Effect of heat treatment on microstructure and tensile strength of NiCoCrAl alloy sheet fabricated by EB-PVD
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.
EB-PVD microstructure heat treatment alloy sheet
Shi Guodong Wang Zhi Wang Yishou Wu Zhanjun Jun Liang
School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Labo School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Labo Center for Composite Materials, Harbin Institute of Technology, Harbin, 150001, China
国际会议
上海
英文
17-17
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）