@article{Chaudry2024, 
author = {Umer Masood Chaudry and Hafiz Muhammad Rehan Tariq and Nooruddin Ansari and Soo Yeol Lee and Tea-Sung Jun},
title = {Room and cryogenic deformation behavior of AZ61 and AZ61-xCaO (x = 0.5, 1 wt.%) alloy},
year = {2024},
journal = {Journal of Magnesium and Alloys},
volume = {12},
number = {5},
pages = {1996-2009},
keywords = {Magnesium, Twinning, Twinning variant, EBSD, Cryogenic deformation},
url = {https://www.sciopen.com/article/10.1016/j.jma.2024.04.021},
doi = {10.1016/j.jma.2024.04.021},
abstract = {This study investigates the influence of CaO (0.5, 1 (wt.%)) alloying on the microstructural evolution, texture development and deformation behavior of AZ61 magnesium alloy. The uniaxial tension tests at room (RT) and cryogenic (CT, -150 ℃) temperature were performed to investigate the twinability and dislocation behavior and its consequent effect on flow stress, ductility and strain hardening rate. The results showed that the AZ61-1CaO exhibited superior strength/ductility synergy at RT with a yield strength (YS) of 223 MPa and a ductility of 23% as compared to AZ61 (178 MPa, 18.5%) and AZ61-0.5CaO (198 MPa, 21%). Similar trend was witnessed for all the samples during CT deformation, where increase in the YS and decrease in ductility were observed. The Mtex tools based in-grain misorientation axis (IGMA) analysis of RT deformed samples revealed the higher activities of prismatic <a> slip in AZ61-CaO, which led to superior ductility. Moreover, subsequent EBSD analysis of CT deformed samples showed the increased fraction of fine {10-12} tension twins and nucleation of multiple {10-12} twin variants caused by higher local stress concentration at the grain boundaries, which imposed the strengthening by twin-twin interaction. Lastly, the detailed investigations on strengthening contributors showed that the dislocation strengthening has the highest contribution towards strength in all samples.}
}