Nowadays, aluminum composites possess remarkable engineering importance due to their suitable properties. But, because of the welding limitation of these materials, their use has been limited. Aluminum nanocomposites are always more expensive than conventional materials in the industry. Due to the abundance and cheapness of the montmorillonite nanoclay, these particles were used as reinforcing particles in this study. Metallurgy powder and extrusion process was performed for producing of the Al composite sample containing of 0%, 1%, 2%, 6%, and 10% nanoclay. Due to the importance of the aluminum composites bonding, the optimum specimen was joined by transient liquid phase and it is properties have been investigated. Optical and scanning electron microscopes were used for microstructural studies. phase investigation was performed by X-ray diffraction and EDS. Also, mechanical evaluation including tensile and compressive tests, micro and macro-hardness were performed. The results showed that the montmorillonite nanoclay causes to improvement of the nanocomposites mechanical properties by mechanisms such as Orowan and thermal expansion mismatch between reinforcement and Al matrix. Ultimate tensile strengths were increased about 31%, 46%, 62%, and 95% for the composite samples with 1%, 2%, 6%, and 10% nanoclay, respectively. Investigations shows that the experimental yield strength of composite specimens was less than the theoretical yield strength. The reason for this was the presence of porosities, agglomeration phenomenon, and the existence of assumptions in equations. The composite sample with 2% nanoclay was selected as the optimum sample which showed an increase of 63%, 42% and 53% for hardness, tensile and compressive strength, respectively. By adding the nanoclay to the Al matrix, the complete ductile fracture mechanism changed to the shear ductile fracture. The results of the transient liquid phase bonding of the Al-2% nanoclay composite revealed that the concentration of the reinforcements were presenting in the center joint area which it became more homogeneous with increasing the bonding time. Phases investigation shows that Al(?), CuAl 2 , and Si was formed in the bonded area. The copper diffusion to the was approximately 600 µm in each side of the base metal that causes to increasing the hardness of this area from about 60 HVN to 90 HVN. The maximum bonding shear strength of the samples was achieved about 89% of the parent metal for the TLP bonded specimen for 180 min. Key words Aluminum matrix composite,montmorillonite nanoclay, Transient liquid phase(TLP), mechanical properties.