Optimization of mechanical properties of cast NiAl-28Cr-5.5Mo-0.5Hf alloy

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. A02; pp. 191 - 196
• Main Author: 郭建亭 高强 淮凯文 李谷松 李虎田
• Format: Journal Article
• Language: English
• Published: Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China 01.09.2006; Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China%Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
• Subjects: 力学性质; 显微结构精化; 铸造NiAl-28Cr-5.5Mo-0.5Hf合金; microstructure refinement; processing; precipitation strengthening; NiAl-28Cr-5.5Mo-0.5Hf; high solidification rate
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(06)60034-4

The effects of different processing techniques on the microstructure and compressive properties of NiAl-28Cr-5.5Mo-0.5Hf alloys were evaluated. These processing routes can all improve the compressive properties of NiAl-28Cr-5.5Mo-0.5Hf alloys. The microstructural refinement and the stronger precipitation strengthening mechanisms are responsible to the improvement of the compressive properties under the condition of higher undercooling degree. In addition, high magnetic field treatment and trace rare earth elements addition can significantly optimize the mechanical properties of NiAl-28Cr-5.5Mo-0.5Hf alloy. The improvement of NiAl-28Cr-5.5Mo-0.5Hf alloy seems to be realized by a complicated combination of different processing route. A directional solidification at a high drawing rate under high magnetic field for NiAl-28Cr-5.5Mo-0.5Hf alloy containing minor rare earth element is a desirable route to the high performance NiAl-28Cr-5.5Mo-0.5Hf alloy.