A Ni3Al-based superalloy of Ni-Al-Mo system was successfully prepared by using the multifunctional spray atomization and deposition plant. Testing for tensile properties indicated that the spray deposited Ni3Al-Mo alloy possesses `R' characteristic in the yield strength. Analysis of dislocation structure by transmission electron microscopy revealed the relationship between the microstructure and yield strength. The results showed that the yield strength changing with temperature for the alloy was determined by the dislocation winding condition, pattern and quantity of the dislocation pair and starting degree of the hexahedron slide system inside γ′ and γ phases.

Dislocation Structure of Spray Deposited Ni3Al-Mo Alloy. Mi, G., Luo, Z., Tian, S., Li, Q.: Journal of Aeronautical Materials, 1999, 19[3], 19-26