Fracture Behaviour of TiAl Intermetalics
作者： Ivo Dlouhý , Zdenĕk Chlup , Hynek Hadraba , Vladislav Kozák
DOI: 10.1007/978-90-481-2669-9_28
关键词:
摘要: The role of microstructural parameters in fracture behaviour TiAl intermetalics at room and increased temperatures will be focus interest. Based on experimental findings sampled this field arising from literature knowledge an overview typical micromechanisms acting different microstructures presented. Where possible semi-quantitative evaluation toughening effects Tensile properties, flexural strength toughness have been evaluated mainly for Ti-40Al-2Cr-2Nb-1B Ti-46Al-0.7Cr-0.1Si-7Nb-0.2Ni alloys. For determination chevron-notch specimen technique applied except standard pre-cracked samples. Positive effect Nb resistance has found; the high alloy contemporary increase strength. Fracture surfaces using scanning electron microscopy showing key mechanical twinning deformation both alloys followed. As a governing mechanism crack nucleation microcrack formation boundaries between twins γ grains confirmed.
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