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        Forging of cast Mg-3Sn-2Ca-0.4Al-0.4Si magnesium alloy using processing map

        K. P. Rao,K. Suresh,Y. V. R. K. Prasad,N. Hort,K. U. Kainer 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.6

        Mg-3Sn-2Ca (TX32) alloy has good creep resistance but limited workability. Minor amounts of Al and Si have been added to TX32 for improving its hot workability. The processing map for the TX32-0.4Al-0.4Si alloy exhibited two workability domains in the temperature and strain rate ranges: (1) 310-415°C/0.0003-0.003 s -1 and (2) 430-500°C/0.003-3 s -1 . The alloy exhibited flow instability at temperatures < 350°C at strain rates > 0.01 s -1 . The alloy has been forged to produce a cup shape component to validate these findings of processing map. Finite-element (FE) simulation has been performed for obtaining the local variations of strain and strain rate within the forging. The microstructures of the forged components under the optimal domain conditions revealed dynamically recrystallized grains, and those forged in the flow instability regime have fractured and exhibited flow localization bands and cracks. The experimental loadstroke curves correlated well with those obtained by FE simulation.

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        Comparative Study of Microstructure and Texture of Cast and Homogenized TX32 Magnesium Alloy After Hot Deformation

        C. Dharmendra,K. P. Rao,Y. V. R. K. Prasad,N. Hort,K. U. Kainer 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.1

        The effect of homogenization on the hot deformation behavior and texture evolution of Mg-3Sn-2Ca (TX32)alloy is investigated. The cast-homogenized alloy samples were hot compressed in the temperature and strainrate ranges of 300-500 °C and 0.0003-10 s-1,respectively, and a processing map has been developed by using theflow stress data. The map revealed two dynamic recrystallization (DRX) domains with a peak efficiency of 44%at 360 °C/0.0003 s-1(Domain 1) and 43% at 485 ○C/0.1 s-1(Domain 2). When compared with the map for as-castcondition, it is observed that both the domains moved towards higher temperatures although the shift ofDomain 1 is more noticeable. The apparent activation energy values in the two domains and the regime of flowinstability are nearly unchanged by homogenization, suggesting that Mg2Ca and CaMgSn particles in themicrostructure are thermally stable. Specimens deformed under conditions in Domain 1 have high Schmid factorsfor {0001} <1120> basal slip and {1100} <1120> prismatic slip, while in Domain 2 the deformation progresseddue to {112 2} <112 3> second-order pyramidal slip.

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