In situ Mg2Si/Al–Si composite modified by K2TiF6

Zhao, Yi; Qin, Qun; Zhao, Yu; Liang, Yuanzhe; Jiang, Qi‐Chuan

doi:10.1016/j.matlet.2004.01.016

Cited by 90 publications

(56 citation statements)

References 12 publications

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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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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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“…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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“…However, there are some defects, such as a high brittleness and a poor cutting property of the material. Some measures, including electromagnetic stirring [11] as well as the addition of RE [12][13], K 2 TiF 6 [14], P [15], NaCl [16] and so on, have been used for improving the morphology and size of Mg 2 Si particles to increase the mechanical properties of the material. In order to decrease the cost of Mg 2 Si modification and obtain a more satisfying effect, the effect of mixed rare earth oxides and carbonate on Mg 2 Si modification is discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Effect of mixed rare earth oxides and CaCO3 modification on the microstructure of an in-situ Mg2Si/Al-Si composite

2009

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The effects of mixed rare earth oxides and CaCO 3 on the microstructure of an in-situ Mg 2 Si/Al-Si hypereutectic alloy composite were investigated by optical microscope, scanning electron microscope, and energy dispersive spectrum analysis. The results showed that the morphology of the primary Mg 2 Si phase particles changed from irregular or crosses to polygonal shape, their sizes decreased from 75 μm to about 25 μm, and the compound of both the oxide and CaCO 3 was better than either the single mixed rare earth oxides or CaCO 3 .

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In situ Mg2Si/Al–Si composite modified by K2TiF6

Cited by 90 publications

References 12 publications

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

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

Modification of Cast Al-Mg2Si Metal Matrix Composite by Li

Effect of mixed rare earth oxides and CaCO3 modification on the microstructure of an in-situ Mg2Si/Al-Si composite

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