Microscopic phase-field study of atomic anti-site behaviors in precipitation progress of Ni3(AlFe)
The effects of temperature on atomic anti-site behaviors were studied using microscopic phase-field dynamic model in precipitation progress of Ni75Al20Fe5 alloy. The results shows that with the increase of temperature, the formation of NiAl and AlNi anti-sites is much easier in Ni3(AlFe), and Ni and Al anti-site atoms shows clearly stronger temperature-dependent than Fe anti-site atoms. The evolution progress of anti-site atoms already was completed at the initial stage of L12 phases growing. The site occupation probabilities of Ni atoms on the A sublattice (face centers sites of f.c.c.), and Al and Fe atoms on the B sublattice(corners sites of f.c.c.) all present the degressive tendency with the temperature increasing. Fe atoms mainly prefer to occupy the Al sublattice at the whole temperature range. Furthermore, the ordering progress of the formation of L12 phases is virtually the evolution progress of atoms respective occupying the corresponding sublattice and reaching the equilibrium value.
Anti-site Precipitation Ni3(AlFe) Microscopic phase-field
梁敏洁 陈铮 王永欣 张济祥
西北工业大学材料科学与工程学院,陕西西安 710072
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）