The interaction of precipitation and deformation in a binary Mg-Ca alloy at elevated temperatures

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  • M. Lalpoor
  • A. Miroux
  • C. L. Mendis
  • N. Hort
  • S. E. Offerman

The effect of pre-deformation on precipitation hardening response as well as the work-hardening behavior of a binary Mg-Ca alloy are investigated. Our results show that application of 5% pre-deformation increases the precipitation hardening response of the material and decreases the annealing time by 50%. The dislocations introduced during the pre-deformation process act as predominant nucleation sites and result in a higher number of precipitates of smaller size. During the thermomechanical treatments, the work hardening behavior is altered by the state of the precipitates, namely, under-aged, peak-aged and over-aged. After the elastic-plastic transition, under-aged and peak-aged materials show a continuously decreasing work-hardening rate, while the over-aged material has an initial constant work-hardening rate. The absolute values of the work hardening rate are far less sensitive to the precipitation stage compared to aluminum alloys; a fact that explains the low work hardening capacity of magnesium compared to aluminum.

Original languageEnglish
JournalMaterials Science and Engineering A
Pages (from-to)116-124
Number of pages9
Publication statusPublished - 15.07.2014
Externally publishedYes

    Research areas

  • Materials scarcity, Mg-Ca alloys, Precipitation, Thermomechanical treatment, Work hardening
  • Engineering