Application of compocasting and cross accumulative roll bonding processes for manufacturing high-strength, highly uniform and ultra-fine structured Al/SiCp nanocomposite

作者：Ardakani Mohammad Reza Kamali; Khorsand Shohreh; Amirkhanlou Sajjad^*; Nayyeri Mohammad Javad

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014, 592: 121-127.

DOI：10.1016/j.msea.2013.11.006

• Nanocomposites
• Ultra-fine structured materials
• Compocasting
• Cross accumulative roll bonding
• High-strength materials
• Mechanical properties

In order to achieve a refine microstructure along with improvement of mechanical properties of cast All 2 vol% SiCp nanocomposite, cross accumulative roll bonding (CARB) process was employed. Optical and electron microscopies, the Archimedes method, and tensile test were used to evaluate microstructural evolution and mechanical properties of the nanocomposites during CARB cycles. Results showed that the microstructure of the nanocomposite after eight cycles of CARB had homogenous distribution of SiC nanoparticles in aluminum matrix without any remarkable porosity. The results of transmission electron microscopy showed that ultra-fine structured Al/SiCp nanocomposite was successfully achieved by employing eight cycles of CARB technique. Also, the tensile strength and the elongation of the nanocomposite increased as the number of CARB cycles increased. After eight CARB cycles, ultimate tensile strength and the elongation values reached 354 MPa and 6.9%, which were 3.22 and 328 times greater than those of the as-cast nanocomposites, respectively. Strengthening mechanisms were explained by strain hardening, grain refinement, reinforcing role of nanoparticles, uniformity of reinforcement and porosity.

• 出版日期2014-1-13