Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 650, Issue -, Pages 190-196Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.09.061
Keywords
Magnesium alloys; Creep; Threshold stress; Dislocations
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Funding
- National Key Technologies RD Program [2013s05007GX, 2014-GX-216A, 2015DFH50210]
- National Natural Science Foundation of China [20921002]
- Joint research program of the Chinese Academy of Science
- Japan Society for the Promotion of Science (JSPS) [GJHZ1413]
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Tensile creep behavior of the high-pressure die-cast Mg-4Al-4La-0.4Mn alloy under stresses of 50-100 MPa and at 150-225 degrees C was thoroughly investigated. This alloy exhibits a stress exponent of approximately 6 and the activation energy Q falls within the range of 80-120 kJ/mol at 150-200 degrees C. From fitting results, the commonly adopted threshold stress approach is not suitable for ALa44 alloy, and the normalized stress exponent is approximately 7, suggesting that creep deformation of ALa44 alloy was controlled by low-temperature dislocation climb (core diffusion). Furthermore, the microstructural analysis results indicate that the rate-controlling creep mechanism of ALa44 alloy is dislocation climb, but the cell boundary disintegration and the dislocation cross-slip also assisted deformation during creep processes. (C) 2015 Elsevier B.V. All rights reserved.
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