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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11446
Title: Enhancement of mechanical properties of low stacking fault energy brass processed by cryorolling followed by short-annealing
Authors: Kumar R.
Dasharath S.M.
Kang P.C.
Koch C.C.
Mula, Suhrit
Published in: Materials and Design
Abstract: The mechanical properties and microstructural characteristics of ultrafine grained low stacking faulty energy (SFE) brass processed by cryorolling were investigated in the present work. The commercial brass with 18. wt.% Zn was subjected to cryorolling to obtain specimens with different percentage of reduction in area (RA). Short time post-processing annealing was carried out for the specimens with maximum RA (90%) to enhance their ductility. The mechanical properties of all the specimens were assessed by tensile tests and hardness measurements. Microstructural analysis was carried out by optical microscopy, X-ray diffraction (XRD), atomic force microscopy (AFM) and electron microscopy (EM). The maximum yield strength (YS) of 600. MPa with 2.1% ductility was obtained for the cryorolled samples with 90% RA. The YS decreased to 452. MPa with a corresponding increase in the ductility (10%) after annealing at 225. °C. The YS of the cryorolled. + annealed sample is found to be 465% higher compared to that of the as-received specimens (YS. = 80. MPa). Fractography analysis of the 90% rolled specimens showed a brittle fracture; while, presence of dimples marks on the fractured surface of the annealed specimens indicated a ductile failure. The low SFE of the alloy plays a vital role on the deformation mechanisms during cryorolling and simultaneous improvement of the YS and ductility. Hence, improvement in the mechanical properties has been discussed in the light of refinement of microstructure, formation of sub-grains and nano-twins driven by the low SFE. © 2014 Elsevier Ltd.
Citation: Materials and Design (2015), 67(): 637-643
URI: https://doi.org/10.1016/j.matdes.2014.11.014
http://repository.iitr.ac.in/handle/123456789/11446
Issue Date: 2015
Publisher: Elsevier Ltd
Keywords: Cryorolling
Ductile fracture
Electron microscopy
Nanotwins
Tensile yield strength
Ultrafine grain
ISSN: 2613069
Author Scopus IDs: 55389796000
56491328100
7007182376
57203364844
12783902100
Author Affiliations: Kumar, R., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Rookee, Uttarakhand, 247667, India
Dasharath, S.M., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Rookee, Uttarakhand, 247667, India
Kang, P.C., School of Materials Science and Engineering, Harbin Institute of Technology, Harbin Heilongjiang, 150001, China
Koch, C.C., Department of Materials Science and Engineering, NC State University, 911 Partner's Way EB I, Room 3002, Raleigh, NC 27606, United States
Mula, S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Rookee, Uttarakhand, 247667, India
Corresponding Author: Mula, S.; Department of Materials Science and Engineering, State University, 911 Partner's Way EB I, Room 3002, United States
Appears in Collections:Journal Publications [ME]
Journal Publications [MT]

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