Autori: Zhenxi Sun, Qi Xing, Eugen Axinte ,Wenjuan Ge , Jinfeng Leng, Yan Wang

Editorial: Alexander Korsunski, Elsevier, Materials and Design, 81, p.59–64, 2015.

Rezumat:

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.

Cuvinte cheie: Graphene, Thermal stability ,Mechanical alloying

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