Thermal Stability of Cryomilled Mg Alloy Powder

Dikai Guan, W. Mark Rainforth, Joanne Sharp, Junheng Gao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


In this paper, the thermal stability of cryomilled nanocrystalline (NC) AZ31 powder was evaluated by annealing at elevated temperature ranging from 350 to 450 °C. The results show the NC AZ31 powder exhibited excellent thermal stability during short anneals at 350–450 °C, and the mechanisms were investigated in detail. 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 1 h annealing. At 450 °C, the nano grains grew to 37 nm in the first 5 min and grew quickly to approximately 60 nm after 15 min. However, the grain growth was limited when the annealing time was increased to 60 min. 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.

Original languageEnglish
Title of host publicationMagnesium Technology 2017
EditorsKiran N. Solanki, Dmytro Orlov, Alok Singh, Neale R. Neelameggham
PublisherSpringer, Cham
Number of pages9
ISBN (Electronic)9783319523927
ISBN (Print)9783319523910, 9783319848952
Publication statusPublished - 24 Feb 2017
Externally publishedYes
EventInternational Symposium on Magnesium Technology 2017 - San Diego, United States
Duration: 26 Feb 20172 Mar 2017

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


ConferenceInternational Symposium on Magnesium Technology 2017
Country/TerritoryUnited States
CitySan Diego


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