Effects of original layer thickness ratio on exothermic and mechanical properties of Ni/Al multilayered energetic structural composites

Abstract

Ni/Al multilayered energetic structural composites with micron scale were prepared by electroless plating followed by hot press process. The effects of original layer thickness ratio on the microstructure, exothermic properties and mechanical properties of the fabricated composites were investigated, and then the fracture mechanism was analyzed. The results show that the interface bonding of Ni/Al multilayered energetic structural composites is perfect and the initial temperature of interface reaction increases with the increase of original layer thickness ratios. The 2/3 Ni/Al multilayered energetic structural composite not only has the highest reaction energy density of 1051.62 J/g, but also has good strength and plasticity. The tensile strength, elongation and bending strength reach 285.05 MPa, 8.87% and 309.09 MPa respectively. When the layer thickness ratio increases from 1/2 to 1/1, both the tensile strength and bending strength increase, the plasticity decreases. This is related to the composition and interfacial structure. Failure mode of Ni/Al multilayered energetic structural composite is delamination mixed with fracture, and the interface delamination gets more serious with the increase of the layer thickness ratio.

Keywords

• original layer thickness ratio
• hot pressing
• ni/al multilayered energetic structural com-posite
• exothermic property
• mechanical property