Fatigue crack initiation of magnesium alloys under elastic stress amplitudes: A review

Wang, B. J.; Xu, Daokui; Wang, S. D.; Han, En‐Hou

doi:10.1007/s11465-018-0482-1

Cited by 42 publications

(12 citation statements)

References 43 publications

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“…Microcracks are the result of an accumulation of twins and slip bands in the softer dendritic α-Mg matrix, which has a higher possibility to deform by having a quarter of the hardness of the Mg 21 Al 3 Ba 2 phase. The fatigue crack initiation of Mg-alloys is also closely related to the deformation mechanisms of twinning [26]. Máthis et al [27] interpreted their results on the investigation of tension-compression asymmetry in Mg by the dominant effect of twinning up to 200 • C and greater slip activity at higher temperatures.…”

Section: Discussionmentioning

confidence: 99%

Observations of Microstructure-Oriented Crack Growth in a Cast Mg-Al-Ba-Ca Alloy under Tension, Compression and Fatigue

Maier

Ginesta

Clausius

et al. 2022

Metals

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DieMag633, a cast Mg-Al-Ba-Ca alloy, was the focus of this study. Brittle interdendritic phases strongly influenced the crack initiation and propagation under quasi-static and fatigue loading. Especially under tensile loading, the material showed a low resistance to failure. Selected fatigue loading sequences were applied to investigate their influence on crack propagation. DieMag633 in this study contained shrinkage cavities and pores of significant size and irregular distribution. Even though pores played a role in initiating the crack, it was mainly influenced by the Ba- and Ca-rich phases, being and staying much harder under deformation than the Mg-matrix. Apart from the fatigue crack propagation region under fatigue loading, there was no transgranular cracking found within the dendritic α-Mg grains. Only under compression did the dendritic α-Mg grains bridge the crack from one brittle phase to another. Transgranular cracking within the compact Ba-rich phase was very pronounced, starting with many microcracks within this phase and then connecting to the macrocrack. The lamellar Ca-rich phase showed also mainly transgranular cracking, but being small lamellae, intergranular cracking was additionally found. The hardness increase under deformation depended on the loading condition; a compression load strain-hardened the material the most. µCT analysis was applied to characterize the amount and location of the shrinkage cavities and pores in the individual gauge length.

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Section: Discussionmentioning

confidence: 99%

Observations of Microstructure-Oriented Crack Growth in a Cast Mg-Al-Ba-Ca Alloy under Tension, Compression and Fatigue

Maier

Ginesta

Clausius

et al. 2022

Metals

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“…In addition, the corrosion resistance of the Ti-4Al-2V-1Mo-1Fe alloy was slightly higher than the Ti-6Al-4V alloy, which was mainly due to the fact that the Ti-4Al-2V-1Mo-1Fe alloy contained Mo elements, making the passive film more stable [39]. Figure 10 shows typical tensile curves of the Ti-6Al-4V and Ti-4Al-2V-1Mo-1Fe alloys.…”

Section: Alloymentioning

confidence: 99%

Corrosion and Tensile Behaviors of Ti-4Al-2V-1Mo-1Fe and Ti-6Al-4V Titanium Alloys

Qiao

Wang

et al. 2019

Metals

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X-ray diffraction (XRD), scanning electron microscope (SEM), immersion, electrochemical, and tensile tests were employed to analyze the phase constitution, microstructure, corrosion behaviors, and tensile properties of a Ti-6Al-4V alloy and a newly-developed low cost titanium alloy Ti-4Al-2V-1Mo-1Fe. The results showed that both the Ti-6Al-4V and Ti-4Al-2V-1Mo-1Fe alloys were composed of α and β phases. The volume fractions of β phase for these two alloys were 7.4% and 47.3%, respectively. The mass losses after 180-day immersion tests in 3.5 wt.% NaCl solution of these alloys were negligible. The corrosion resistance of the Ti-4Al-2V-1Mo-1Fe alloy was higher than that of the Ti-6Al-4V alloy. The tensile tests showed that the Ti-4Al-2V-1Mo-1Fe alloy presented a slightly higher strength but a lower ductility compared to the Ti-6Al-4V alloy.

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“…Fatigue strength assessment of notch has been attracted much attention from many global famous scholars and a lot of strength assessment models have been built in the last decades. [20][21][22][23][24] In fatigue analysis for the notched component, although the most common approaches used in engineering application, such as nominal stress criterion [25][26] and local stress-strain criterion [27][28], are straightforward and efficient, many studies also showed reliability and accuracy of them were unstable for some conditions. [29][30][31] It is just because fatigue failure for component with stress concentration will not occur in a single peak point of stress ,but in a certain high stress region.. From the point of view, Yao [32] proposed a new equivalent stress calculation criterion, named stress field intensity approach which can consider the effect of loading condition, notch shape and size on fatigue characteristic, to calculate the fatigue damage parameter of notch according to the fatigue failure mechanism of material.…”

Section: Introductionmentioning

confidence: 99%

Surface Roughness Effect on Fatigue Strength of Aluminum Alloy Using Revised Stress Field Intensity Approach

Zhao

Song

Xie

et al. 2021

Preprint

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The fatigue strength of component is known to highly depend on its surface quality and it is very necessary to develop a reliable appropriate mathematical model for fatigue strength assessment considering the effect of surface roughness. In this paper, different underlying physical mechanisms of roughness effect at different regions of specimen were studied by the fatigue test of 7N01 aluminium alloy. For quantitative analysis of the surface roughness effect, a revised stress field intensity approach for fatigue strength assessment of micro-size notch was proposed as the theoretical support. In the new model, a new form of weight function was built to adapt the characteristics of micro-size notch. In addition, the effect of the field radius is weakened fundamentally on solution of the stress field intensity and the difficulty of fatigue failure region definition in traditional method is overcome correspondingly in the proposed model, which makes the calculated field strength accurate and objective. Finally, to demonstrate the validity of the revised approach quantitatively, specimens with notches in conventional size have been subjected to stress field intensity calculation. The results show that the revised approach has a satisfactory accuracy compared with the other two traditional approaches from the perspective of quantitative analysis.

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Fatigue crack initiation of magnesium alloys under elastic stress amplitudes: A review

Cited by 42 publications

References 43 publications

Observations of Microstructure-Oriented Crack Growth in a Cast Mg-Al-Ba-Ca Alloy under Tension, Compression and Fatigue

Observations of Microstructure-Oriented Crack Growth in a Cast Mg-Al-Ba-Ca Alloy under Tension, Compression and Fatigue

Corrosion and Tensile Behaviors of Ti-4Al-2V-1Mo-1Fe and Ti-6Al-4V Titanium Alloys

Surface Roughness Effect on Fatigue Strength of Aluminum Alloy Using Revised Stress Field Intensity Approach

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