ31 samples as compared to dry machined ones.

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“…Jafaria et al. 16 investigated the SCC properties of ZK21 magnesium alloy in a simulated body fluid, the SCC susceptibilities of ZK21 magnesium alloy were high in electrochemical conditions. The SCC behavior of Mg-4Zn alloy in simulated body fluid was investigated in Prabhu et al., 17 the effect of the strain rates on the SCC properties was discussed, and it illustrated that the hydrogen embrittlement was evident with the decreasing strain rate.…”

Section: Introductionmentioning

confidence: 99%

Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

Liang

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The stress corrosion cracking behaviors of micro-arc oxidized AZ31 magnesium alloy were studied by using the slow tensile test in air and 3.5 wt.% NaCl solution. Results showed that compared with the substrate, the stress corrosion cracking susceptibility of the micro-arc oxidized specimens was obvious improved apparently in 3.5 wt.% NaCl solution, due to the good corrosion resistance of the specimens after micro-arc oxidized coating treatment. In addition, regardless of the micro-arc oxidized treatment, it was the mixed fracture in air and the cleavage fracture in 3.5 wt.% NaCl solution. The micro-arc oxidized coating had no direct effect on the fracture mechanism of the alloy. It was closely related to the nature of the material and the environment of the material servicing.

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Stress corrosion cracking of an extruded magnesium alloy (ZK21) in a simulated body fluid

Cited by 50 publications

References 25 publications

The Corrosion Performance and Mechanical Properties of Mg-Zn Based Alloys—A Review

The Corrosion Performance and Mechanical Properties of Mg-Zn Based Alloys—A Review

Enhancement of stress corrosion cracking of AZ31 magnesium alloy in simulated body fluid thanks to cryogenic machining

Stress corrosion cracking behavior of micro-arc oxidized AZ31 alloy

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