Effect of cryomilling time on microstructure evolution and hardness of cryomilled AZ31 powders
Effect of cryomilling time on microstructure evolution and hardness of cryomilled AZ31 powders
The synthesis of nanostructured AZ31 powder by cryomilling was studied in this paper. The microstructural evolution during cryomilling, including the changes of particle morphology and internal grain size, was characterized via optical microscopy, SEM, TEM and XRD. Observations during the cryomilling produced four main findings. Firstly, cryomilling can refine the grains of AZ31 particles down to 100 nm after around 1 h milling and the minimum average grain size of about 30 nm was reached when the cryomilling time was extended to 6 h or longer. Secondly, cold welding played a dominant role in the early stage of cryomilling, while fracture took place in the late stage and surpassed cold welding. The former led to a particle size increase while the latter decreased the particle size. The minimum average particle size after 6 h cryomilling was approximately 26 μm. Thirdly, a few particles were agglomerated with other particles and could not be processed by cryomilling due to cold welding. Finally, after cryomilling 6 h and longer times, the hardness reached 162 HV which was much higher than other values reported in AZ31 alloy studies.
Cryomilling, AZ31, TEM, XRD, Hardness, Grain refinement
Guan, Dikai
d20c4acc-342a-43fa-a204-7283f0cc33bf
Gao, Junheng
ff08c8df-b051-4ab1-bc03-3b6d68ab9d2e
Rainforth, W. Mark
7226983c-4ca1-4f0a-8191-02e3424dc98f
August 2021
Guan, Dikai
d20c4acc-342a-43fa-a204-7283f0cc33bf
Gao, Junheng
ff08c8df-b051-4ab1-bc03-3b6d68ab9d2e
Rainforth, W. Mark
7226983c-4ca1-4f0a-8191-02e3424dc98f
Guan, Dikai, Gao, Junheng and Rainforth, W. Mark
(2021)
Effect of cryomilling time on microstructure evolution and hardness of cryomilled AZ31 powders.
Materials Characterization, 178, [111311].
(doi:10.1016/j.matchar.2021.111311).
Abstract
The synthesis of nanostructured AZ31 powder by cryomilling was studied in this paper. The microstructural evolution during cryomilling, including the changes of particle morphology and internal grain size, was characterized via optical microscopy, SEM, TEM and XRD. Observations during the cryomilling produced four main findings. Firstly, cryomilling can refine the grains of AZ31 particles down to 100 nm after around 1 h milling and the minimum average grain size of about 30 nm was reached when the cryomilling time was extended to 6 h or longer. Secondly, cold welding played a dominant role in the early stage of cryomilling, while fracture took place in the late stage and surpassed cold welding. The former led to a particle size increase while the latter decreased the particle size. The minimum average particle size after 6 h cryomilling was approximately 26 μm. Thirdly, a few particles were agglomerated with other particles and could not be processed by cryomilling due to cold welding. Finally, after cryomilling 6 h and longer times, the hardness reached 162 HV which was much higher than other values reported in AZ31 alloy studies.
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Accepted/In Press date: 9 July 2021
e-pub ahead of print date: 15 July 2021
Published date: August 2021
Keywords:
Cryomilling, AZ31, TEM, XRD, Hardness, Grain refinement
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Local EPrints ID: 474159
URI: http://eprints.soton.ac.uk/id/eprint/474159
ISSN: 1044-5803
PURE UUID: 80ecd0a1-0afb-4571-be68-d23022a892a6
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Date deposited: 14 Feb 2023 17:46
Last modified: 17 Mar 2024 04:17
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Author:
Dikai Guan
Author:
Junheng Gao
Author:
W. Mark Rainforth
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