Multi-microalloying mediated grain growth and texture evolution during the high-temperature static recrystallization of AZ80 alloys

Y, (Y + Nd), and (Y + Ca) multi-microalloying, which has potential to mediate the grain growth and texture evolution, played an important role in the mechanical properties of the studied extruded AZ80 sheet. Quasi-in-situ electron backscattered diffraction results revealed that grain boundary migration and grain rotation simultaneously occurred during the grain growth. All these three microalloying combinations effectively lowered the grain growth rate. In particular, the AZ80 + 0.2Y+0.15Ca maintained the lowest growth rate and the most uniform fine grain structure. The rare-earth (RE) texture components, which temporarily formed in AZ80 + 0.2Y and AZ80 + 0.1Y+0.1Nd, weakened their basal texture intensity. In contrast, continuously enhanced basal texture, accompanied by grain growth, dominated the texture evolution in AZ80 + 0.2Y+0.15Ca. As a result, all microalloyed combinations exhibited lower Vickers hardness than that of AZ80. The microalloying also reduced the hardness anisotropy of the sheets. (c) 2020 Elsevier B.V. All rights reserved.