Mechanical behavior of ultrafine-grained Al composites reinforced with B4C nanoparticles

作者：Zhang Zhihui^*; Topping Troy; Li Ying; Vogt Rustin; Zhou Yizhang; Haines Chris; Paras Joseph; Kapoor Deepak; Schoenung Julie M; Lavernia Enrique J

来源：Scripta Materialia, 2011, 65(8): 652-655.

DOI：10.1016/j.scriptamat.2011.06.037

• Nanocomposite
• Ultrafine grained microstructure
• Powder consolidation
• Ductility
• Cryomilling

The influence of nanoscale reinforcement on the mechanical behavior of ultrafine-grained composites was studied. Al 5083 (Al-4.5 Mg-0.57Mn-0.25Fe) composites, with grain size of 115 nm and B4C reinforcement size of 38 nm, were fabricated via cryomilling and consolidation. The result reveals that the presence of nanoparticles enhances strength by interacting with dislocations, while simultaneously retarding grain growth. Furthermore, the nanoparticles-reinforced composite exhibits enhanced plasticity relative to the same material reinforced with micrometric particles. The underlying mechanisms are discussed.

• 出版日期2011-10