Microstructure of the Ce-modified in situ Mg2Si/Al–Si–Cu composite

Zhao, Yi; Qin, Qun; Zhou, Wei; Liang, Yunhong

doi:10.1016/j.jallcom.2004.08.003

Cited by 102 publications

(47 citation statements)

References 10 publications

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“…According to previous study 7) , with the Ce content increased to 0.40% in Mg 2 Si/Al-Si-Cu composites, the sizes of primary Mg 2 Si decreased to ∼15 μm, however, with the Ce content further increased, the sizes of primary Mg 2 Si increased conversely. And with the Ce content increased to 1.00%, the sizes of primary Mg 2 Si did not change obviously 7) .…”

Section: The Modi Cation Of Primary Mg 2 Simentioning

confidence: 51%

“…And with the Ce content increased to 1.00%, the sizes of primary Mg 2 Si did not change obviously 7) . So in the present study, the amount of Ce addition was selected as 0.40% and 1.00%.…”

Section: The Modi Cation Of Primary Mg 2 Simentioning

confidence: 92%

“…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%

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Effects of Sr+Ce on Microstructure and Abrasive Resistance of In-Situ Mg2Si/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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Section: The Modi Cation Of Primary Mg 2 Simentioning

confidence: 51%

“…And with the Ce content increased to 1.00%, the sizes of primary Mg 2 Si did not change obviously 7) . So in the present study, the amount of Ce addition was selected as 0.40% and 1.00%.…”

Section: The Modi Cation Of Primary Mg 2 Simentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Sr+Ce on Microstructure and Abrasive Resistance of In-Situ Mg2Si/Al-Si-Cu Composites

Qin

Li²

2016

Mater. Trans.

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“…most hopeful route to improve the mechanical properties of in-situ composite prepared by simple casting [7] . The modification mechanisms of the Mg 2 Si particles by adding various elements, such as B [8] , Ba [9] , Ca [10,11] , P [12,13] and RE [14][15][16] , have been discussed in previous studies. Generally, there are two major modification mechanisms for primary Mg 2 Si grains.…”

Section: Introductionmentioning

confidence: 99%

Modification effect of calcium-magnesia phosphate fertilizer on microstructure and mechanical properties of Mg2Si/Mg-4Si composite

et al. 2016

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R ecently, metal matrix composites (MMCs) have attracted extensive attention in automobile industry, in order to meet the demands of weight reduction and fuel economization [1][2][3] . The hypereutectic Mg-Si particulate metal matrix composites (PMMCs) have high potential as structural materials because the reinforcing particulate Mg 2 Si intermetallic exhibits a low density of, a high elastic modulus of 120 GPa, a high melting temperature of 1,085 °C, a high hardness of 4.5×10 9 N • m -2 and a low thermal expansion coefficient of. However, as in-situ Mg 2 Si reinforced PMMCs, hypereutectic Mg-Si alloys do not have satisfactory mechanical properties in general, due to the exhibition of coarse dendritic primary Mg 2 Si particles and the brittle Chinese script shape eutectic Mg 2 Si phases [5,6] . It was proposed that a modification process seems to be the Abstract: In order to modify in-situ synthesized Mg 2 Si particles in Mg 2 Si/Mg-4Si composite, the modification effect of calcium-magnesia phosphate fertilizer on primary Mg 2 Si phase in Mg 2 Si/Mg-4Si composite was investigated by means of X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. The results indicate that the morphology of the primary Mg 2 Si phase apparently changes from coarse dendrites to fine dispersive polygonal particles, and the mean size is decreased from 277 μm to 17 μm. With the addition of 4.0wt.% calcium-magnesia phosphate fertilizer as a modifier, the ultimate tensile strength and elongation of the Mg 2 Si/Mg-4Si composite are increased from 78.7 MPa and 2.1% to 105.2 MPa and 2.6%, as compared to those of the base composite, which is probably attributed to the formation of the phosphorous compound and the cluster of Ca compounds that acted as the heterogeneous nucleation substrates of the primary Mg 2 Si particles, resulting in a refined distribution of these precipitates.

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“…Several investigations have been carried out for the modification of primary and eutectic Mg 2 Si crystals in Al-Mg 2 Si or Al-Si-Mg 2 Si composites by adding P [2], Sr [3], and RE, such as Y [4] and Ce [5,6], Li [7], Na [8], and and K [9] to the liquid alloys. Y and Ce have been shown to be an effective modifier of Mg 2 Si.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and dry sliding wear behavior of cast Al–Mg2Si in-situ metal matrix composite modified by Nd

Zhang

2013

Rare Met.

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The microstructure and dry sliding wear behavior of cast Al-18 wt% Mg 2 Si in-situ metal matrix composite modified by Nd were investigated. Experimental results show that, after introducing a proper amount of Nd, both primary and eutectic Mg 2 Si in the Al-18 wt% Mg 2 Si composite are well modified. The morphology of primary Mg 2 Si is changed from irregular or dendritic to polyhedral shape, and its average particle size is significantly decreased. Moreover, the morphology of the eutectic Mg 2 Si phase is altered from flake-like to very short fibrous or dot-like. The wear rates and friction coefficient of the composites with Nd are lower than those without Nd. Furthermore, the addition of 0.5 wt% Nd changes the wear mechanism of the composite from the combination of abrasive, adhesive, and delamination wear without Nd into a single mild abrasion wear with 0.5 wt% Nd.

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Microstructure of the Ce-modified in situ Mg2Si/Al–Si–Cu composite

Cited by 102 publications

References 10 publications

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

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

Modification effect of calcium-magnesia phosphate fertilizer on microstructure and mechanical properties of Mg2Si/Mg-4Si composite

Microstructure and dry sliding wear behavior of cast Al–Mg2Si in-situ metal matrix composite modified by Nd

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