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Constitutive Behavior and Processing Map of As-cast Mg-8Y-6Gd-1Nd-0.17Zn Magnesium Alloy Com-pressed At Elevated Temperature
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Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University

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the Key Development Project of Sichuan Province (No. 2017GZ0399) and the 2017 Doctoral Innovation Fund Program of Southwest Jiaotong University (No. D-CX201733).

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    Abstract:

    The constitutive behavior and hot workability of as-cast Mg-8Y-6Gd-1Nd-0.17Zn magnesium alloy during the hot compression were investigated at elevated temperature (350 °C ~ 450 °C) and different strain rates (0.0001 s?1~0.1 s?1) under the ultimate compression ratio of 50%. The relationship among these deformation parameters of Mg-8Y-6Gd-1Nd-0.17Zn alloy could be adequately characterized by a sine hyperbolic equation. The experimental results show that both temperature and strain rate have important effects on the flow stress behavior of Mg-8Y-6Gd-1Nd-0.17Zn magnesium alloy, and the flow stress increased with lower temperature and higher strain rates. Typical dynamic recrystallization character is found in the true stress-strain curves when samples compressed above the temperature of 400 ℃. The activation energy (Q) and stress exponent (n) during deformation were 359.258 kJ/mol and 5.24, respectively. The average error (ARE) between experimental and calculated values is 3.37%. Then, the processing map was also established and analyzed based on dynamic material model. Considering the processing map and microstructures observation, the optimum hot-working parameters of the alloy were determined to be at a temperature of 400 °C ~ 450 °C and a strain rate of 0.0001 s-1 ~ 0.001 s-1.

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[Liu Chongliang, Quan Gaofeng, Zhou Mingyang, Guo Yangyang, Fan Lingling. Constitutive Behavior and Processing Map of As-cast Mg-8Y-6Gd-1Nd-0.17Zn Magnesium Alloy Com-pressed At Elevated Temperature[J]. Rare Metal Materials and Engineering,2020,49(8):2591~2598.]
DOI:10.12442/j. issn.1002-185X.20190435

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History
  • Received:May 22,2019
  • Revised:August 22,2019
  • Adopted:September 06,2019
  • Online: September 27,2020
  • Published: