Thermal stability of (CoCrFeNi)94Ti2Al4 alloy containing coherent nanoprecipitates at intermediate temperatures

Y. Zheng, N. Jia, F. Qian, J. Wang, Y. Xue, K. Jin*

*此作品的通讯作者

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摘要

The thermal stability of (CoCrFeNi)94Ti2Al4 alloys containing coherent nanoprecipitates is investigated at intermediate temperatures of 723–923 K. The microstructure evolution is characterized both inside grains and near grain boundaries upon aging for 12–168 h. The primary L12 precipitates within grains maintain good stability, but unlike the cases at temperatures above 1000 K, the coarsening rate in this temperature regime is not significantly lower than the conventional Ni-based alloys. High density of fine-scaled secondary L12 precipitates are formed outside a narrow precipitate-free zone surrounding the primary precipitates during aging at 923 K, and the A sublattice in such A3B-type precipitates are occupied by higher fraction of Ni in the secondary precipitates than in the primary ones. Furthermore, Heusler phases and discontinuous-precipitate area are observed near grain boundaries, between which and grain interior shows a linearly-arranged precipitate row. Despite such complex microstructure, overall good thermal stability is identified at grain boundaries in this intermediate-temperature regime.

源语言英语
文章编号100775
期刊Materialia
12
DOI
出版状态已出版 - 8月 2020

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Zheng, Y., Jia, N., Qian, F., Wang, J., Xue, Y., & Jin, K. (2020). Thermal stability of (CoCrFeNi)94Ti2Al4 alloy containing coherent nanoprecipitates at intermediate temperatures. Materialia, 12, 文章 100775. https://doi.org/10.1016/j.mtla.2020.100775