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research-article

Effect of grain orientation on indentation induced creep in pure zinc

[+] Author and Article Information
Aditya Gokhale

Indian Institute of Technology Delhi Department of Materials Science and Engineering NEW DELHI, DELHI 110016 India adityagokhale369@gmail.com

R. Sarvesha

IIT Kanpur IIT Kanpur, UP 110016 India sarveshaswamy@gmail.com

Rajesh Prasad

IIT Delhi Hauz Khas Delhi, Delhi 110096 India rajesh@am.iitd.ac.in

Sudhanshu S. Singh

IIT Kanpur IIT Kanpur, UP 110016 India sudhanss@iitk.ac.in

Jayant Jain

5828 THUNDERBIRD BLVD. VANCOUVER, V6T0B8 India jainjayan@gmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received April 16, 2019; final manuscript received July 19, 2019; published online xx xx, xxxx. Assoc. Editor: Francis Aviles.

ASME doi:10.1115/1.4044438 History: Received April 16, 2019; Accepted July 19, 2019

Abstract

The study presents the anisotropy in the indentation creep response of zinc. Indentation creep tests were conducted on grains with three different orientations viz, <0001>, <112̅0> and <101̅0>. Basal grains showed a pronounced creep exhibiting a 25% higher creep displacement as compared to perpendicular to basal orientations. However, the recovery observed was highest for basal oriented grains wherein a recovery of 50% to its indented depth was observed, whereas for <112̅0> the recovery observed was 30%. The stress exponent, n, was obtained by employing two different approaches for each of the orientations and a difference in the stress exponent value was also observed highlighting the anisotropic creep response. Basal and non-basal oriented grains showed a lower (n ≅ 1.6) and higher stress exponent (n ≅ 5) respectively, highlighting the different operable creep mechanism. Surface topography using AFM revealed twinning and sink-in for <112̅0> and <101̅0> whereas uniform pile up was observed for basal grain.

Copyright © 2019 by ASME
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