摘要
合金高温氧化时在氧化膜/合金界面处常出现孔洞,显著地削弱氧化膜的黏附力.研究了1000℃氧化后Fe—40％Al合金/氧化膜处孔洞的生成过程,并测定孔洞数量与体积随氧化时间的变化.将经不同时间氧化试样表面形成的氧化膜揭去后,用扫描电子显微镜和原子力显微镜测定界面处孔洞的大小和深度.同时基于氧化过程中产生的空位全部聚集形成孔洞的考虑,计算了形成孔洞的总量.把实验结果与理论计算进行比较,讨论了氧化膜/合金界面处孔洞形成的机制.
Engineering alloys of heat resistance often generate pores at the scale/alloy interface during high temperature oxidation. The accumulation and growth of those pores greatly weaken scale adhesion. The purpose of this study is to observe pore development in Fe-40%Al (atomic fraction) and measure the change in pore volume with oxidation time. Experimental results are then compared to a theoretical calculation where all vacancies are allowed to condense as voids. After removing the oxide scales formed after various times of oxidation at 1000 癈 in oxygen, the alloy surface was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM) to determine the size and depth of interfacial pores. Results are discussed in light of possible mechanisms involved in pore formation at scale/alloy interfaces.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第10期1065-1070,共6页
Acta Metallurgica Sinica
基金
美国能源部项目DE-AC03-76SF00098
国家自然科学基金项目59725101资助
