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| Deformation Behavior of Alloy Mg–9Li–3Al–2.5Sr at Elevated Temperature |
| LI Junchen1 , PENG Xiaodong1,2 , LIU Junwei1 , YANG Yan1 , ZENG Li1 |
1.College of Material Science and Engineering, Chongqing University, Chongqing 400045
2.National Engineering Research Center for Magnesium Alloys, Chongqing 400044 |
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Cite this article:
LI Junchen PENG Xiaodong LIU Junwei YANG Yan ZENG Li. Deformation Behavior of Alloy Mg–9Li–3Al–2.5Sr at Elevated Temperature. Chin J Mater Res, 2012, 26(3): 309-314.
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Abstract The uniaxial hot compression test with Gleeble–1500D thermal simulator had performed on Mg–9Li–3Al–2.5Sr alloy at 200–350℃ and strain rates of 0.001–1 s−1. The correlation between the flow stress and the temperature and strain rates were analyzed, the constitutive equation of the alloy at elevated temperature was established, and the hot processing map of the alloy was also calculated and investigated by observing the microstructure. The results show that the flow stress becomes higher with increase of strain rates at constant temperature, and lower with increase of deformation temperature at constant strain rate. The steady flow stress of the alloy deformed at elevated temperature can be well described by the hyperbolic sine constitutive equation. The result of hot processing map shows that the optimal hot working parameters for the alloy Mg–9Li–3Al–2.5Sr is at 260–300℃ and strain of 0.01–1 s−1, and the super–plastic deformation domain is at 340–350℃ and strain of 0.003–0.01 s−1.
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Received: 11 April 2012
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| Fund: Supported by National Key Basic Research and Development Program of China No.2007CB613702. |
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