Effect of Milling Time on Structural Evolution and Mechanical Properties of Garnet Reinforced EN AW6082 Composites
- PDF / 2,313,786 Bytes
- 14 Pages / 593.972 x 792 pts Page_size
- 83 Downloads / 202 Views
NTRODUCTION
IN the last few years, materials design and development has witnessed a considerable emphasis on strength to weight ratio, environment friendliness and cost of materials along with their better properties and performance.[1,2] Aluminum matrix composites (AMCs), which are considered to be one of such promising materials, have been widely investigated and are attracting unprecedented interest due to their possible application in high performance structural and functional components.[3–7] The properties of AMCs can be tailored by suitable combinations of the matrix alloy, type of reinforcement and processing routes to meet specific applications. This makes these composites unique in comparison to conventional unreinforced materials.[3] Development of new processing techniques such as powder metallurgy, ultrasonic assisted casting, and friction stir casting are being used for the production of AMCs. However, powder metallurgy, employing mechanical alloying during high-energy ball milling, is considered as a promising route. This technique ensures a homogenous distribution of refined hard reinforcement particles and significant grain size refinement of matrix alloy by the repeated welding and fracturing.[8] M. RAVIATHUL BASARIYA, Doctoral Student, is with the CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India, and also with the Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India. V.C. SRIVASTAVA, Principal Scientist, is with the CSIR-National Metallurgical Laboratory. Contact e-mails: [email protected]; [email protected] N.K. MUKHOPADHYAY, Professor, is with the Department of Metallurgical Engineering, Indian Institute of Technology (BHU). Manuscript submitted August 19, 2014. METALLURGICAL AND MATERIALS TRANSACTIONS A
Various types of materials, ranging from typical ceramic hard reinforcements, such as SiC, Al2O3, B4C, and TiB2[9–12] to more unconventional reinforcements, such as intermetallics,[13] metallic glasses,[14] quasicrystals[15], and carbon nanotubes[16] have been successfully used as reinforcements in AMCs through mechanical alloying/ mechanical milling (MM) route. The 6xxx series of Al-Mg-Si alloys have a wide range of industrial applications due to their excellent mechanical properties, good joining ability, corrosion resistance, low density, and good workability. Therefore, these alloys are considered as suitable material for structural applications. On the other hand, garnet, an industrial by-product of the rare earth oxide extraction from beach sand, has been found to be one of the potential reinforcement options. As garnet is cheap, abundantly available and has a Moh’s hardness of 6.5 to 7.0, which is nearly equal to that of SiC, it can be used as a suitable reinforcement for Al matrix composite. Khadem et al.[9] showed that the addition of hard SiC particles accelerates the effect of milling process, leading to faster work hardening rate and fracture of aluminum matrix. Furthermore, aluminium shows better crystallite size refin
Data Loading...
