Erbium and ytterbium solubilities and diffusivities in aluminum as determined by nanoscale characterization of precipitates
Erbium and ytterbium solubilities and diffusivities in aluminum as determined by nanoscale characterization of precipitates
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DOI：
10.1016/j.actamat.2009.05.007
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发表时间：
2009-08-01
期刊：
影响因子：
9.4
通讯作者：
Seidman, David N.
中科院分区：
文献类型：
--
作者：
van Dalen, Marsha E.;Karnesky, Richard A.;Seidman, David N.
0.03- 0.06at.%的二元铝合金RE（RE = Yb或Er）被老化以在α-Al基质中产生连贯的纳米尺寸的Al 3RE沉淀。通过透射电子显微镜和局部电极原子探针断层扫描，分别测量在300摄氏度的沉淀半径和基质浓度的时间演变。的时间依赖性的基质浓度的每一个RE被用来确定其在Al中的溶解度。溶解度和粗化速率常数被用来确定在α-Al和α-Al/Al 3RE在300 ℃的界面自由能的每一个RE的扩散。当与Sc相比，Yb和Er都表现出较小的溶解度，但在α-Al和更大的α-Al/Al 3RE界面能较大的扩散系数。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Binary aluminum alloys with 0.03-0.06 at.% RE (RE = Yb or Er) were aged to produce coherent, nanosize Al3RE precipitates in an alpha-Al matrix. The temporal evolution of precipitate radii and matrix concentrations at 300 degrees C were measured by transmission electron microscopy and local-electrode atom-probe tomography, respectively. The temporal dependence of the matrix concentration of each RE was utilized to determine its solubility in Al. The solubility and the coarsening rate constants were used to determine the diffusivity of each RE in alpha-Al and the alpha-Al/Al3RE interfacial free energies at 300 degrees C. When compared to Sc, both Yb and Er exhibited smaller solubilities but larger diffusivities in alpha-Al and larger alpha-Al/Al3RE interfacial energies. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.