Strain rate dependence in the nanoindentation-induced deformation of Mg-Al intermetallic compounds produced by packed powder diffusion coating

Chang, Haiwei, Lu, Mingyuan, Zhang, Mingxing, Atrens, Andrej and Huang, Han (2015) Strain rate dependence in the nanoindentation-induced deformation of Mg-Al intermetallic compounds produced by packed powder diffusion coating. Metals and Materials International, 21 5: 793-798. doi:10.1007/s12540-015-5055-9


Author Chang, Haiwei
Lu, Mingyuan
Zhang, Mingxing
Atrens, Andrej
Huang, Han
Title Strain rate dependence in the nanoindentation-induced deformation of Mg-Al intermetallic compounds produced by packed powder diffusion coating
Journal name Metals and Materials International   Check publisher's open access policy
ISSN 2005-4149
1598-9623
Publication date 2015-08-18
Sub-type Article (original research)
DOI 10.1007/s12540-015-5055-9
Open Access Status Not Open Access
Volume 21
Issue 5
Start page 793
End page 798
Total pages 6
Place of publication Seoul, Korea, Republic of
Publisher Daehan Geumsog Jae'lyo Haghoe / Korean Institute of Metals and Materials
Language eng
Formatted abstract
Nanoindentation was performed on τ-Mg32(Al, Zn)49 and β-Mg17Al12 intermetallic coatings and on a AZ91E Mg alloy substrate using loading rates of 0.03 to 30 mNs-1. Pop-in phenomenon was observed during loading in the two intermetallic coatings and in the substrate. Both the magnitude of the pop-ins and the time interval between two consecutive pop-ins increased with increasing loads. The phenomenon was attributed to plastic instability, which is known as the Portevin-Le Châtelier effect. The morphologies of the indent impressions at different strain rates on the τ phase, the β phase and the substrate were also investigated using atomic force microscopy. Pile-up occurred in the τ and β phases and was found independent of the strain rate; no obvious pile-up occurred on the AZ91E substrate. The AZ91E substrate exhibited creep rates greater than those of the intermetallic phases, and all of the creep rates increased with the loading rate.
Keyword Creep
Indentation
Intermetallic
Surface modification
Yield phenomena
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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