Effects of graphene addition on the refinement of silicon phase in graphene/A356.2 composites

•System design of two-dimensional nanophase modified hypereutectic Al-Si alloys.•Low-cost and large-scale preparation of nanocomposite materials.•Achieve efficient refinement of the silicon phase (refinement rate 55.5%).•Composite materials have a balance of high strength and high ductility. The coa...

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Bibliographic Details
Published in:Materials letters 2021-06, Vol.292, p.129610, Article 129610
Main Authors: Leng, Jinfeng, Ren, Binghui, Jin, Yunke, Zhu, Yaqi, Wang, Kang
Format: Article
Language:English
Subjects:
Aluminum base alloys
Cast
Composite materials
Elongation
Graphene
Materials science
Mechanical properties
Nanocomposites
Nucleation
Silicon
Silicon phase refinement
Solidification
Standard components
Ultimate tensile strength
Yield strength
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Summary:•System design of two-dimensional nanophase modified hypereutectic Al-Si alloys.•Low-cost and large-scale preparation of nanocomposite materials.•Achieve efficient refinement of the silicon phase (refinement rate 55.5%).•Composite materials have a balance of high strength and high ductility. The coarse silicon phase makes the mechanical properties of the A356.2 alloy difficult to meet the needs of high-standard components. The influence of graphene addition on the silicon phases refinement and mechanical properties of the graphene/A356.2 composites prepared by stirring casting method was elucidated. Due to the refinement rate of silicon phase of the 0.5 wt% graphene/A356.2 composites (3.59 μm) reached 55.5%, the ultimate tensile strength (UTS: 383.3 MPa), yield strength (YS: 313.4 MPa) and elongation (EL: 5.0%) were increased by 47.4%, 44.3% and 400.0%, respectively. The refinement of silicon phase was mainly attributed to the unique two-dimensional structure and large specific surface area of graphene, which provided an effective nucleation core of the silicon phase during solidification process.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.129610