Preparation and characterization of In-situ AL-Al3Ni/TiC Nano Composite manufactured by combine FSP and mechanical alloying

this paper presented the synthesis process of TIC/Al3Ni hybrid reinforcement particles via in-situ reaction in Al-matrix to fabricate using friction stir processing (FSP) and mechanical alloying (MA) methods. Two TIC and Al3Ni phases are the result of the combination of Ni-Ti-C powder mixture prepared by MA and distributed into the stir zone of AA1050 alloy. Composition, structure and morphology of the samples were characterized by X-ray diffraction (XRD) of FSPed samples. Surface composite layers were examined by optical microscopy (OM) and field emission scanning electron microscopy (FESEM) for microstructural investigations. Also, the analysis of its chemical composition was investigated by EDS. Effect of heat treatment on the in-situ reaction between constituents was investigated. XRD analysis showed that FSP of Al matrix with incorporating MAed Ni-Ti-C powders that resulted in the in-situ formation of TiC and Al3Ni compounds after 2 passes. After 4 and 6 passes more Al3Ni and TiC particles could be observed within the Al matrix. MAed powders distributed on the face of composite which created after six FSP passes transformed to Al3Ni and TiC compounds after heat treatment at 550 oC. Mechanical properties of composite layers were investigated by microhardness and tensile testing. The results showed that First, the synthesis of the two phases, TIC and AL3Ni, were carried out and had positive effects on the mechanical properties up to about 100% higher than those of the base metal

Keywords:

Microstructure , Hybrid composite , IN-SITU , Mechanical alloying , Powder metallurgy