Isothermal Corrosion Behaviors of TiAl-Nb Alloys in Liquid Zn-55Al-1.6Si (wt.%)
The isothermal static corrosion of Ti-45Al-8Nb and Ti-53Al-20Nb (at.%) in liquid Zn-55Al-1.6Si (wt.%) at 630°C was studied.Incubation periods without any corrosion occurred are exhibited in both alloys.After the incubation time,the corrosion rate increases noticeably which is controlled by the reaction-diffusion and dissolution mechanism.Thick transition layers were formed.The EDS results show that Si and Al diffused into the TiAl-Nb alloys preferentially,while Zn was hindered from diffusing and segregated in spots.All the transition layers are porous and composed mainly of Al3Ti (Nb),SiTi and AlNbZn2.The fracture of the transition layers of Ti-45Al-8Nb should be attributed to the defects of the lamellar colony boundaries.Nano Indenter was used to check the mechanical properties of the materials.The results show that the transition layers have higher micro-hardness and elastic modulus than the matrix.
TiAl-Nb intermetallic compound Galvalume Corrosion Diffusion.
Pengfei Sun Xiaoou Jin Yifan Hu Junpin Lin
State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing, School of Architecture and Engineering, Heilongjiang University, Harbin 150080, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
69-76
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）