Effect of Heat Removal on Pore Growth in Nickel-Aluminide during SHS: A Small-Angle Neutron Scattering Investigation

Abstract

Effects of heat removal on the pore growth during self-propagating high temperature synthesis (SHS) of Nickel-Aluminide have been investigated using small angle neutron scattering (SANS) technique. It has been revealed that the rate of heat removal vis-à-vis the velocity of the propagating wave front during synthesis controls the growth of the pore size in the final product to some extent. Significant growth in pore size occurs mainly due to thermal migration and molar volume contraction. The structure factors of the specimens can be scaled with respect to the average size and the effective radius of gyration of the pores.

Keywords:

• SHS
• SANS
• Pore growth
• Size distribution