Effect of Cold Deformation Followed Aging on the Microstructure and Mechanical Properties of Ni36CrTiAl Alloy

The microstructure and properties of Ni36CrTiAl alloy after aging at 650,670,700 and 720 ℃ after cold rolling and aging at 650 ℃ after solid solution at 950 ℃ were studied.The size of cell-shaped γ′ phase increased with increasing the aging temperature after cold rolling,the diameter of cell-shaped γ′ at 650 ℃ aging was about 30-60 nm and that at 720 ℃ was about 60-140 nm.The amount of cell-shaped γ′ after cold rolling followed aging was more than that after solid solution followed aging and the size of the former was also bigger than the latter.The strength and plasticity of Ni36CrTiAl alloy after cold rolling followed aging decreased with increasing the aging temperature.The tensile strength and yield strength of solid solution followed aging was 26.2% and 45.3% less than that of cold rolling followed aging respectively,but the elongation of the former increased 1.2 times of the latter.