Accessible Requires Authentication Published by De Gruyter January 31, 2020

Processing and properties of ultrafine-grained Mg-3Al-1Zn magnesium alloy microtubes fabricated via isothermal hot microforming of SPD processed precursors

Tohid Khandani, Ghader Faraji and Hamid Reza Torabi

Abstract

In the present paper, a new method for producing ultrafine grained microtubes of AZ31 magnesium alloy is proposed. The method consists of performing isothermal hot micro-backward extrusion on severe plastic deformation processed samples. One-pass equal channel angular pressing (ECAP) and cyclic extrusion compression angular pressing forward extrusion (CECAP-FE) were performed on an as-cast coarse-grained Mg-3Al-1Zn magnesium alloy before microtube fabrication. Microstructure and microhardness of the samples before and after micro-backward extrusion and deformation force during the fabrication process were studied. As a result, it was revealed that the proposed method performed on CECAP-FEed precursors could effectively produce ultrafine grained AZ31 magnesium alloy microtubes with excellent microhardness, good uniformity in shape, microstructure, and microhardness.


Correspondence address, Ghader Faraji, University of Tehran, Tehran 11155-4563, Iran. Tel./Fax: +98 2161119966, E-mail:

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Received: 2019-04-27
Accepted: 2019-08-13
Published Online: 2020-01-31
Published in Print: 2020-02-12

© 2020, Carl Hanser Verlag, München