Effect of microstructure on fatigue behavior of AZ31 magnesium alloy

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

doi:10.1016/j.msea.2006.09.124

Cited by 93 publications

(52 citation statements)

References 6 publications

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“…Depending on their texture, wrought magnesium alloys show unique deformation behavior such as mechanical anisotropy, [2][3][4] pseudoelasticity in compression and tension loading-unloading, [4][5][6][7][8] and asymmetricity of stress-strain hysteresis loops in strain controlled low-cycle fatigue tests [9][10][11][12][13][14] and even in load controlled high-cycle fatigue tests, 4,9) etc. The orientation dependence of fatigue crack propagation behavior of magnesium single crystals, [15][16][17] and the effect of grain size [18][19][20][21] and texture [22][23][24][25] on fatigue properties of polycrystalline magnesium alloys have been reported in previous works. However, the effect of texture on the fatigue crack propagation behavior of textured polycrystalline magnesium alloys is still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

et al. 2010

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This paper describes the fatigue crack propagation behavior of rolled and extruded AZ31B magnesium alloys (grain size: approximately 20 and 15 mm, respectively). Fatigue crack propagation tests were performed on center cracked plate tension specimens at a stress ratio of R ¼ 0:1 and a frequency of 10 Hz at room temperature. Loading axes were parallel to the rolling and extrusion directions; fatigue cracks propagated parallel to the transverse direction (L-T specimen of rolled AZ31B), parallel to the short transverse direction (L-S specimen of rolled AZ31B), and perpendicular to the extrusion direction (E-R specimen of extruded AZ31B). The crack growth rate (da=dN) of the L-S specimen was approximately 10 times lower than that of the L-T specimen in the examined stress intensity factor (ÁK) range. Fracture surfaces of the L-T and L-S specimens showed many steps parallel and perpendicular, respectively, to the macroscopic crack growth direction. The plot of the da=dN versus the ÁK range for the E-R specimen shows two regimes with different slopes in the examined ÁK range. The fracture surface was covered by various directional steps independent of macroscopic crack growth direction, and the fracture surface roughness at low ÁK was larger than that at high ÁK. SEM-EBSD observations revealed that the c-axis direction is unfavorable for the fatigue crack propagation in rolled AZ31B magnesium alloy. Free deformation twins were observed around the fatigue crack path in the L-T, L-S, and E-R specimens.

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Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

et al. 2010

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“…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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“…2(a), the microstructures of unpeened ZK60-T5 consisting of fine grains (about 9 mm) in the region A and banded microstructure in the region B are the same as typical magnesium alloy extruded structures, appearing as parallel layers and marking out the deformation flow-lines evidently. 18,19) Analysis of the composition of each layer was done using EDX analysis. The region A is composed of 95.5Mg-3.4Zn-1.1Zr (at%, primary -Mg), and the region B consists of a mixture of the intermetallic phase of 54.8Mg-35.5Zn-9.7Zr (at%) and - Mg. Figure 2(b) shows a micrograph of the layer in a depth of about 30 mm from the top surface layer of shot-peened specimen.…”

Section: Methodsmentioning

confidence: 99%

Effect of Shot Peening on Surface Characteristics and Fatigue Properties of T5-Treated ZK60 Alloy

et al. 2009

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The effects of shot peening on surface characteristics and high cycle fatigue (HCF) performance of T5-treated high-strength magnesium alloy ZK60 (named after ZK60-T5) were investigated. The glass bead with an average diameter of 0.35 mm was adopted for shot peening and the Almen intensity was arranged from 0.02 to 0.40 mmN. The surface microstructure and texture of ZK60-T5 are greatly changed by shot peening, and residual compressive stress is produced in the surface deformation layer. The magnesium alloy ZK60-T5 shows a pronounced overpeening effect. A marked improvement in fatigue life is obtained at low Almen intensities, namely the fatigue strength (at 10 7 cycles) increases from 150 to 195 MPa at the optimum Almen intensity of 0.05 mmN. The fatigue crack nucleation site of ZK60-T5 is also found from surface regions to the subsurface.

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Effect of microstructure on fatigue behavior of AZ31 magnesium alloy

Cited by 93 publications

References 6 publications

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

Relationship between Fatigue Strength and Grain Size in AZ31 Magnesium Alloys

Effect of Shot Peening on Surface Characteristics and Fatigue Properties of T5-Treated ZK60 Alloy

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