高铬钢碳化物晶内缺陷的STM及FFT分析  

STM and FFT studies of intra-grain defect of carbide in a high Cr steel

作　　者：王家军[1] 杨志刚[1] 李春明[1] 郑燕康[1] 方鸿生[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《清华大学学报（自然科学版）》1996年第6期15-19,共5页Journal of Tsinghua University(Science and Technology)

摘　　要：用扫描隧道显微镜（ＳＴＭ）观察了Ｃｒ１２合金中（ＣｒＦｅ）７Ｃ３碳化物的精细结构，证实其晶粒内部存在层错亚结构；并发现同一晶粒内存在几个沿不同位向排列的平行层错群，不同平行群间呈约９０°夹角。ＳＴＭ图象的快速Ｆｏｕｒｉｅｒ变换（ＦＦＴ）及逆变换（ＩＦＦＴ）结果表明，层错排列具有一定周期性。实验测得层错面间距为 ５０ ｎｍ。The intra-grain fine structure of (CrFe)7C3 carbide in an Fe-Cr-C alloy has been studied by scanning tunneling microscopy (STM ). It proves that a carbide grain is substructurally stacking faulted. It was also discovered that there are several parallel sheaves of stacking faults located in one carbide grain which lie at angle of about 90° with each other. Fast Fourier transformation (FFT) and inverse fast Fourier transformation (IFFT) further show the periodicity of stacking faults. The interspacing between two adjacent sheaves of stacking faults is determined to be about 50 nm.

关 键 词：碳化物 扫描隧道显微镜 FFT 高铬钢 缺陷 

分 类 号：TG142.33[一般工业技术—材料科学与工程]