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Creep and microstructure of magnesium-aluminum-calcium based alloys

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Abstract

This article describes the creep and microstructure of Mg-Al-Ca-based magnesium alloys (designated as ACX alloys, where A stands for aluminum; C for calcium; and X for strontium or silicon) developed for automotive powertrain applications. Important creep parameters, i.e., secondary creep rate and creep strength, for the new alloys are reported. Creep properties of the new alloys are significantly better than those of the AE42 (Mg-4 pct* Al-2 pct RE**) alloy, which is the benchmark creep-resistant magnesium die-casting alloy. Creep mechanisms for different temperature/stress regimes are proposed. A ternary intermetallic phase, (Mg,Al)2Ca, was identified in the microstructure of the ACX alloys and is proposed to be responsible for the improved creep resistance of the alloys.

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Authors and Affiliations

  1. Materials and Processes Lab., General Motors Research and Development Center, 48090-9055, Warren, MI

    Alan A. Luo (Staff Research Engineer) & Bob R. Powell (Staff Research Scientist)

  2. Chemical and Environmental Sciences Lab., General Motors Research and Development Center, 48090-9055, Warren, MI

    Michael P. Balogh (Staff Research Scientist)

Authors
  1. Alan A. Luo
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  2. Bob R. Powell
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  3. Michael P. Balogh
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Additional information

All concentrations in wt. pct, unless otherwise stated.

RE stands for a combination of rare earth elements, i.e., misch metal, in this case.

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Luo, A.A., Powell, B.R. & Balogh, M.P. Creep and microstructure of magnesium-aluminum-calcium based alloys. Metall Mater Trans A 33, 567–574 (2002). https://doi.org/10.1007/s11661-002-0118-1

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  • DOI: https://doi.org/10.1007/s11661-002-0118-1

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