Nano-precipitate and its aging behavior in a B2-NiAl strengthened ferritic ODS alloy
Nano-precipitate and its aging behavior in a B2-NiAl strengthened ferritic ODS alloy
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DOI：
10.1007/s10853-021-06538-1
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发表时间：
2021-09
影响因子：
4.5
通讯作者：
Shengxi Wang;Lin Zhang;Ye Liu;Yan Chen;Xiaowei Chen;Zhen-Ning Gao;X. Qu
中科院分区：
文献类型：
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作者：
Shengxi Wang;Lin Zhang;Ye Liu;Yan Chen;Xiaowei Chen;Zhen-Ning Gao;X. Qu
研究了时效对机械合金化（MA）铁素体氧化物弥散强化（ODS）合金中B2-NiAl纳米析出相的影响。合金基体上分布着大量的B2-NiAl析出相和弥散分布的纳米氧化物颗粒。由于Al对氧化物的粗化作用和晶粒生长过程中Zener拖曳效应的改变，形成了双峰晶粒结构。随着时效时间的延长，纳米析出相的尺寸逐渐增大，形貌由近球形向棒状转变。时效处理后的纳米析出物的时间演变与修改后的Lifshitz-Slyozov-Wangner（LSW）理论一致。此外，定量计算还揭示了时效过程中纳米析出相粗化所产生的弱化作用是导致合金强度下降的主要原因。
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.