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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 1    March 1999

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IN-SITU OBSERVATION OF CRACK PROPAGATION IN PST CRYSTALS OF Ti-49%Al ALLOY①
Lu Yonghao, Zhang Yonggang and Chen Changqi

Department of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics, Beijing100083, P. R. China

Abstract:The effects of loading axis to the lamellae on the fracture behavior of PST crystals have been investigated by SEM in-situ testing. The results show that the fracture behavior of PST crystals ofγ-TiAl base alloys depend on not only the angles between cracks and lamellae, but also the angles of loading axis to the lamellae, and the cracks propagating along different paths show different toughening mechanisms, crack resistance, corresponding fracture behavior and fractography.

 

Key words: PST crystal fracture behavior crack path toughness mechanism

ISSN 1672-7029
CN 43-1423/U

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