Scanning probe microscope observations of fatigue process in magnesium alloy AZ31 near the fatigue limit

Nan, Z.Y.; Ishihara, Sotomi; Goshima, Takahito; Nakanishi, Ryosuke

doi:10.1016/j.scriptamat.2003.11.007

Cited by 37 publications

(23 citation statements)

References 3 publications

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“…The solid curve in the figure indicates the approximated S-N curve for the three types of specimens. The dashed line in the figure represents the S-N curve previously reported by the present authors [8] using similar AZ31 magnesium specimens with polished surfaces. The curve was added to make up for limited experimental data of the polished specimen.…”

Section: Experimental Methodssupporting

confidence: 51%

Improvement in Corrosion Fatigue Resistance of Mg Alloy Due to Plating

Notoya¹,

Namito²,

Ishihara³

2011

Magnesium Alloys - Corrosion and Surface Treatments

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Section: Experimental Methodssupporting

confidence: 51%

Improvement in Corrosion Fatigue Resistance of Mg Alloy Due to Plating

Notoya¹,

Namito²,

Ishihara³

2011

Magnesium Alloys - Corrosion and Surface Treatments

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“…The fatigue limits were about 70% of the 0.2% proof strengths in all of the specimens. Several authors 1,2,5) have reported that fatigue limits obtained from the fatigue tests with R ¼ À1 correspond to about 60% of 0.2% proof strengths in AZ31B alloys. The ratio (fatigue limit/0.2% proof strength) in this study was about 10% higher than those in the references.…”

Section: Methodsmentioning

confidence: 99%

“…Fatigue properties of the AZ31 alloys have been reported. [1][2][3][4] However, the studies on the effect of the grain size on the fatigue properties in the Mg alloys are still quite limited. 5,6) Uematsu et al 5) have reported the effects of the grain size smaller than 10 mm on the fatigue properties in extruded AZ31B alloys.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Fatigue Strength and Grain Size in AZ31 Magnesium Alloys

et al. 2008

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The effects of the grain size on the fatigue fracture behaviors in extruded AZ31B alloys were investigated. The mean grain sizes are 4.7 mm in F-specimen, 15 mm in M-specimen and 23 mm in C-specimen, respectively. The fatigue tests with R ¼ À1 were carried out with a plane fatigue bending machine, which was originally developed for thin sheet specimen. S-N curves show that the fatigue limit of the F-, the M-and the C-specimens were estimated as 160 MPa, 150 MPa and 150 MPa, respectively. The F-specimen had the highest fatigue limit in the present alloys. On the other hand, the fatigue life in low cycle region of the F-specimen is shorter than those of the M-and C-specimens. Striation-likepatterns were observed on the fracture surfaces in all of the specimens, although the grain sizes were different. Twin was not observed in the Fspecimen, but it was near the crack in the C-specimen. Consequently, twinning under the fatigue test depends on the grain size, and it affects the fatigue life of AZ31B alloys.

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“…Such behaviors are related to the hexagonal closepacked shape crystals and the limited slip systems characteristic of wrought magnesium alloys. The asymmetry of these alloys is also the result of twinning deformation that depends on the direction of loading with respect to the crystals arrangement [4]. The yield and hardening asymmetry of magnesium alloys results in asymmetric hysteresis and non-Masing behavior.…”

Section: Introductionmentioning

confidence: 99%

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

Kalatehmollaei

Mahmoudi-Asl

Jahed

2014

International Journal of Fatigue

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Due to different deformation mechanisms arising from limited slip systems in HCP wrought magnesium alloys, their yield and hardening in tension and compression are different. Consequently, the cyclic behavior of these alloys is asymmetric showing a non-Masing hysteresis. An elastic-plastic method of analysis is proposed in this paper to handle the pronounced asymmetry inherited by Mg wrought alloys. Samples machined from an extrusion piece of AZ31B were tested on a standard rotating bending machine at bending moment amplitudes ranging from 3.3 to 6.3 N·m. Tests were conducted under two conditions: as-extruded and stress-relived. As-extruded samples showed a higher fatigue limit due to beneficial residual stresses induced by the extrusion process. The proposed elasticplastic model was then applied to obtain the stress distribution in the tested specimens. Cyclic hystereses obtained from this analysis were used to estimate the elastic and plastic strain energy densities per cycle. An energy-life model for AZ31B was then employed in conjunction with the calculated hysteresis energies to predict fatigue life of AZ31B in rotating bending. The proposed model prediction results were in good agreement with the experimental results.

show abstract

Scanning probe microscope observations of fatigue process in magnesium alloy AZ31 near the fatigue limit

Cited by 37 publications

References 3 publications

Improvement in Corrosion Fatigue Resistance of Mg Alloy Due to Plating

Improvement in Corrosion Fatigue Resistance of Mg Alloy Due to Plating

Relationship between Fatigue Strength and Grain Size in AZ31 Magnesium Alloys

An asymmetric elastic–plastic analysis of the load-controlled rotating bending test and its application in the fatigue life estimation of wrought magnesium AZ31B

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