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| Investigations of Discontinuous Precipitation and Effects of Strengthening–Toughening Studies on Ni–Co–Al Alloys |
| ZHOU Yang 1,2, WANG Chentuo 1,2, ZHOU Fei 1,2, LIANG Jiamiao 1,2, WANG Jun 1,2 |
| (1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, Shanghai 200240, China) |
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Abstract The occurrence of discontinuous precipitation (DP) in multi-component alloys is usually considered to be deleterious to the mechanical properties. However recent studies have shown that lamellar nanostructure can be produced in Ni–Co–Al alloys via DP, which can be used to strengthen alloys similar to pearlites in steel. In order to further investigate the effect of discontinuous precipitation on the mechanical properties of Ni–Co–Al alloy, this article summarizes and discusses the changes in the microstructure and mechanical properties of the alloy under different alloy compositions and heat treatment conditions. The results show that the increase of Co content and lower aging temperature are favorable for the occurrence of discontinuous precipitation, and near-complete DP structure can effectively improve the strength and plasticity of Ni–Co–Al alloys. Through theoretical modeling, microstructure characterization and mechanical property analysis, the precipitation behavior of discontinuous precipitation and the mechanism of the reaction to strengthen and toughen Ni–Co–Al alloy are also discussed. This treatment method provides new ideas for researches on the strengthening and toughening of Ni–based superalloys.
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2021, 
