|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||High Temperature and High Strain Rate Deformation Behavior of Powder Metallurgical TiAl-Nb Composite
||Yong Liu, Bin Liu, Qihong Fang, Xiang Zan
|On-Site Speaker (Planned)
Powder metallurgy becomes more and more important in processing TiAl intermetallics, esp. for TiAl-based composites. In this presentation, TiAl composites with the addition of ductile Nb particles were produced by hot isostatic pressing and subsequent hot extrusion. The microstructures consist of lamellar-structured or duplex matrix and elongated Nb-rich fibers. Since TiAl intermtallics are used for high temperature applications, the high strain rate (~1300 s-1) and high temperature (~800 C) deformation behavior was evaluated on both the matrix and composites. The results indicated that TiAl generally show a higher strength under dynamic condition than under static condition, and the deformation mechanism is mainly controlled by twinning and shear banding. Finally, constitutive equations based on Zerrilli-Armstrong model were built up, and the deformation and the effect of Nb-rich fiber were discussed. In general, powder metallurgical TiAl-Nb composites show promising properties in the high temperature and high impact applications.
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