|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Technology 2018
||C-70: Hot Forging Behavior of Mg-8Al-4Ba-4Ca (ABaX844) Alloy and Validation of Processing Map
||K.P. Rao, C. Dharmendra, Y.V.R.K. Prasad, Hajo Dieringa, Norbert Hort
|On-Site Speaker (Planned)
New cast alloys based on Mg-Al-Ba-Ca (ABaX) system show high temperature creep resistance. ABaX844 alloy is one of them and the processing map developed for this alloy exhibited two workability domains and dynamic recrystallization in the temperature and strain rate ranges: (1) 340–410<sup>o</sup>C and 0.0003–0.005 s<sup>-1</sup>, and (2) 425–500<sup>o</sup>C and 0.0003–0.1 s<sup>-1</sup>. The map also exhibited extensive flow instability under other conditions. The present study validates the findings of processing map by performing forging tests in the temperature range 300-500<sup>o</sup>C and forging speeds of 0.01, 0.1, 1 and 10 mm s<sup>-1</sup> to produce a cup shape component. Finite-element simulations were performed to obtain the strain and strain rate variations in the components during forging. The microstructures of forged specimens deformed under optimum process conditions revealed the formation of dynamically recrystallized grains whereas those forged under the conditions of flow instability have fractured and/or exhibited flow localization.