|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Thermal Stability of Cryomilled Mg Alloy Powder
||Dikai Guan, Mark Rainforth, Joanne Sharp, Junheng Gao
|On-Site Speaker (Planned)
In this paper, the thermal stability of cryomilled nanocrystalline AZ31 powder was evaluated by annealing at elevated temperature ranging from 350 °C to 450 °. There were two separate growth stages with a transition point at around 400 °C. More specifically, between 350 and 400 °C, NC Mg grains were stable at approximately 32 nm, even after 1h annealing. At 450 °C, the nano grains grew to 37 nm in the first 5 minutes and grew quickly to approximately 60 nm after 15 minutes. However, the grain growth was limited when the annealing time was increased to 60 minutes. The average grain size remained stable less than approximately 60 nm even after long anneals at temperatures as high as 450 °C (0.78 T/TM), indicating an outstanding degree of grain size stability. This excellent thermal stability can be mainly attributed to solute drag and Zener pinning.