Tungsten solubility in L12-ordered Al3Er and Al3Zr nanoprecipitates formed by aging in an aluminum matrix

被引：17
作者：
Farkoosh, Amir R. [1 ]
Dunand, David C. [1 ]
Seidman, David N. [1 ,2 ]
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Northwestern Univ, NUCAPT, Evanston, IL 60208 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 820卷
关键词：
Aluminum alloys; Zirconium; Scandium; Tungsten; Atom-probe tomography; ATOM-PROBE TOMOGRAPHY; 400; DEGREES-C; ZR-TI ALLOYS; AL-ZR; PRECIPITATION EVOLUTION; COARSENING RESISTANCE; AB-INITIO; MECHANICAL-PROPERTIES; CREEP RESISTANCE; SI ALLOY;
D O I：
10.1016/j.jallcom.2019.153383
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The partitioning behavior of tungsten is studied in two dilute Al-Er-W and Al-Zr-W alloys aged isochronally up to 400 and 475 degrees C, to form L1(2)-structured Al3Er and Al3Zr nanoprecipitates. Atom-probe tomography reveals low W solubility in the Al3Er and Al3Zr nanoprecipitates (0.071 and 0.234 at.%, respectively) and very low W solubility in the Al matrix (0.057 and 0.023 at.%, respectively), corresponding to precipitate/matrix partitioning ratios of similar to 1-10. First-principles calculations demonstrate that the formation energies of substitutional W atoms in the L1(2) lattices are high and positive (0.66 - 1.73 eV.atom(-1)), consistent with the small W solubilities measured experimentally in these nanoprecipitates. (C) 2019 Elsevier B.V. All rights reserved.
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页数：6
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