Nano-precipitate and its aging behavior in a B2-NiAl strengthened ferritic ODS alloy
2021
Wang, Shengxi | Zhang, Lin | Liu, Ye | Chen, Yan | Chen, Xiaowei | Gao, Zhenhuan | Qu, Xuanhui
The effect of aging on a mechanical alloyed (MA) ferritic oxide dispersion strengthened (ODS) alloy was investigated focusing on the B2-NiAl nano-precipitates. The matrix of the alloy is decorated with a high volume fraction of B2-NiAl precipitates and dispersed nano-oxide particles. Due to the coarsening effect of Al on oxides and the changed Zener drag effect on grain growth, the bimodal grain structure was formed. With the extension of the aging time, the size of nano-precipitate increases and its morphology changed from near spherical to rodlike. The temporal evolution of nano-precipitates upon aging treatment is consistent with the modified Lifshitz–Slyozov–Wangner (LSW) theory. In addition, the quantitative calculation reveals the weakening effect caused by nano-precipitates coarsening during aging is the main reason for the decrease in alloy strength.
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