期刊
ACTA MATERIALIA
卷 59, 期 4, 页码 1436-1444出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.11.005
关键词
Semi-solid behaviour; Al-Cu alloys; X-ray radiography; Deformation; Fracture
资金
- EPSRC [EP/F001452]
- NSERC
- CCMX
- ALCOA
- Dorothy Hodgkin Postgraduate Award
- EPSRC [EP/F001452/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F001452/1] Funding Source: researchfish
Semi-solid deformation has been directly observed in an Al-12 wt.% Cu alloy through the combination of real-time synchrotron Xray radiography and a bespoke high-temperature tensile tester over a range of fraction solid from 0.35 to 0.98. During deformation at low and moderate fraction solids, the X-ray radiographs indicate that there is significant feeding of interdendritic liquid in the region of strain localization prior to crack formation. Furthermore, the measured load required to initiate localized tensile deformation was found to be similar over the range of fraction solid 0.35 to 0.66. At higher fraction solids, the radiographic observations are consistent with classical hot tearing behaviour: limited liquid flow due to low permeability; void nucleation and coalescence; and final failure. Based on these results, a three-stage mechanism for semi-solid failure is proposed which includes the effects of liquid flow and micro-neck formation. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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