Cyclic deformation and fatigue of extruded Mg–Gd–Y magnesium alloy

Wang, Fenghua; Dong, Jie; Jiang, Yanyao; Ding, Wenjiang

doi:10.1016/j.msea.2012.10.048

Cited by 55 publications

(75 citation statements)

References 54 publications

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“…[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] These RE-Mg alloys possess quite random initial crystallographic texture which leads to improved ductility and strength at both room and elevated temperatures via solid solution strengthening and precipitation strengthening. [31,32] It was reported that an RE element alternates the bonding energy between the Mg atom and the RE atom, thus increasing the possibility of non-basal slip and inhibiting the basal slip and f1012g twinning. [32] In other words, RE elements such as Gd, Nd, Ce, and La can work as effective texture modifiers for Mg alloys, and they are able to produce the so-called ''RE texture component'' even at low alloying levels.…”

Section: Introductionmentioning

confidence: 99%

“…[31,32] It was reported that an RE element alternates the bonding energy between the Mg atom and the RE atom, thus increasing the possibility of non-basal slip and inhibiting the basal slip and f1012g twinning. [32] In other words, RE elements such as Gd, Nd, Ce, and La can work as effective texture modifiers for Mg alloys, and they are able to produce the so-called ''RE texture component'' even at low alloying levels. [18][19][20]23,26,27,33] Recent studies reported that due to certain RE concentrations and extrusion parameters there was a shift in the orientation peak of the extrusion textures in the REcontaining alloys from h10À10i to new positions of h11À21i, h11À22i or h20À21i parallel to extrusion direction, which were termed as ''RE texture component''.…”

Section: Introductionmentioning

confidence: 99%

“…[15,[35][36][37][38][39][40][41] Studies on the strain-controlled low-cycle fatigue behavior of RE-containing Mg alloys remain quite scarce to date. [17,24,32,[40][41][42][43][44][45][46][47] For example, Wang et al [32] studied the low-cycle fatigue behavior of extruded Mg-8.0Gd-3.0Y-0.5Zr (GW83) alloy under fully reversed strain-controlled tension-compression loading along the extrusion direction. Wu et al [42] investigated the strain-controlled low-cycle fatigue properties of a Mg-10Gd-2.0Y-0.46Zr alloy at 573 K (300°C).…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Mirza

Chen

et al. 2014

Metall Mater Trans A

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The present study was aimed at evaluating strain-controlled cyclic deformation behavior of a rareearth (RE) element containing Mg-10Gd-3Y-0.5Zr (GW103K) alloy in different states (as-extruded, peak-aged (T5), and solution-treated and peak-aged (T6)). The addition of RE elements led to an effective grain refinement and weak texture in the as-extruded alloy. While heat treatment resulted in a grain growth modestly in the T5 state and significantly in the T6 state, a high density of nano-sized and bamboo-leaf/plate-shaped b¢ (Mg 7 (Gd,Y)) precipitates was observed to distribute uniformly in the a-Mg matrix. The yield strength and ultimate tensile strength, as well as the maximum and minimum peak stresses during cyclic deformation in the T5 and T6 states were significantly higher than those in the as-extruded state. Unlike RE-free extruded Mg alloys, symmetrical hysteresis loops in tension and compression and cyclic stabilization were present in the GW103K alloy in different states. The fatigue life of this alloy in the three conditions, which could be well described by the Coffin-Manson law and Basquin's equation, was equivalent within the experimental scatter and was longer than that of RE-free extruded Mg alloys. This was predominantly attributed to the presence of the relatively weak texture and the suppression of twinning activities stemming from the fine grain sizes and especially RE-containing b¢ precipitates. Fatigue crack was observed to initiate from the specimen surface in all the three alloy states and the initiation site contained some cleavage-like facets after T6 heat treatment. Crack propagation was characterized mainly by the characteristic fatigue striations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Mirza

Chen

et al. 2014

Metall Mater Trans A

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“…Recent studies [7,9,10] have demonstrated that the addition of rare earth (RE) elements, such as Nd, Gd, Y, can remarkably enhance both the tensile and fatigue strength of Mg alloys. In the case of castings, this improvement was related both to the microstructural refinement and to the decreased size and amount of porosity and inclusions induced by RE elements [7,11,12], while in wrought Mg alloys it seems mainly due to the corresponding weakness of crystallographic textures and the reduction of twinning [13][14][15][16]. It was also found that the addition of RE and the reduction of impurities can effectively improve the corrosion resistance of Mg alloys [17][18][19][20].…”

Section: Introductionmentioning

confidence: 95%

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

Ceschini¹,

Morri²,

Angelini³

et al. 2017

Preprint

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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.

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“…Studies [38][39][40][41][42][43][44][45][46][47][48][49][50] were conducted to understand the cyclic deformation and fatigue properties of Mg-RE alloys in the last decade. Wang et al [48] suggested that for an extruded Mg-Gd-Y-Zr alloy, the material displayed near symmetric stress-strain hysteresis loops under fully reversed strain-controlled tensioncompression cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Aging effects on cyclic deformation and fatigue of extruded Mg–Gd–Y–Zr alloy

Dong

Wang

Wan

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tThe aging effects on the deformation and fatigue behavior of extruded Mg-8.0Gd-3.0Y-0.5Zr (GW83) magnesium (Mg) alloy were experimentally studied. The aging process significantly enhances the monotonic strengths under both tension and compression. The ductility under tension is unchanged but the elongation under compression is reduced due to the aging treatment. The cyclic stress-strain curve of the aged GW83 is much higher than that of the corresponding extruded state. The strain-life fatigue curve of the aged GW83 is similar to that of the extruded GW83, but the stress-life fatigue curve of the aged GW83 is much higher, indicating an improved fatigue strength due to the aging process. Similar to the other Mg alloys, a kink point in the strain-life fatigue curve was identified for the aged GW83 Mg alloy, and the kink point of a strain amplitude of 0.80% for the material demarcates the activation of bulk and persistent twinning/detwinning during cyclic deformation. The enhanced fatigue strength is discussed with respect to the observed fragmented persistent slip bands (PSBs) and the inhibition of microcracks by the precipitates in aged GW83.

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Cyclic deformation and fatigue of extruded Mg–Gd–Y magnesium alloy

Cited by 55 publications

References 54 publications

Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

Cyclic Deformation Behavior of a Rare-Earth Containing Extruded Magnesium Alloy: Effect of Heat Treatment

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

Aging effects on cyclic deformation and fatigue of extruded Mg–Gd–Y–Zr alloy

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