^MICROSTRUCTURE OF NANOCRYSTALLINE MATERIALS

Acta Metall Sin

1995, Vol. 31

Issue (2): 79-84 DOI:

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^MICROSTRUCTURE OF NANOCRYSTALLINE MATERIALS

PING Dehai; LI Douxing; YE Hengqiang(Laboratory of Atomic Imaging of Solids;Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015). WU Xijun(Zhejiang University; Hangzhou 310014) (Manuscript received 94-06-30)

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Abstract The grain boundaries in nanocrystalline palladium synthesized by the inert gas condensation and in situ compacting method have ordered and imperfect or disordered regions. Nanovoids are also observed at the interfaces. High density of dislocations are detected inside the grains and at the grain boundaries. Most of the interfaces in nanocrystalline Ti-Ni-Si and Fe-Mo-Si-B alloys produced by the amorphous crystallization have ordered structure. No obvious disordered regions and nanovoids are observed at the interfaces. However, the lattice fringes near the ordered grain boundaries or interfaces regions in the nanocrystalline materials produced by the various process show curved and a little distorted appearance. In comparison with the nanocrystalline palladium, the nanocrystalline alloys obtained from the amorphous crystallization have much lower density of dislocations.Correspondent:PING Dehai,(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015)

Key words: nanocrystalline materials grain boundary defect high resolution electron microscopy

Received: 18 February 1995

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