Preferential Au precipitation at deformation-induced defects in Fe-Au and Fe-Au-B-N alloys
Preferential Au precipitation at deformation-induced defects in Fe-Au and Fe-Au-B-N alloys
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DOI：
10.1016/j.jallcom.2013.09.011
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发表时间：
2014-01
影响因子：
6.2
通讯作者：
S. Zhang;G. Langelaan;J. C. Brouwer;W. Sloof;E. Brück;S. Zwaag;N. Dijk
中科院分区：
文献类型：
--
作者：
S. Zhang;G. Langelaan;J. C. Brouwer;W. Sloof;E. Brück;S. Zwaag;N. Dijk
在高纯Fe-Au和Fe-Au - b - n合金中研究了变形缺陷对Au等温析出的影响。在550℃退火时，在局部塑性压痕处观察到优先金析出。在断裂的Fe-Au-B-N中，溶质Au原子在晶界和局部微裂纹处非均匀析出。原位蠕变试验表明，在550°C的蠕变加载过程中，裂纹和孔洞也形成了金析出的强烈趋势。互补x射线光电子能谱实验表明，在时效过程中，Au、B和N有向自由表面偏析的强烈趋势。观察到的特定位置的金的沉淀为受蠕变变形的钢的缺陷愈合提供了有趣的机会。
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 °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 °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.