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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12775
Title: Effect of stacking fault energy on mechanical properties and strengthening mechanisms of brasses processed by cryorolling
Authors: Dasharath S.M.
Koch C.C.
Mula, Suhrit
Published in: Materials Characterization
Abstract: In the present study, contribution of individual strengthening mechanisms has been analyzed to corroborate the improvement of the mechanical properties of cryorolled brasses of Cu-3.8% Zn and Cu-9.6%1 Zn compositions. The samples were cryorolled up to the maximum possible reduction in area after homogenized annealing (at 800°C for 4 h). After the cryodeformation, a remarkable ~ 12 times improvement of yield strength (YS) was observed for both the alloys compared to that of the homogenized samples. The improvement of the YS is found to be much higher compared to that reported in our earlier work [Mater. Des 67 (2015) 637-643], although alloying content is much less in the present study. This is attributed to the change in rolling design, which allowed deformation of the samples under LN2 during rolling. The short time ageing (20 min, 225-300°C) followed by cryorolling was found to enhance ductility without affecting the YS significantly. The solid solution strengthening by Zn in Cu leads to the decrease in the stacking fault energy which prevents the dynamic recovery and restricts the process of cross slip. Thereby, it helps to increase twining activity for further deformation. The TEM investigation confirmed that the formation of subgrains and nanotwins is responsible for the simultaneous improvement of strength and ductility. The analysis of different strengthening mechanisms revealed that the grain size refinement played the pivotal role in the improvement of the mechanical properties. © 2015 Elsevier Inc.
Citation: Materials Characterization (2015), 110(): 14-24
URI: https://doi.org/10.1016/j.matchar.2015.10.006
http://repository.iitr.ac.in/handle/123456789/12775
Issue Date: 2015
Publisher: Elsevier Inc.
Keywords: Cast brass
Cryorolling
Dislocation substructure
Electron microscopy
Nano twins
Ultrafine grain
ISSN: 10445803
Author Scopus IDs: 56491328100
57203364844
12783902100
Author Affiliations: Dasharath, S.M., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
Koch, C.C., Department of Materials Science and Engineering, NC State University, 911 Partner's Way, EB I, Raleigh, NC 27606, United States
Mula, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
Corresponding Author: Mula, S.; Department of Metallurgical and Materials Engineering, Indian Institute of TechnologyIndia
Appears in Collections:Journal Publications [MT]

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