Effect of strain ratio on cyclic deformation behavior of a rare-earth containing extruded magnesium alloy

Mirza, F.A.; Chen, D.L.; Li, D.J.; Zeng, Xiaoqin

doi:10.1016/j.msea.2013.09.023

Cited by 35 publications

(51 citation statements)

References 83 publications

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“…It is seen from Figure 1(a) that uniform equiaxed grains with an average grain size of about 12 lm were obtained in asextruded sample due to the occurrence of dynamic recrystallization (DRX) in the hot extrusion process at 673 K (400°C). [24] The grain size of as-extruded sample was fairly small in comparison with the common extruded Mg alloys, such as AZ31 and AM30, [9][10][11][12][13][14] and the smaller grain size was due to the role of added RE elements and zirconium where Zr mainly restricted the grain growth. [48] Figure 1(b) shows a typical SEM back-scattered electron image of as-extruded sample where several RE containing particles can be seen.…”

Section: Resultsmentioning

confidence: 99%

“…One appealing approach of achieving this goal is via alloy composition adjustment, e.g., addition of rare-earth (RE) elements into Mg alloys. [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.…”

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%

“…Microstructures (left optical micrographs and right SEM back-scattered electron images) of the GW103K alloy in the (a)[24] and (b) asextruded, (c) and (d) T5, and (e) and (f) T6 states.…”

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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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Microstructures (left optical micrographs and right SEM back-scattered electron images) of the GW103K alloy in the (a)[24] and (b) asextruded, (c) and (d) T5, and (e) and (f) T6 states.…”

mentioning

confidence: 99%

See 2 more Smart Citations

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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“…Fuel efficiency of passenger vehicles has been reported to be improved by 6-8% for each 10% reduction in weight [1][2][3][4]. Thus vehicle lightweighting is today realized as one of the most important approaches to reduce anthropogenic climate-changing, environment-damaging, costly and human death-causing 1 emissions [5][6][7][8][9][10] because of the huge environmental concerns and mounting global energy demand in the transportation industry.…”

Section: Introductionmentioning

confidence: 99%