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Thermomechanical processing of (TiB + TiC)/Ti matrix composites and effects on microstructure and tensile properties

Published online by Cambridge University Press:  15 April 2016

Changjiang Zhang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China; and Department of Materials Processing Engineering, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China
Shuzhi Zhang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China; and Department of Materials Processing Engineering, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China
Peng Lin
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China; and Department of Materials Processing Engineering, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China
Zhaoping Hou
Affiliation:
Department of Materials Science, School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China
Fantao Kong
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, Heilongjiang, People's Republic of China
Yuyong Chen
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, Heilongjiang, People's Republic of China
Corresponding
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Abstract

In the paper, 2.5 vol% (TiB + TiC)/Ti composite has been fabricated by in situ casting route. 1-D forging and subsequent multistep rolling in (α + β) phase field are conducted on the as-cast composite and, accordingly, the matrix microstructure is significantly refined, and the distribution uniformity of reinforcements is greatly improved. The tensile properties of the composites with different processing states are tested at room temperature (RT), 600 and 700 °C. The results indicate that thermomechanical processing (TMP) can drastically improve strength and elongation of the as-cast composite both at RT and 600 °C. As tensile temperature increases to 700 °C, the UTSs of the composites gradually reduce while the elongations of the composites are enhanced remarkably after TMP. The degradation in UTS can be related to the matrix softening and interfacial debonding at 700 °C.

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Copyright
Copyright © Materials Research Society 2016 

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