Compressive deformation behavior of TiC/AZ91Dcomposites at elevated temperatures
CHEN Liqing; DONG Qun; GUO Jinhua; BI Jing; XU Yongbo
Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016
Cite this article:
CHEN Liqing; DONG Qun; GUO Jinhua; BI Jing; XU Yongbo. Compressive deformation behavior of TiC/AZ91Dcomposites at elevated temperatures. Acta Metall Sin, 2005, 41(3): 326-332 .
Abstract In situ reactive infiltration technique was utilized
to synthesis TiC
particulate-reinforced magnesium matrix composites
(TiC/AZ91D). The hot compressive
behavior of as fabricated composites was
studied at strain rates
$\dot{\varepsilon} =10 -3-10 -1 s-1
and at temperatures of 573-723 K. The strain
rate sensitivity exponent ($m$), apparent activation
energy (Q) and their relations with TiC content and
temperature were calculated and analyzed
according to the true stress-true strain curves.
The results show that the compressive flow stress
of the composites increases with increasing
the TiC content. For the same TiC
content, the flow stress decreases with
elevating deformation temperatures or with decreasing
the initial strain rates. The m value increases with
increasing temperature and at the same
deformation temperature and strain rate,
the m value increases with increasing the TiC content.
The Q value depends on the deformation temperature,
strain rate and TiC content and its
distribution, and the composites exhibit
different deformation mechanisms at elevated
temperatures.
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