Effect of strain ratio and strain rate on low cycle fatigue behavior of AZ31 wrought magnesium alloy

Begum, S.; Chen, D.L.; Xu, Su; Luo, Alan A.

doi:10.1016/j.msea.2009.04.051

Cited by 151 publications

(127 citation statements)

References 45 publications

Supporting

Mentioning

111

Contrasting

Unclassified

Order By: Relevance

“…On the other hand, basal planes are distributed parallel to the extrusion direction by extrusion. 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.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

et al. 2010

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

et al. 2010

View full text Add to dashboard Cite

show abstract

“…In Mg 9 of 12 alloys their formation is generally associated with the dislocation slip and twinning mechanisms in the plastic zone ahead of the fatigue crack tip [4,6,44]. In this region also secondary transgranular cracks are clearly visible, as shown by representative OM images on longitudinal sections of fatigue samples ( Fig.…”

Section: Fracture Surfaces Analysismentioning

confidence: 87%

Fatigue Behavior of the Rare Earth Rich EV31A Mg Alloy: Influence of Plasma Electrolytic Oxidation

Ceschini¹,

Morri²,

Angelini³

et al. 2017

Preprint

View full text Add to dashboard Cite

Rare earth rich magnesium alloys are used in aerospace and automotive fields because of their high specific strength and good castability. However, due to their low corrosion resistance, protective surface treatments, such as conversion coating or electroless plating are necessary, when they have to be used in humid or corrosive environments. The present study was aimed to evaluate the effect of Plasma Electrolytic Oxidation (PEO) and different surface roughness on the rotating bending fatigue of an innovative Mg alloy, with a high content of Nd (up to 3.1 wt%) and Gd (up to 1.7 wt %). Fatigue tests revealed a 15% decrease in the fatigue strength of the PEO treated alloy with respect to the bare alloy, probably due to the residual tensile stresses induced by the treatment. The effect of surface roughness on the bare alloy was, instead, negligible. The mechanisms of crack initiation were similar in the untreated and PEO treated alloy, with crack nucleation sites located in correspondence of large facets of the cleavage planes.

show abstract

“…Plastic strain amplitudes and mean stresses increased as the total strain amplitude increased and were typical observation for these alloys. Regarding traditional fatigue modeling methods, the conventional Coffin-Manson law and Basquin's equation were found to correlate with the experimental fatigue results of these alloys (Begum et al 2008;Begum et al 2009a;Begum et al 2009b;Lin and Chen 2008a;Lin and Chen 2008b;Hasegawa et al 2007). Furthermore, analysis of the current body of literature on fatigue of wrought magnesium alloys suggests that a multistage fatigue approach, which is based in part on Suresh's (1998) classification of fatigue damage of metals and originally developed for FCC structures such as aluminum and austenitic steels, could be extended to capture the fatigue behavior of magnesium alloys.…”

Section: Magnesium Alloysmentioning

confidence: 91%

“…Other studies (Begum et al 2008;Begum et al 2009a;Begum et al 2009b;Lin and Chen 2008a;Lin and Chen 2008b;Hasegawa et al 2007) on fatigue of wrought magnesium alloys did not explicitly report on the sources of fatigue incubation. However, persistent slip bands and grain boundaries sliding are also thought to be a source of fatigue crack initiation in magnesium alloys (Begum et al 2008;Begum et al 2009a;Begum et al 2009b;Lin and Chen 2008a;Gall et al 2004a).…”

Section: Magnesium Alloysmentioning

confidence: 99%

“…Some cyclic tests were recently performed on extruded AM30 (Bernard et al 2010;Begum et al 2008) and AZ31 (Begum et al 2009a;Begum et al 2009b;Lin and Chen 2008a;Lin and Chen 2008b;Hasegawa et al 2007, Jordon et al 2011) alloys in an effort to understand the mechanisms underlying fatigue in wrought magnesium alloys. These materials were found to have marked cyclic hardening characteristics.…”

Section: Magnesium Alloysmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Lightweight Materials for the AM2 System

Allison¹,

Rushing²,

Garcia³

2014

View full text Add to dashboard Cite

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.

show abstract

Effect of strain ratio and strain rate on low cycle fatigue behavior of AZ31 wrought magnesium alloy

Cited by 151 publications

References 45 publications

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

Fatigue Crack Propagation Behavior of Textured Polycrystalline Magnesium Alloys

Fatigue Behavior of the Rare Earth Rich EV31A Mg Alloy: Influence of Plasma Electrolytic Oxidation

Analysis of Lightweight Materials for the AM2 System

Contact Info

Product

Resources

About