Equal-channel angular extrusion of beryllium |
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Authors: | R D Field C T Necker K T Hartwig J F Bingert S R Agnew |
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Affiliation: | (1) the Microstructural Characterization Team, MST-6, Los Alamos National Laboratory, 87545 Los Alamos, NM;(2) the Mechanical Engineering Department, Texas A&M University, 77843-3123 College Station, TX;(3) Present address: Multifunctional Materials Branch, Naval Research Laboratory, 20375 Washington, DC;(4) Present address: the Oak Ridge National Laboratory, 37831-6115 Oak Ridge, TN;(5) Department of Materials Science and Engineering, University of Virginia, 22904-4745 Charlottesville, VA |
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Abstract: | The equal-channel angular extrusion (ECAE) technique has been applied to a powder metallurgy (P/M) source Be alloy. Extrusions
have been successfully completed on Ni-canned billets of Be at approximately 425 °C. No cracking was observed in the billets,
and significant grain refinement was achieved. In this article, microstructural features and dislocation structures are discussed
for a single-pass extrusion, including evidence of 〈c〉 and 〈c+a〉 dislocations. Significant crystallographic texture developed during ECAE, which is discussed in terms of this unique deformation
processing technique and the underlying physical processes which sustain the deformation.
This article is based on a presentation made in the symposium entitled “Defect Properties and Mechanical Behavior of HCP Metals
and Alloys” at the TMS Annual Meeting, February 11–15, 2001, in New Orleans, Louisiana, under the auspices of the following
ASM committees: Materials Science Critical Technology Sector, Structural Materials Division, Electronic, Magnetic & Photonic
Materials Division, Chemistry & Physics of Materials Committee, Joint Nuclear Materials Committee, and Titanium Committee. |
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