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research-article

Micro deep drawability of superplastic Zn-22Al alloy at a high strain rate and room temperature

[+] Author and Article Information
Mehmet Emin Çetin

Department of Space and Satellite Engineering Konya, 42090 Turkey mecetin@erbakan.edu.tr

Ömer Necati Cora

Department of Mechanical Engineering KTU Makine Muhendisligi Bolumu Trabzon, 61080 Turkey oncora@ktu.edu.tr

Hasan Sofuoglu

Department of Mechanical Engineering College of Engineering Trabzon, 61080 Turkey sofuoglu@ktu.edu.tr

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received March 23, 2019; final manuscript received July 20, 2019; published online xx xx, xxxx. Assoc. Editor: Khaled Morsi.

ASME doi:10.1115/1.4044440 History: Received March 23, 2019; Accepted July 20, 2019

Abstract

This study aimed to investigate the micro deep drawability of Zn-22Al alloy at room temperature in which it shows superplastic properties. To this goal, two-step equal channel angular extrusion (ECAE) process was carried out to obtain an ultra-fine grained structure (UFG), first. Upon achieving the grain size of 200 nm, the formability of the alloy at room temperature and at a high strain rate was investigated both experimentally and numerically. Micro deep drawing experiments were performed at different deep drawing ratios (1.66, 1.84, 2.0 and 2.25) and for different sheet thicknesses (0.2, 0.4 and 0.6 mm). Finite element model of the micro deep drawing was also established to assess and compare the thickness variation in deep drawn parts. Results showed that the superplastic Zn-22Al alloy has a great potential in microforming applications. It was also noted that the limiting drawing ratio can be obtained as high as 2.25 in room temperature condition.

Copyright © 2019 by ASME
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