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Creep deformation mechanism of magnesium-based alloys

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Abstract

Two heat-resistant magnesium alloys AJC421 and Mg-2Nd were prepared. Both as-cast Mg-2Nd and AJC421 alloys exhibited good creep resistance in comparison with commonly used magnesium alloys. The improvement in creep properties through Nd addition to pure magnesium is attributed to both solid solution and precipitation hardening. The stress exponents of 4.5–5.5 and activation energies of 70.0–96.0 kJ/mol obtained from the as-cast Mg-2Nd alloy at low temperatures and low stresses indicate the five power law can be used for predicting the creep mechanism. The additions of alkaline earth elements Sr and Ca into Mg–Al alloys suppress the discontinuous precipitation of Mg17Al12 and form thermal-stable intermediate phases at grain boundaries, leading to effective restriction to grain boundary sliding and migration. However, the mechanism responsible for creep deformation of Mg–Al based alloys with Ca and Sr additions is not consistent with the results of microstructure observations performed on the alloys before and after creep tests.

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Acknowledgement

This research was supported by the Natural Science Foundation of Jiangsu Province (No. BK2004208) and the Foundation for Excellent Doctoral Dissertation of Southeast University.

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Authors and Affiliations

  1. Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University, Nanjing, 211189, People’s Republic of China

    Jingli Yan, Yangshan Sun, Feng Xue & Jing Bai

  2. Ford Motor Research & Engineering (Nanjing) Co. Ltd., Nanjing, 211100, People’s Republic of China

    Shan Xue

  3. Nanjing Welbow Metals Co. Ltd., Honglan, Nanjing, 211221, People’s Republic of China

    Weijian Tao

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  1. Jingli Yan
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  3. Feng Xue
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Correspondence to Yangshan Sun.

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Yan, J., Sun, Y., Xue, F. et al. Creep deformation mechanism of magnesium-based alloys. J Mater Sci 43, 6952–6959 (2008). https://doi.org/10.1007/s10853-008-2968-4

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