Microstructure evolution and mechanical properties of a particulate reinforced magnesium matrix composites forged at elevated temperatures

Deng, Kun-kun; Wu, Kun; Wang, Xiaojun; Wu, Yi; Hu, X.S.; Zheng, M.Y.; Gan, Weimin; Brokmeier, Heinz Günter

doi:10.1016/j.msea.2009.10.053

Cited by 83 publications

(27 citation statements)

References 21 publications

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“…The grain size decreases with the increase of SiC particulates content at certain volume fraction, and then increases with the continuous increase of volume fraction. The minimum value of grain size obtained in certain volume fraction of submicron-SiC particulates could be attributed to two reasons: (1) SiC particulates may induce recrystallisation of the magnesium matrix through stimulation of nucleation at the SiC/Mg interfaces during hot deformation [16,17], and the added SiC particulates could restrict the grain growth as the increasing of volume fraction. (2) The effect of restriction is weakened as the volume fraction of submicron-SiC particulates increased to 5% due to the increasing of agglomerating regions, which lead to the grain growth as the volume fraction continues increasing.…”

Section: Microstructure Observationmentioning

confidence: 99%

Effect of submicron size SiC particulates on microstructure and mechanical properties of AZ91 magnesium matrix composites

Deng

et al. 2010

Journal of Alloys and Compounds

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166

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a b s t r a c tIn the present study, AZ91 magnesium matrix composites reinforced with six volume fractions (0.5, 1, 1.5, 2, 3 and 5 vol.%) of submicron-SiC particulates (0.2 m) were fabricated by stir casting. The as-cast ingots were forged at 420 • C with 50% reduction, and then extruded at 370 • C with the ratio of 16 at a constant ram speed of 15 mm/s. The microstructure of the composites was investigated by optical microscopy, scanning electron microscope and X-ray diffractometer. Microstructure characterization of the composites showed relative uniform reinforcement distribution, significant grain refinement and presence of minimal porosity. The X-ray diffractometer analysis showed that a strong basal plane texture was formed in both AZ91 alloy and SiCp/AZ91 composites during extrusion and the addition of submicronSiC particulates could weaken the basal plane texture. The presence of submicron-SiC particulates assisted in improving the thermal stability, micro-hardness, elastic modulus and 0.2% yield strength. Both of the 0.2% yield strength and ultimate tensile strength increased with the increasing of submicron-SiC particulate content, however, decreased as the SiC particulate content overrun 2 vol.%.

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Section: Microstructure Observationmentioning

confidence: 99%

Effect of submicron size SiC particulates on microstructure and mechanical properties of AZ91 magnesium matrix composites

Deng

et al. 2010

Journal of Alloys and Compounds

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166

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“…5 (a) and (b), it can be found the presence of high-density dislocations and ultra-fine DRX grains near the micron SiCp. Deng's [20] research also reported that high dislocation density accumulates at non-deformable particle in the magnesium matrix containing micron SiCp. Cavaliere et al [21] discussed the recrystallization behavior of the 10 M A N U S C R I P T…”

Section: Microstructures Of Az31b/sicp/m+s+n Compositesmentioning

confidence: 90%

Characteristics and mechanical properties of magnesium matrix composites reinforced with micron/submicron/nano SiC particles

Shen

Wang

Ying

et al. 2016

Journal of Alloys and Compounds

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“…Apart from grain boundaries, SiCp also have pronounced effect on inhibiting dislocation migration and thus lead to the pileup of dislocation around SiCp [16,31]. The increased dislocations can provide favorable conditions for DRX nucleation [15,32], so the X DRX of S-1.5 ? 10-8.5 composite is higher than monolithic AZ91 alloy during the whole compression process.…”

Section: Analysis About the Drx Mechanism Influenced By Bimodal Size mentioning

confidence: 99%

Dynamic Recrystallization Behavior of Bimodal Size SiCp-Reinforced Mg Matrix Composite during Hot Deformation

Wang

Deng

Zhou

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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The (submicron ? micron) bimodal size SiCp-reinforced Mg matrix composite was compressed at the temperature of 270-420°C and strain rate of 0.001-1 s -1 . Then, dynamic recrystallization (DRX) behavior of the composite was investigated by thermodynamic method and verified by microstructure analysis. Results illustrated that the composite possess the lower critical strain and higher DRX ratio as compared to monolithic Mg alloys during hot deformation process. The predicted DRX ratio increased with the proceeding of compression, which was well consistent with the experimental value. Results from thermodynamic calculation suggested that the occurrence of DRX could be promoted by SiCp, which would be further proved by microstructure analysis. Formation of particle deformation zone around micron SiCp played a significant role in promoting DRX nucleation. Nevertheless, the distribution of submicron SiCp was increasingly uniform with the proceeding of compression, which could fully restrain grain growth. Therefore, the corporate effects of micron and submicron SiCp on DRX contributed to the improvement of DRXed ratio and the refinement of grain size for the composite during compression process.

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Microstructure evolution and mechanical properties of a particulate reinforced magnesium matrix composites forged at elevated temperatures

Cited by 83 publications

References 21 publications

Effect of submicron size SiC particulates on microstructure and mechanical properties of AZ91 magnesium matrix composites

Effect of submicron size SiC particulates on microstructure and mechanical properties of AZ91 magnesium matrix composites

Characteristics and mechanical properties of magnesium matrix composites reinforced with micron/submicron/nano SiC particles

Dynamic Recrystallization Behavior of Bimodal Size SiCp-Reinforced Mg Matrix Composite during Hot Deformation

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