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Mechanical properties and determination of slip systems of the B2 YZn intermetallic compound

TitleMechanical properties and determination of slip systems of the B2 YZn intermetallic compound
Publication TypeJournal Article
Year of Publication2010
AuthorsCao GH, Becker AT, Wu D, Chumbley LS, Lograsso TA, Russell AM, Gschneidner KA
Journal TitleActa Materialia
Volume58
Pages4298-4304
Date Published07/01
ISBN Number1359-6454
Accession NumberISI:000279277500023
Keywordsaluminides, deformation-behavior, ductility, fracture-toughness, intermetallics, mechanical properties, slip, transmission electron microscopy (tem), yag, ycu, yzn
Abstract

Single crystal specimens of YZn (B2) were tested in tension at room temperature. Specimens with a [1 0 1] tensile axis orientation exhibited {0 1 1} < 1 0 0 > primary slip and an ultimate tensile strength of 365 MPa at 3.7% elongation. Specimens with [0 0 1] and [1 1 1] tensile axis orientations showed no slip lines and fractured at a stress of 180 MPa at 3.3% and 130 MPa at 2.9% elongation, respectively. Transmission electron microscopy (TEM) examination of the Burger's vector of dislocations in tensile tested specimens revealed < 1 0 0 >-type dislocations. TEM analysis suggested that a secondary slip system, {0 0 1} < 1 0 0 >, may be active. Banded features with a {0 2 1} orientation were observed in deformed YZn; these may be slip traces produced by the cross-slip of < 1 0 0 > dislocations. Acting together, {0 1 1} < 1 0 0 > and {0 0 1} < 1 0 0 > slip provide only three independent slip systems, and no extra independent systems are provided by the cross-slip. This finding is consistent with the low ductility of YZn. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URL<Go to ISI>://000279277500023
DOI10.1016/J.Actamat.2010.04.024