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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Role of misfit in precipitation crystallography in non-ferrous metals
GU Xin-fu(顾新福), ZHANG Wen-zheng (张文征), ZHANG Min(张  敏), YE Fei(叶  飞)

Laboratory of Advanced Materials, Department of Materials Science and Engineering,
Tsinghua University, Beijing 100084, China

Abstract:The crystallography and morphology of precipitates in different systems were rationalized based on the optimum matching conditions. The interfaces that obey these conditions were conveniently identified in reciprocal space, in terms of three Dg’s parallelism rules. The theoretic basis of the O-lattice and CSL/DSC theory for these rules was provided briefly. Examples of small lattice misfit system (a Ti alloy), and large lattice misfit systems (Al and Mg alloys) were presented. The effect of lattice parameters on the orientation relationship and morphology was also discussed.

 

Key words: precipitation crystallography; interfacial orientation;  Dg parallelism rules; misfit strain

ISSN 1672-7029
CN 43-1423/U

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