Preferential Au precipitation at deformation-induced defects in Fe-Au and Fe-Au-B-N alloys

被引：16
|
作者：
Zhang, S. [1 ]
Langelaan, G. [1 ]
Brouwer, J. C. [2 ]
Sloof, W. G. [2 ]
Bruck, E. [1 ]
van der Zwaag, S. [3 ]
van Dijk, N. H. [1 ]
机构：
[1] Delft Univ Technol, Fac Sci Appl, NL-2629 JB Delft, Netherlands
[2] Delft Univ Technol, Dept Mat Sci & Engn, NL-2628 CD Delft, Netherlands
[3] Delft Univ Technol, Fac Aerosp Engn, Novel Aerosp Mat Grp, NL-2629 HS Delft, Netherlands
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 584卷
关键词：
Self-healing; Metals and alloys; Plastic deformation; Au precipitation; Surface segregation; CREEP CAVITATION RESISTANCE; THIN-FILMS; BORON; SEGREGATION; SURFACE;
D O I：
10.1016/j.jallcom.2013.09.011
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 influence of deformation-induced defects on the isothermal precipitation of Au was studied in high-purity Fe-Au and Fe-Au-B-N alloys. Preferential Au precipitation upon annealing at 550 degrees C is observed at local plastic indentations. In fractured Fe-Au-B-N, solute Au atoms were found to heterogeneously precipitate at grain boundaries and local micro-cracks. This is supported by in-situ creep tests that showed a strong tendency for Au precipitation at cracks and cavities also formed during creep loading at 550 degrees C. Complementary X-ray photoelectron spectroscopy experiments indicate a strong tendency of Au, B and N segregation onto free surface during aging. The observed site-specific precipitation of Au holds interesting opportunities for defect healing in steels subjected to creep deformation. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：425 / 429
页数：5
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