Nanoscale characterization and formation mechanism of nanoclusters in an ODS steel elaborated by reactive-inspired ball-milling and annealing
Nanoscale characterization and formation mechanism of nanoclusters in an ODS steel elaborated by reactive-inspired ball-milling and annealing
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DOI：
10.1016/j.jnucmat.2010.09.011
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发表时间：
2011-02-15
影响因子：
3.1
通讯作者：
Legendre, F.
中科院分区：
文献类型：
--
作者：
Brocq, M.;Radiguet, B.;Legendre, F.
提出了反应激发球磨作为氧化分散强化（ODS）钢的新生产路线。因此，采用FeCrWTi和YFe3 + Fe2O3粉末代替Y2O3，球磨制备fe - 14cr - 2w - 1ti -0.8 y -0.2 2o (wt.%) ODS钢，然后在800℃下退火5 min。在铣削和退火后，通过电子探针微分析和原子探针层析成像（APT）进行表征。用APT球磨后首次观察到纳米团簇，这些纳米团簇富集钛、钇和氧，其平均半径为0.8 nm。退火后，平均半径增大到1.4 nm， o、Ti和Y的富集系数增大，数量密度增大。因此，在这些合成条件下，观察到一种新的纳米团簇形成机制：球磨引发纳米团簇成核，退火过程中，纳米团簇继续成核，并伴有纳米团簇的轻微生长。因此，反应激发球磨似乎是一种有前途的路线，以合成ODS钢的细和密集的氧化物分散。(C) 2010 Elsevier B.V.版权所有
Reactive-inspired ball-milling is proposed as a new production route for oxide dispersion strengthened (ODS) steels. So a Fe-14Cr-2W-1Ti-0.8Y-0.2O (wt.%) ODS steel is elaborated by ball-milling of FeCrWTi and YFe3 plus Fe2O3 powders instead of Y2O3 and then by annealing at 800 degrees C for 5 min. Characterizations by Electron Probe MicroAnalysis and Atom Probe Tomography (APT) are performed after milling and after annealing. For the very first time, nanoclusters are observed after ball-milling by APT. Those nanoclusters are enriched in titanium, yttrium and oxygen and their mean radius is 0.8 nm. With annealing, the mean radius rises up to 1.4 nm and the number density as well as the enrichment factor in O. Ti and Y increase. So a new formation mechanism of nanoclusters is observed in those conditions of synthesis: ball-milling initiates the nanoclusters nucleation and during annealing, nucleation continues, accompanied by a slight growth of nanoclusters. Thus reactive-inspired ball-milling appears as a promising route for synthesizing ODS steels with a fine and dense dispersion of oxides. (C) 2010 Elsevier B.V. All rights reserved.