• a comparative analysis of constitutive behaviors of mg–mn alloys with different heat-treatment parameters

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 454
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     mg–1.8mn (wt.%) alloy was solution-treated by three regimes to obtain different initial microstructures. isothermal hot compression tests were conducted in the temperature range of 250–450 °c and strain rate 0.01–1 s−1 for each of the initial states. constitutive constants for each initial state were obtained and compared. the results showed that homogenization of initial microstructure can significantly decrease the deformation resistance during hot working. it was also revealed that the dispersion of second-phase particles 1–1.5 μm in size with appropriate volume fraction (1–2%) and inter-particle spacing in initial microstructure can impart superior hot work deformation ability to the materials. excessive amounts of particles resulted in an increase of the flow stresses and working-hardening degree. a large volume fraction of nano-sized particles also imposed difficulty in plastic deformation but with less harmful effects than the larger-sized particles. the influencing mechanism of the particle distribution on the constitutive behavior is discussed.

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