HIGH-RESOLUTION ELECTRON-MICROSCOPY OF MEDIUM-RANGE ORDER IN AMORPHOUS-ALLOYS

被引:16
作者
HIROTSU, Y
机构
[1] Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka, 940-21, Kamitomioka-cho
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1994年 / 179卷
关键词
D O I
10.1016/0921-5093(94)90172-4
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Under suitable defocus conditions, structures with atomic medium-range order (MRO) extending 1-2 nm in space can be observed in amorphous alloys as clear lattice images by means of high-resolution electron microscopy (HREM). Using the Pd-Si system, it was demonstrated that the MRO structure and morphology depend on the cooling rate and alloying composition. In Pd-Si alloys, the volume fraction and size of the MRO domains were found to increase as the cooling rate decreased. MRO with f.c.c.-like structure appears in a eutectic composition range, between approximately Pd84Si16 and Pd80Si20. We also performed detailed HREM observations and nano-beam analysis of the local structural change on annealing in Pd82Si18 alloy. It is concluded that the atomic free volume is annihilated by the atomic rearrangement for the formation and development of MRO domains.
引用
收藏
页码:97 / 101
页数:5
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