Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 652, Issue -, Pages 353-364Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.11.049
Keywords
Al-Si-Cu-Mg alloy; Cr-Zr-V-Ti-rich intermetallics; Ageing; Hardness; Elevated temperature strength
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Funding
- ecoENERGY Innovation Initiative ecoEII of Natural Resources Canada at CanmetMATERIALS
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- PREA
- NSERC-DAS Award
- CFI
- RRC program
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Ageing characteristics and high temperature tensile properties of the Al-7Si-1Cu-0.5Mg (wt%) alloy modified with transition metals Cr, Ti, V and Zr, were tested. The modified alloy formed the CriTi/V/Zr-rich dispersoid phases with a variety of morphologies. During isochronal ageing, the alloy reached a peak hardness of 92 HRF after a cycle at 200 degrees C for 1 h. The tensile test at room temperature showed that alloying additions increased the yield stress by 30% and ultimate tensile strength by 5%. With increasing the testing temperature from 25 degrees C to 300 degrees C, the yield strength and tensile strength decreased from 300 MPa to 184 MPa and from 313 MPa to 196 MPa, respectively. Fractographic analysis after tensile testing revealed that coarse intermetallics influenced the crack propagation. At lower temperature, the cleavage-type brittle fracture was dominant while at higher temperature the fully ductile cracking mode was present. It is believed that the Cr, Zr, Ti and V-containing dispersoid phases improved the alloy strength at the elevated temperature. Crown Copyright (C) 2015 Published by Elsevier B.V. All rights reserved.
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