Coarsening of γ′ Precipitates in a Nickel-Based Superalloy Prepared by EBPVD

HAN Jie-cai;LI Xiao-hai;CHEN Gui-qing;MENG Song-he

Journal of Aeronautical Materials ›› 2006, Vol. 26 ›› Issue (6) : 38-41.

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Journal of Aeronautical Materials ›› 2006, Vol. 26 ›› Issue (6) : 38-41.

Coarsening of γ′ Precipitates in a Nickel-Based Superalloy Prepared by EBPVD

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Abstract

The sheet metal of a new Nibased superalloy was prepared by Electron Beam Physical Vapor Deposition(EBPVD) technology.Microhardness tester and transmission electron microscope were used to study the change of room temperature microhardness,coarsening behavior and morphological change of γ′ precipitates.Results show that γ′ precipitates coarsened by the step growth mechanism change from approximately round shape to regular order cubic one with the increase of aging temperature.Growth of γ′ precipitates proceeds by Ostwald ripening controlled by volume diffusion of solute atoms.The activation energy for growth are evaluated as 266.18kJ·mol-1 for this alloy.The decrease in room temperature microhardness and the softening of alloy can be attributed to the growth of γ′ precipitates in the alloy.

Key words

electron beam physic / nickel-based superal / gamma prime precipit / coarsening / Ostwald ripening

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HAN Jie-cai, LI Xiao-hai, CHEN Gui-qing, MENG Song-he. Coarsening of γ′ Precipitates in a Nickel-Based Superalloy Prepared by EBPVD[J]. Journal of Aeronautical Materials, 2006, 26(6): 38-41

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