High temperature deformation mechanisms and processing map for hot working of cast-homogenized Mg-3Sn-2Ca alloy

Research output: Contributions to collected editions/worksArticle in conference proceedingsResearchpeer-review

Authors

  • K. P. Rao
  • Y. V.R.K. Prasad
  • N. Hort
  • K. U. Kainer

The hot working behavior of Mg-3Sn-2Ca alloy has been investigated in the temperature range 300-500 °C and strain rate range 0.0003-10 s-1, with a view to evaluate the mechanisms and optimum parameters of hot working. For this purpose, a processing map has been developed on the basis of the flow stress data obtained from compression tests. The stress-strain curves exhibited steady state behavior at strain rates lower than 0.01 s-1 and at temperatures higher than 350 °C and flow softening occurred at higher strain rates. The processing map exhibited two dynamic recrystallization domains in the temperature and strain rate ranges: (1) 300-420 °C and 0.0003-0.003 s-1, and (2) 420-500 °C and 0.003-1.0 s-1, the latter one being useful for commercial hot working. Kinetic analysis yielded apparent activation energy values of 161 and 175 kJ/mole in domains (1) and (2) respectively. These values are higher than that for self-diffusion in magnesium suggesting that the large volume fraction of intermetallic particles CaMgSn present in the matrix generates considerable back stress. The processing map reveals a wide regime of flow instability which gets reduced with increase in temperature or decrease in strain rate.

Original languageEnglish
Title of host publicationTHERMEC 2009
EditorsTara Chandra, N. Wanderka, Walter Reimers, M. Ionescu
Number of pages6
PublisherTrans Tech Publications Ltd
Publication date2010
Pages3616-3621
ISBN (print)0878492941, 9780878492947
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
Duration: 25.08.200929.08.2009
Conference number: 6

    Research areas

  • Dynamic recrystallization, Hot workability, Kinetic analysis, Mg-Sn-Ca alloy, Processing map
  • Engineering

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