Effects of Mn content and texture on fatigue properties of as-cast and extruded AZ61 magnesium alloys

Sajuri, Zainuddin; Miyashita, Yukio; Hosokai, Yasunobu; Mutoh, Yoshiharu

doi:10.1016/j.ijmecsci.2005.09.003

Cited by 137 publications

(64 citation statements)

References 27 publications

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“…Recent work has shown the important influence of texture on fatigue life in magnesium alloys (Bernard et al 2010, Sajuri et al 2006Chamos et al 2008). Similar conclusions were drawn for other HCP metals like titanium alloys (Bache et al 1998;Whittaker et al 2009).…”

Section: Magnesium Alloyssupporting

confidence: 71%

“…The inapplicability of the conventional linear elastic fracture mechanics (LEFM) parameters (i.e., stress intensity factors) to characterize the growth of fatigue cracks on the order of microns in length was evidenced in wrought magnesium alloys (Tokaji et al 2004;Sajuri et al 2006). On the other hand, fatigue cracks on the order of millimeters or greater in length and larger could be satisfactorily characterized by LEFM parameters.…”

Section: Magnesium Alloysmentioning

confidence: 99%

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Analysis of Lightweight Materials for the AM2 System

Allison¹,

Rushing²,

Garcia³

2014

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An analysis was performed on potential materials that could replace the 6061-T6 aluminum alloy currently used in the AM2 airfield matting for the purpose of light-weighting the design. An in-depth analysis was performed on metal and polymer matrix composites. However, neither groups of materials produced a suitable material based on operating conditions of the AM2. Newly developed extruded magnesium alloys were identified that could potentially provide weight savings of 30 to 40% while maintaining the current performance of the AM2. In addition, traditional high-strength aluminum alloys were identified that could provide substantial weight savings. However, manufacturing issues existed due to the high strength of these aluminum alloys. Finally, analysis was performed to determine the cost of manufacturing the AM2 using these alternate materials.

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Section: Magnesium Alloyssupporting

confidence: 71%

Section: Magnesium Alloysmentioning

confidence: 99%

Analysis of Lightweight Materials for the AM2 System

Allison¹,

Rushing²,

Garcia³

2014

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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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“…Fatigue specimens with a gauge length of 8 mm and a gauge diameter of 4 mm were also machined from the extruded bar to make the applied stress axis parallel to the extrusion direction, according to a previous report. 15) Then, the specimens were prepared by polishing their surfaces to a mirror-like finish with emery paper and alumina paste. The deformed microstructures were observed by optical microscopy and an electron backscattered diffraction (EBSD) method.…”

Section: Methodsmentioning

confidence: 99%

“…[5][6][7] Many researchers have investigated the fatigue behavior of wrought magnesium alloys. [8][9][10][11][12][13][14][15][16][17][18][19] The reports show the crack initiation and/or propagation mechanisms [9][10][11][12] and the effect of microstructures such as grain size 12,13) and texture 14,15) on fatigue strength. Fatigue property is often evaluated with a stress ratio of R ¼ 0:1 or À1 during the cyclic-uniaxial test.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behaviors and Microstructures in an Extruded Mg-Al-Zn Alloy

et al. 2008

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Tensile, compression and fatigue tests were carried out on a commercially extruded Mg-Al-Zn alloy having an average grain size of about 15 mm. The tensile and compression tests at room temperature showed that the yield strength in tension was much higher than that in compression. The lower yield strength in compression resulted from its texture. The effects of the mechanical anisotropy on the fatigue behavior and its deformed microstructure were also investigated under a stress ratio of R ¼ 0:1 and À1. The fatigue strength, stress amplitude, at N ¼ 10 7 cycles under R ¼ À1 and 0.1 was about 120 and 90 MPa, respectively. The mechanical properties and the deformed microstructure observations indicated that the formation of deformation twins was related to the between maximum stress and the yield strength in tension and compression: the deformation twins were formed in the sample (maximum stress is higher than the yield strength) and showed no deformation twins in the sample (maximum stress is lower than the yield strength).

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Effects of Mn content and texture on fatigue properties of as-cast and extruded AZ61 magnesium alloys

Cited by 137 publications

References 27 publications

Analysis of Lightweight Materials for the AM2 System

Analysis of Lightweight Materials for the AM2 System

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

Fatigue Behaviors and Microstructures in an Extruded Mg-Al-Zn Alloy

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