论文部分内容阅读
In the present work, the NiCoCrAl alloy sheet was fabricated by electron beam physical vapor deposition technique and the effect of the heat treatment on the microstructure and tensile strength of the NiCoCrAl alloy sheet was investigated in detail.The heat treatment at 1050 ℃ was favorable to improve the interface bonding between the columnar structures due to the disappearance of the intergranular gaps.Comparing with the thin NiCoCrAl alloy sheet before the heat treatment, the Ni3Al phase appeared in the NiCoCrAl alloy sheet after the heat treatment, which was favorable to improve the interface bonding between the columnar structures because the fracture mode was changed from the inter-columnar fracture to the trans-granular fracture.The increase in the tensile strength and elongation percentage was attributed to the improvement in the interface bonding between the columnar structures.The residual stress in the NiCoCrAl alloy sheet after the heat treatment was reduced significantly, which also confirmed that the interface bonding was improved by the heat treatment.