Enhanced mechanical properties of Mg–Gd–Y–Zr casting via friction stir processing

Xiao, B.L.; Yang, Qiang; Yang, Jia; Wang, W.G.; Xie, Guobo; Ma, Z.Y.

doi:10.1016/j.jallcom.2010.11.147

Cited by 94 publications

(34 citation statements)

References 33 publications

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“…Figure 1 shows the schematic diagram of the position for measurement of the temperature. To measure the temperature during FSP, a K-type thermocouple with a Mg-10Gd-3Y-0.5Zr 800 50 6.1 312 19 [13] Mg-10Gd-3Y-0.5Zr 800 100 5.6 322 ± 2.1 31 ± 1.5 [14] Mg-9.4Gd-4.1Y-1.2Zn 800 100 *2.4 380 ± 9.9 21.5 ± 3.3 [15] J Mater Sci (2015) 50:3212-3225 3213 diameter of 0.5 mm was inserted into a hole in the middle of the plate in the thickness direction, and the measurement was taken at a 1.5-mm distance from the edges of the pin. A Kistler CoMo injection-type device was used to continuously record the thermal history at a sampling rate of 0.25 s. To ensure a reasonable degree of accuracy, the measurement was repeated three times.…”

Section: Methodsmentioning

confidence: 99%

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Microstructure evolution and mechanical properties of a submerged friction-stir-processed AZ91 magnesium alloy

Chai

Zhang

et al. 2015

J Mater Sci

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AZ91 casting alloy is subjected to friction stir processing (FSP) in air (NFSP) and under water (SFSP). The thermal histories of the two FSP procedures are measured, and their effects on microstructure evolution and mechanical properties of the experimental materials are investigated. Compared with NFSP, the peak temperature during SFSP is about 150°C lower and a much higher cooling rate of 13°C/s is gained. Both NFSP and SFSP produce uniform recrystallized microstructures with dominant high-angle grain boundaries. The average grain size of the NFSP specimen is 7.8 lm, and SFSP results in further grain refinement with a grain size of 1.2 lm. The observed grain sizes of the two FSP specimens match well with the predicted values calculated by the Derby-Ashby model. TEM observation, temperature data, and model criterion indicate that the grain refinement mechanism during NFSP is attributed to continuous dynamic recrystallization (DRX), while continuous DRX and discontinuous DRX affect during SFSP. The mechanical properties of the SFSP alloy are much higher due to finer microstructure.

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Section: Methodsmentioning

confidence: 99%

“…Presently, research on FSP of magnesium alloy has been widely reported (summarized in Table 1) [7][8][9][10][11][12][13][14][15]. According to the different processing parameters, the average grain size of a-Mg varies in the range of 2.5-15 lm.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and mechanical properties of a submerged friction-stir-processed AZ91 magnesium alloy

Chai

Zhang

et al. 2015

J Mater Sci

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“…They also reported that hot extrusion and ageing lead to the very high tensile properties of the alloy as reported in Table 19. Xiao et al [90] investigated the Mg-10Gd-3Y-0.5Zr and reported that the Friction Stir processing (FSP) led to grain refinement and dissolution of the eutectic Mg5(Gd,Y) thereby improving the ductility. Ageing treatments done after the FSP led to the improvement in the strengths.…”

Section: Mg-zr-re Higher Alloy Systemsmentioning

confidence: 99%

Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review

Tekumalla

Seetharaman

Almajid

2014

Metals

179

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Magnesium-rare earth based alloys are increasingly being investigated due to the formation of highly stable strengthening phases, activation of additional deformation modes and improvement in mechanical properties. Several investigations have been done to study the effect of rare earths when they are alloyed to pure magnesium and other Mg alloys. In this review, the mechanical properties of the previously investigated different magnesium-rare earth based binary alloys, ternary alloys and other higher alloys with more than three alloying elements are presented.

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“…Nevertheless, most of the investigations of the Mg-Gd alloys reported superplasticity after simple extrusion [5,6] or friction stir processing (FSP) [7][8][9] and the minimum grain sizes attained by these methods were of the order of 3 m [8]. This suggests that it may be advantageous to evaluate the occurrence of superplasticity in these alloys after processing using severe plastic deformation (SPD) processes where there is a capability of achieving an even greater level of grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Superplasticity of a nano-grained Mg–Gd–Y–Zr alloy processed by high-pressure torsion

Alizadeh

Mahmudi

Ngan

et al. 2016

Materials Science and Engineering: A

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While most of the reports on Mg-Gd-Y-Zr alloys report superplasticity after extrusion or friction stir processing, it is important to investigate superplasticity in these alloys after other severe plastic deformation processes having greater grain refinement capability. Accordingly, superplasticity was studied in an Mg-9Gd-4Y-0.4Zr (GW94) alloy after different high-pressure torsion (HPT) conditions. The HPT was performed at room temperature under an applied pressure of 6.0 GPa for up to 16 turns. TEM microstructural characterization revealed that the grain size was reduced from an initial value of ~8.6 m in the extruded condition to ~95 ± 10 and ~85 ± 10 nm after 8 and 16 turns, respectively. A shear punch testing method was used for evaluation of superplasticity at 573, 623, 673 and 723 K. Maximum strain rate sensitivities of ~0.51 ± 0.05 and ~0.48 ± 0.05 were obtained at 623 K for the material processed through 16 and 8 turns, respectively. This strain rate sensitivity and an activation energy of ~100 ± 5 kJ mol -1 suggests the occurrence of grain boundary sliding in the superplastic region.

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Enhanced mechanical properties of Mg–Gd–Y–Zr casting via friction stir processing

Cited by 94 publications

References 33 publications

Microstructure evolution and mechanical properties of a submerged friction-stir-processed AZ91 magnesium alloy

Microstructure evolution and mechanical properties of a submerged friction-stir-processed AZ91 magnesium alloy

Mechanical Properties of Magnesium-Rare Earth Alloy Systems: A Review

Superplasticity of a nano-grained Mg–Gd–Y–Zr alloy processed by high-pressure torsion

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