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Temperature-dependent flow behavior and microstructural evolution during compression of as-cast Mg-7.7Al-0.4Zn

Kulkarni, Rahul R., Prabhu, Nityanand, Hodgson, Peter D. and Kashyap, Bhagwati P. 2016, Temperature-dependent flow behavior and microstructural evolution during compression of as-cast Mg-7.7Al-0.4Zn, Journal of materials engineering and performance, vol. 25, no. 10, pp. 4145-4156, doi: 10.1007/s11665-016-2269-z.

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Title Temperature-dependent flow behavior and microstructural evolution during compression of as-cast Mg-7.7Al-0.4Zn
Author(s) Kulkarni, Rahul R.
Prabhu, Nityanand
Hodgson, Peter D.
Kashyap, Bhagwati P.
Journal name Journal of materials engineering and performance
Volume number 25
Issue number 10
Start page 4145
End page 4156
Total pages 12
Publisher Springer
Place of publication New York, N.Y.
Publication date 2016-10
ISSN 1059-9495
1544-1024
Keyword(s) compressive behavior
flow hardening and flow softening
Mg-7.7Al-0.5Zn (AZ80) alloy
microstructure evolution
structure-property relationship
Summary The microstructure and mechanical properties improve substantially by hot working. This aspect in as-cast Mg-7.7Al-0.4Zn (AZ80) alloy is investigated by compression tests over temperature range of 30-439°C and at strain rates of 5 × 10−2, 10−2, 5 × 10−4 and 10−4 s−1. The stress exponent (n) and activation energy (Q) were evaluated and analyzed for high-temperature deformation along with the microstructures. Upon deformation to a true strain of 0.80, which corresponds to the pseudo-steady-state condition, n and Q were found to be 5 and 151 kJ/mol, respectively. This suggests the dislocation climb-controlled mechanism for deformation. Prior to attaining the pseudo-steady-state condition, the stress-strain curves of AZ80 Mg alloy exhibit flow hardening followed by flow softening depending on the test temperature and strain rate. The microstructures obtained upon deformation revealed dissolution of Mg17Al12 particles with concurrent grain growth of α-matrix. The parameters like strain rate sensitivity and activation energy were analyzed for describing the microstructure evolution also as a function of strain rate and temperature. This exhibited similar trend as seen for deformation per se. Thus, the mechanisms for deformation and microstructure evolution are suggested to be interdependent.
Language eng
DOI 10.1007/s11665-016-2269-z
Field of Research 0912 Materials Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2016, ASM International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30089466

Document type: Journal Article
Collection: Institute for Frontier Materials
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