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.
机构:
Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, IsraelTechnion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, Israel
Amram, Dor
Kovalenko, Oleg
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机构:
Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, IsraelTechnion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, Israel
Kovalenko, Oleg
Rabkin, Eugen
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机构:
Technion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, IsraelTechnion Israel Inst Technol, Dept Mat Sci & Engn, IL-3200003 Haifa, Israel