Formation of highly thermal stable Al88Ni6Y6 amorphous composite by graphene addition design. (15th September 2015)

• Record Type: Journal Article
• Authors: Sun, Zhenxi; Xing, Qi; Axinte, Eugen; Ge, Wenjuan; Leng, Jinfeng; Wang, Yan
• Is Part Of: Materials & design. Volume 81(2016:May)
• Page Start: 59
• Page End: 64
• Publication Date: 2015-09-15
• Subjects: Graphene -- Thermal stability -- Mechanical alloying -- Amorphous composite -- Al-based alloy; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2015.05.028
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract : Graphical abstract: Highlights: A new Al-based amorphous composite with graphene (Gr) addition was fabricated. Moderate Gr addition benefits the amorphisation behavior of as-milled AlNiY powders. Gr addition obviously enhanced the thermal stability of Al-based amorphous composite. Special structure of Gr is important factor to explain ultrahigh thermal stability. Abstract: We study the effect of graphene (Gr) addition on the amorphisation and thermal stability of the Al88 Ni6 Y6 + 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 Al88 Ni6 Y6 alloys to begin to transform into crystals, indicating the Gr addition design enhances the thermal stability of the as-milled Al88 Ni6 Y6 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.