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Zhenxi Sun, Qi Xing, Eugen Axinte , Wenjuan Ge , Jinfeng Leng, Yan Wang. Formation of highly thermal stable Al88Ni6Y6 amorphous composite by graphene addition design. Materials and Design, 81, p. 5964, 2015.

Abstract: We study the effect of graphene (Gr) addition on the amorphisation and thermal stability of the Al88Ni6Y6 + x wt.% Gr (x = 0, 0.2, 0.5, and 0.8) alloys during mechanical alloying. The final milling-products consist of the amorphous phase and a few nanocrystals with face-centered cubic (fcc)structure, and the AlNiY(Gr) amorphous composites have been fabricated. We find that the 0.2 wt.% Gr addition obviously benefits the amorphisation and remarkably enhance the onset crystallization temperature of the alloy. Continuous heating transformation diagram shows that the as-milled Gr additional alloys need longer time than the Al88Ni6Y6 alloys to begin to transform into crystals, indicating the Gr addition design enhances the thermal stability of the as-milled Al88Ni6Y6 alloy. The influence mechanism of Gr addition has been discussed based upon the negative heat of mixing, atomic-size mismatch, diffusion-asymmetry, and special structure of Gr.

Keywords: Graphene, Thermal stability ,Mechanical alloying

URL: http://dx.doi.org/10.1016/j.matdes.2015.05.028

Posted by Eugen Axinte

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