| Low-temperature superplasticity of ZK40 magnesium alloy processed using equal channel angular pressing |
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| 作者姓名： | ~*Li LIN~ Lijia CHEN~ Wei WU~ Zheng LIU~ Teng LIU~ |
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| 作者单位： | ~*Li LIN~1，Lijia CHEN~1，Wei WU~1，Zheng LIU~1，Teng LIU~(2，3)，Shiding WU~(2，3) (1. School of Materials Science and Engineering，Shenyang University of Technology，Shenyang 110023，Liaoning，P. R. China; 2. Institute of Metal Research of China Academy of Sciences，Shenyang 110000，Liaoning，P. R. China; 3. Shenyang National Laboratory for Material Science，Shenyang 110015，Liaoning，P. R. China) |
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| 摘 要： | Microstructure evolution and superplastic behaviors of ZK40 magnesium alloy were investigated in the temperature range of 473～623 K. Transmission electron microscopy (TEM) was used to study the microstructure changes, twinning occurred significantly after being processed by equal channel angular pressing (ECAP) for one pass through the die, the mean grain size was 5.6μm. Finer grains can be obtained after further processing through ECAP, the average grain size of the alloy processed by ECAP for three passes was as low as 0.8 μ_m; this alloy exhibited low temperature superplasticity at 473～523 K, elongations obtained at the same initial strain rate of 1×10~(-3) s~(-1) were 260％ at 473 K and 612％ at 523 K, respectively. Corresponding values for the ZK40 alloy processed by ECAP for only one pass were 124％ at 473 K and 212％ at 523 K, respectively; poor superplastic behavior of this material was related to the long-range stresses associated with the non-equilibrium grain boundaries within the coarse grains. The incompatibility between fine and coarse grains was thought to be unfavorable to the improvement of superplasticity.
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Low-temperature superplasticity of ZK40 magnesium alloy processed using equal channel angular pressing |
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| *Li LIN,Lijia CHEN,Wei WU,Zheng LIU,Teng LIU.Low-temperature superplasticity of ZK40 magnesium alloy processed using equal channel angular pressing[J].China Foundry,2004,1(1). |
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| Authors: | Li LIN Lijia CHEN Wei WU ZHENG Liu Teng LIU Shiding WU |
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| Abstract: | Microstructure evolution and superplastic behaviors of ZK40 magnesium alloy were investigated in the temperature range of 473～623 K. Transmission electron microscopy (TEM) was used to study the microstructure changes, twinning occurred significantly after being processed by equal channel angular pressing (ECAP) for one pass through the die, the mean grain size was 5.6 μm. Finer grains can be obtained after further processing through ECAP, the average grain size of the alloy processed by ECAP for three passes was as Iow as 0.8 μm; this alloy exhibited Iow temperature superplasticity at 473～523 K, elongations obtained at the same initial strain rate of 1 × 10-3 s-1 were 260 % at 473 K and 612 % at 523 K,respectively. Corresponding values for the ZK40 alloy processed by ECAP for only one pass were 124 % at 473 K and 212 % at 523 K, respectively; poor superplastic behavior of this material was related to the long-range stresses associated with the non-equilibrium grain boundaries within the coarse grains. The incompatibility between fine and coarse grains was thought to be unfavorable to the improvement of superplasticity. |
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| Keywords: | magnesium alloys grain refinement superplasticity ECAP |
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