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Unconfined Twist: a Simple Method to Prepare Ultrafine Grained Metallic Materials

Published online by Cambridge University Press:  15 March 2011

Yonghao Zhao ,
Xiaozhou Liao  and
Yuntian T. Zhu
Yonghao Zhao
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM-87545, U.S.A.
Xiaozhou Liao
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM-87545, U.S.A.
Yuntian T. Zhu*
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM-87545, U.S.A.
*
corresponding author: [email protected]
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Abstract

A new simple method – unconfined twist was employed to prepare ultrafine grained (UFG) Fe wire. A coarse grained (CG) Fe wire with a diameter of 0.85 mm was fixed at one end, and twisted at the other end. After maximum twist before fracture, in the cross-sectional plane, concentrically deformed layers with a width of several micrometers formed surrounding the center axis of the wire. The near-surface deformed layers consist of lamella grains with a width in submicrometer range. In the longitudinal plane, deformed bands (with a width of several micrometers) formed uniformly, which were composed of lamella crystallites (with a width in submicrometer range). The tensile yield strength and ultimate strength of the twisted Fe wire are increased by about 150 % and 100 % compared with the values of its CG counterpart.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 821: Symposium P – Nanoscale Materials & Modeling-Relations Among Processing, Microstructure and Mechanical Properties , 2004 , P8.10
Copyright
Copyright © Materials Research Society 2004

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