Abstract
High-temperature titanium matrix composites reinforced with hybrid reinforcements are synthesized by common casting and hot working technologies. Tensile properties are tested at different temperatures and strain rates. Ultimate strengths of the composites are significantly enhanced under all conditions and decrease when the strain rate is lower. Equicohesive temperature of the matrix is around 873 K at the strain rate 10−3s−1 and well below 873 K at 10−5s−1. At higher temperature or lower strain rate, interfacial debonding is more drastic and reduces the strengths of composites. The materials are embrittled under creep-rupture conditions. Strict reinforcement morphology is required for more complex service conditions at high temperatures in metal matrix composites.
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Acknowledgments
We acknowledge the financial support provided by High Technology Research and Development Program of China under Grant No. 2006AA03Z559, 973 Program under Grant No. 2007CB613806, Program for New Century Excellent Talents in University under Grant No. NCET-07-0549, A Foundation for the Author of National Excellent Doctoral Dissertation of P.R. China under Grant No. 200332, National Nature Science Foundation of China under Grant No. 10577013, and Major Fundamental Research Project of Shanghai Science and Technology Committee under Grant Nos. 06DZ22004, 06JC14038, and 07QB14001.
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Xiao, L., Lu, W., Qin, J. et al. High-temperature tensile properties of in situ-synthesized titanium matrix composites with strong dependence on strain rates. Journal of Materials Research 23, 3066–3074 (2008). https://doi.org/10.1557/JMR.2008.0378
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DOI: https://doi.org/10.1557/JMR.2008.0378