Metallurgical and Materials Transactions A

, Volume 49, Issue 6, pp 2499–2512 | Cite as

Deformation Mechanism and Recrystallization Relationships in Galfenol Single Crystals: On the Origin of Goss and Cube Orientations

  • Suok-Min NaEmail author
  • Malcolm Smith
  • Alison B. Flatau


In this work, deformation mechanism related to recrystallization behavior in single-crystal disks of Galfenol (Fe-Ga alloy) was investigated to gain insights into the influence of crystal orientations on structural changes and selective grain growth that take place during secondary recrystallization. We started with the three kinds of single-crystal samples with (011)[100], (001)[100], and (001)[110] orientations, which were rolled and annealed to promote the formation of different grain structures and texture evolutions. The initial Goss-oriented (011)[100] crystal mostly rotated into {111}〈112〉 orientations with twofold symmetry and shear band structures by twinning resulted in the exposure of rolled surface along {001}〈110〉 orientation during rolling. In contrast, the Cube-oriented (001)[100] single crystal had no change in texture during rolling with the thickness reduction up to 50 pct. The {123}〈111〉 slip systems were preferentially activated in these single crystals during deformation as well as {112}〈111〉 slip systems that are known to play a role in primary slip of body-centered cubic (BCC) materials such as α-iron and Fe-Si alloys. After annealing, the deformed Cube-oriented single crystal had a small fraction (<10 pct) of recrystallized Goss-oriented grains. The weak Goss component remained in the shear bands of the 50 pct rolled Goss-oriented single crystal, and it appeared to be associated with coalescence of subgrains inside shear band structures during primary recrystallization. Rolling of the (001)[110] single crystal led to the formation of a tilted (001)[100] component close to the 〈120〉 orientation, associated with {123}〈111〉 slip systems as well. This was expected to provide potential sites of nucleation for secondary recrystallization; however, no Goss- and Cube-oriented components actually developed in this sample during secondary recrystallization. Those results illustrated how the recrystallization behavior can be influenced by deformed structure and the slip systems.



This work was supported by Office of Naval Research (ONR) MURI Program Grant No. N000140610530.

Conflict of interest

The authors declare that they have no conflict of interest.


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© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  1. 1.Department of Aerospace EngineeringUniversity of MarylandCollege ParkUSA
  2. 2.Department of Mechanical EngineeringUniversity of MarylandCollege ParkUSA

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