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High-temperature tensile properties of in situ-synthesized titanium matrix composites with strong dependence on strain rates

Published online by Cambridge University Press:  31 January 2011

Lv Xiao ,
Weijie Lu ,
Jining Qin ,
Di Zhang ,
Minmin Wang ,
Feng Zhu  and
Bo Ji
Lv Xiao
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Weijie Lu*
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Jining Qin
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Di Zhang
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Minmin Wang
Affiliation:
Department of Titanium Alloy, Special Steel Branch, Baoshan Iron and Steel Co. Ltd., Shanghai 200940, People’s Republic of China
Feng Zhu
Affiliation:
Department of Titanium Alloy, Special Steel Branch, Baoshan Iron and Steel Co. Ltd., Shanghai 200940, People’s Republic of China
Bo Ji
Affiliation:
Department of Titanium Alloy, Special Steel Branch, Baoshan Iron and Steel Co. Ltd., Shanghai 200940, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: luweijie@sjtu.edu.cn
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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.

Keywords

CompositeMorphologyStrength
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 11 , November 2008 , pp. 3066 - 3074
Copyright
Copyright © Materials Research Society 2008

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References

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