In-situ Mg2Si/Al-Si-Cu composite modified by strontium

Yú, Zhao; Qin, Qun; Liang, Yunhong; Zhou, Wei; Jiang, Qi‐Chuan

doi:10.1007/s10853-005-0705-9

Cited by 59 publications

(32 citation statements)

References 9 publications

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“…However, some of them exist some inherent defect, for example, potassium fluotitanate [5] addition just decreases its size, while its morphology does not change; in addition, although sodium salt [1] addition can change the morphologies and sizes, the amount of addition is too high (10%). In addition, previous study [7] shows that primary Mg 2 Si morphologies can be modified from dendritic to polygon with 0.05 wt.% Sr addition. However, the further work did not carry out, such as the effect of strontium content and the Mg 2 Si particle morphology evolution, etc.…”

Section: Introductionmentioning

confidence: 84%

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Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

Qin

Zhao

Liu

et al. 2008

Journal of Alloys and Compounds

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116

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Section: Introductionmentioning

confidence: 84%

“…The process of cubic Mg 2 Si particles forming was discussed. To this end, both extracted and sectioned particles have been studied at higher resolutions than in previous investigations [7].…”

Section: Introductionmentioning

confidence: 99%

Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

Qin

Zhao

Liu

et al. 2008

Journal of Alloys and Compounds

Self Cite

116

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“…Therefore, composites with a predominantly coarse primary Mg 2 Si crystal must be modi ed to ensure adequate mechanical strength and ductility 5) . Recently, it was reported that modi cation of microstructure has been developed through common gravity casting by additions of mischmetal 7) , strontium 8,9) or phosphorus 5,10) . After modi cation, the morphology of primary Mg 2 Si phase changed from dendritic or irregular to polygonal or quadrangular shape.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sr+Ce on Microstructure and Abrasive Resistance of <i>In-Situ</i> Mg<sub>2</sub>Si/Al-Si-Cu Composites

Qin

Li²

2016

Mater. Trans.

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In the present study, the modi cation effect of Sr+Ce in Mg 2 Si/Al-Si-Cu composites was investigated for controlling both the microstructure and mechanical properties. Furthermore, the hardness and the abrasive resistance after modi cation were also studied. The results show that when the composites were modi ed by 0.40 mass% Ce, the morphology of the primary Mg 2 Si phase changes to a polygonal morphology with a size of 15 μm. However, in those with a 0.40 mass% Ce and 0.05 mass% Sr addition, the morphology changes to an irregular and equiaxed shape, and the size increases to 50 μm. Furthermore, in the 0.40 mass% Ce and 0.10 mass% Sr addition, the primary Mg 2 Si morphology transforms to a rectangular trapezoid, or T shape, with sizes measuring 70 μm. Additionally, in the 1.00 mass% Ce and 0.05 mass% Sr, and the 1.00 mass% Ce and 0.10 mass% Sr addition, the primary Mg 2 Si morphologies become either polygonal or irregular shaped, respectively. The eutectic phases change shows that, with the addition of Ce or Sr, the eutectic phases exist in the form of the binary eutectic of Al+Mg 2 Si or the ternary eutectic of Al+Mg 2 Si+Si. The hardness test illustrates that the hardness of the 1.00 mass% Ce and 0.05 mass% Sr and the 0.40 mass% Ce and 0.05 mass% Sr, modi ed composites are higher than the unmodi ed composites. The abrasive resistance data shows that modi ed composites with the 1.00 mass% Ce and 0.05 mass% Sr are higher than that of the modi ed and unmodi ed composites with a 0.40 mass% Ce and 0.05 mass% Sr. The abrasive resistance agrees with the hardness test results, and this demonstrates that the Sr+Ce addition can change the microstructure and enhance the mechanical properties of the material.

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“…Other efforts have been focused on the modification of the structure with addition of different alloying elements such as Sr, Ce, sodium salt (assumed to introduce Na), K 2 TiF 6 , and extra silicon content. [7][8][9][10][11] Rare earth elements have also been reported to be capable of modifying the primary Mg 2 Si particles. [12] Recently, P was added to the composite and the results show a great change in size and morphology of primary particles and a transition from flakes to fibers in the eutectic structure.…”

Section: Introductionmentioning

confidence: 99%

Modification of Cast Al-Mg2Si Metal Matrix Composite by Li

Hadian

Emamy

Campbell

2009

Metall Mater Trans B

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The effects of both Li modification and cooling rate on the microstructure and tensile properties of an in-situ prepared Al-15 pct Mg 2 Si composite were investigated. Adding 0.3 pct Li reduced the average size of Mg 2 Si primary particles from~30 to~6 lm. The effect of cooling rate was investigated by the use of a mold with different section thicknesses from 3 to 9 mm. The results show a refinement of primary particle size as a result of both Li additions and cooling rate increases, and their effects are additive. Similarly, both effects increased ultimate tensile stress (UTS) and elongation values. The thin sections show somewhat unexpectedly low and scattered tensile results attributed to the casting defects observed in fracture surfaces. The Li-modified alloy displays serrated yielding behavior that is not fully explained here. The refinement by Li and enhanced cooling rate is explained in terms of an analogy with the effect of Sr and cooling rate in Al-Si alloys, and is ultimately attributed to the effect of the alkali and alkaline earth metals deactivating oxide double films (bifilms) suspended in Al melts as favored substrates for intermetallics.

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In-situ Mg2Si/Al-Si-Cu composite modified by strontium

Cited by 59 publications

References 9 publications

Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

Strontium modification and formation of cubic primary Mg2Si crystals in Mg2Si/Al composite

Effects of Sr+Ce on Microstructure and Abrasive Resistance of <i>In-Situ</i> Mg<sub>2</sub>Si/Al-Si-Cu Composites

Modification of Cast Al-Mg2Si Metal Matrix Composite by Li

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