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Effect of rolling on microstructure and room temperature tensile properties of newly developed Mg-4Li-1Ca alloy
, , N. Prabhu, T. Al-Samman, Y. Estrin
Published in Trans Tech Publications
Volume: 922
Pages: 537 - 542
Mg-30Ca and Mg-14Li (wt %) master alloys were melted successively in the induction furnace to obtain a Mg-Li-Ca ternary alloy containing 3.99% Li and 1% Ca. The as-cast material of thickness 4 mm was homogenised at 350° C for 120 mins and subsequently rolled to 62.5% reduction in thickness at 300 °C to get 1.5 mm thick sheet. The microstructures of hot rolled samples were examined in as-rolled condition as well as after annealing at 350° C for various lengths of time. The presence of deformation twins was clearly seen in the as-rolled structure, whereas equiaxed twin-free grains were observed in the annealed condition. The average grain size was found to increase from 10 μm to 18 μm by annealing, according to the kinetics that follows a parabolic law. Tensile samples taken from rolled plate were deformed to failure at room temperature and a strain rate of 10-4 s-1. Ultimate tensile strength of as-rolled material increased to 213 MPa, while tensile elongation dropped to 6.5% from the initial values of 134 MPa and 8.5%, respectively. Annealing after rolling offered a good compromise between the enhanced tensile strength (160 MPa) and tensile ductility (9%) suggesting viability of the proposed thermomechanical treatment as a means for enhancing both strength and ductility of Mg -4Li-1Ca. © (2014) Trans Tech Publications, Switzerland.
About the journal
JournalAdvanced Materials Research
PublisherTrans Tech Publications