Microstructural evolution of the in situ Al-15wt.%Mg2Si composite with extra Si contents

Zhang, J.; Fan, Z.; Wang, Y.Q.; Zhou, Baoxue

doi:10.1016/s1359-6462(00)00338-9

Cited by 81 publications

(25 citation statements)

References 9 publications

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“…In the present study, based on the alloy composition and Al-Mg-Si equilibrium ternary dia- gram [10], the change of eutectic phases (Fig. 2) indicate that Ce addition also lead to a shift of eutectic composition to a higher Mg 2 Si content in in situ Mg 2 Si/Al-Si-Cu composite.…”

Section: Resultssupporting

confidence: 56%

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

Zhao

Qin

Zhou

et al. 2005

Journal of Alloys and Compounds

103

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Section: Resultssupporting

confidence: 56%

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

Zhao

Qin

Zhou

et al. 2005

Journal of Alloys and Compounds

103

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“…In the present study, according to the equilibrium phase diagram of the Al-Mg 2 Si-Mg-Mn alloy (Figure 17), the prior phase is changed to α-AlFeMnSi when Mn concentration is higher than 0.37wt.%. SEM/EDS analysis confirms that the intermetallics is α-AlFeMnSi with a stoichiometry of Al [13][14][15][16][17][18][19][20][21] (Fe,Mn) 1-3 Si 0.25-0.5 . In comparison with the best described α-AlFeMnSi phase, the intermetallics found in the present study contain less Si.…”

Section: Discussion 41 Effect Of Alloying Elements On the Microstrucmentioning

confidence: 96%

“…However, studies of microstructure and mechanical properties of other commonly used aluminium alloying systems under as-cast and heat treatment conditions are limited. The present study attempts to investigate Al-Mg 2 Si (Al-Mg-Si) system because of its attractive advantages [14,15], including the low cost of raw materials, low density of Mg 2 Si and improved mechanical properties. Currently, due to the limitation of alloy composition, Al-Mg 2 Si based alloys are normally cast using permanent mould or sand casting processes.…”

mentioning

confidence: 99%

“…Currently, due to the limitation of alloy composition, Al-Mg 2 Si based alloys are normally cast using permanent mould or sand casting processes. The majority of the existing research on Al-Mg 2 Si alloys are based on hyper-eutectic compositions [14,15]. The development of high strength aluminium alloys based on hypoeutectic Al-Mg 2 Si system not only reduces the weight of existing aluminium castings by reducing the wall thickness, but also provides a heat treatable alloy with a lower solution temperature and shorter solutioning and ageing time.…”

mentioning

confidence: 99%

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Development of a high strength Al–Mg2Si–Mg–Zn based alloy for high pressure die casting

Yan

Fan

2015

Materials Science and Engineering: A

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A high strength Al-Mg 2 Si-Mg-Zn based alloy has been developed for the application in high pressure die casting to provide improved mechanical properties. The effect of various alloying elements on the microstructure and mechanical properties including yield strength, ultimate tensile strength and elongation of the alloy was investigated under the as-cast and heat-treated conditions. The typical composition of the high strength alloy has been optimised to be .%Mg 2 Si-6.0wt.%Mg-3.5wt.%Zn-0.6wt.%Mn (Al-11.0wt.%Mg-2.9wt.%Si-3.5wt.%Zn-0.6wt.%Mn) with unavoidable trace impurities. The mechanical properties of the alloy were enhanced by a quick solution treatment followed by ageing treatment. The improved tensile properties were at a level of yield strength over 300MPa, the ultimate tensile strength over 420MPa and the elongation over 3% assessed using international standard tensile samples made by high pressure die casting. The microstructure of the die-cast alloy consisted of the primary -Al phase, Al-Mg 2 Si eutectics, AlMgZn intermetallics and -AlFeMnSi intermetallics under the as-cast condition. The AlMgZn intermetallic compound was dissolved into the Al-matrix during solution treatment and subsequently precipitated during ageing treatment for providing the effective improvement of the mechanical properties. Key words: aluminium alloys; high pressure die casting; mechanical property; and microstructure. IntroductionHigh pressure die casting (HPDC) is a well-developed manufacturing process and has been extensively used to cast aluminium alloys. In comparison with other casting methods, the advantages of HPDC process include [1,2]: (a) high productivity; (b) good dimensional accuracy and surface finish; (c) capable of providing high volume and economical production; (d) capable of making intricate shapes and thin wall castings; and (e) fine grain microstructure and good mechanical properties. However, the turbulent flow during die filling is an inherent problem in conventional HPDC process. This is fundamental for the formation of the internal defects [ 3,4 ], in particular porosities in die castings. Therefore it has limited the application of die castings as structural components [5,6]. In the past two decades, the application of lightweighting materials in transportation has been the driving force to develop structural components using HPDC process [ 7 ]. The successful development of vacuum assisted HPDC has provided the capability of producing thin-wall castings with much reduced porosities [8]. Therefore, heat treatment is applicable to enhance the mechanical properties of die castings. However, the existing aluminium alloys for HPDC process are mainly based on Al-Si, AlSi-Cu, and Al-Mg-Si systems [9,10]. Most of these alloys are not particularly suitable for the property enhancement by heat treatment, in particular not suitable for solution heat treatment. Although a quick solution treatment has been used for solution treatment of Al-Si-Cu alloys made by HPDC process [11], the currently available...

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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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Microstructural evolution of the in situ Al-15wt.%Mg2Si composite with extra Si contents

Cited by 81 publications

References 9 publications

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

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

Development of a high strength Al–Mg2Si–Mg–Zn based alloy for high pressure die casting

Modification of Cast Al-Mg2Si Metal Matrix Composite by Li

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