Effects of thermal processing and rapid solidification on the microstructural evolution in Ni-Co-Al ternary alloys

doi:10.13251/j.issn.0254-6051.2024.07.036

Abstract

Abstract: Due to the typical phase transformation process and good thermal processing performance, Ni-Co-Al ternary alloy has become an important model alloy in the research of phase transformation, structure and function application of Ni-based alloy. Based on the requirements of controlling the size and orientation of microstructure units in the functional applications of Ni-based alloys, the effects of different alloy compositions, thermal processing and rapid solidification processes on the grain size, grain orientation and microhardness of the alloys were investigated. The results show that the grain size of the alloy ingot obtained by arc melting process can be obviously refined after cold rolling-annealing treatment, and the average size is about 30 μm, while the grain size of the alloy strips obtained by rapid solidification process (vacuum melt spinning) can be further reduced to about 10 μm. In addition, the rapid solidification process can significantly change the grain orientation of the alloy, from the {101} orientation in the traditional processing to the preferred {100} orientation, which is conducive to the optimal control of the micro-nano structural unit and effective specific surface area of Ni-based alloys, further improving the structure and functional application potentials of the Ni-based alloys.

Key words: Ni-based alloy, grain size, orientation, hardness, thermal processing, rapid solidification

CLC Number:

TG156.21

Li Bokui, Zhou Fei, Cui Yanna, Li Ming, Zhou Yang, Wang Jun. Effects of thermal processing and rapid solidification on the microstructural evolution in Ni-Co-Al ternary alloys[J]. Heat Treatment of Metals, 2024, 49(7): 231-240.

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