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. Attached Files Name Description MIMEType Size Downloads 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 Collections: Institute for Frontier Materials GTP Research Related Links Link Description Connect to published version Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 28 Nov 2016, 14:18:51 EST Tue, 29 Nov 2016, 04:01:50 EST Tue, 29 Nov 2016, 07:06:04 EST Wed, 22 Mar 2017, 14:24:47 EST Thu, 23 Mar 2017, 05:05:05 EST Fri, 07 Apr 2017, 14:55:50 EST Fri, 07 Apr 2017, 14:58:36 EST Filtered Full Citation counts:   Cited 0 times in TR Web of Science Cited 0 times in Scopus Search Google Scholar Access Statistics: 175 Abstract Views, 3 File Downloads  -  Detailed Statistics Created: Wed, 22 Mar 2017, 14:24:47 EST

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