Relaxation path of nanoparticles in an oxygen-enriched ferritic oxide-dispersion-strengthened alloy
Relaxation path of nanoparticles in an oxygen-enriched ferritic oxide-dispersion-strengthened alloy
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DOI：
10.1016/j.scriptamat.2017.04.014
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发表时间：
2017-07
影响因子：
6
通讯作者：
M. Thual;J. Ribis;T. Baudin;V. Klosek;Y. Carlan;M. Mathon
中科院分区：
文献类型：
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作者：
M. Thual;J. Ribis;T. Baudin;V. Klosek;Y. Carlan;M. Mathon
氧化物弥散强化（ODS）合金的优异力学性能源于高密度的Y-Ti纳米氧化物在基体中的精细分散。这种沉淀的特性可以强烈地受到研磨过程中的氧污染的影响。采用高分辨透射电子显微镜研究了原始态和退火态（1h 1150 °C）富氧铁素体ODS合金。收到的样品具有未知的b.c. c纳米氧化物，而退火的样品具有正交纳米颗粒。我们提出了一个相弛豫退火过程中，证实了一个粒子的观察，立方和正交结构共存。讨论了氧对颗粒结构的影响。
Excellent mechanical properties of oxide-dispersion-strengthened (ODS) alloys arise from a high density of Y-Ti nano-oxides finely dispersed in the matrix. Characteristics of this precipitation can strongly be influenced by oxygen contamination during milling. We studied an as-received and annealed (1 h 1150 °C) oxygen-enriched ferritic ODS alloy by High Resolution Transmission Electron Microscopy. The as-received sample has unknown b.c.c nano-oxides, while the annealed one has orthorhombic nanoparticles. We propose a phase relaxation during the annealing, confirmed by the observation of a particle where both cubic and orthorhombic structures coexist. The influence of oxygen on the particle structure is also discussed.