Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 715, Issue -, Pages 186-193Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.01.003
Keywords
Mg-Gd-Ca alloy; Precipitates; Aging; Creep; Hardness
Categories
Funding
- National Natural Science Foundation of China [51201158, 51301048, 51401132]
- Science Research Project of Liaoning Province Education Department [L2016004, LQ2017014]
- Liaoning Province Doctor Startup Fund [20170520390, 20141080]
- Natural Science Foundation of Heilongjiang Province of China [E2017030]
- Foundation of State Key Laboratory of Rare Earth Resources Utilization [RERU2016025]
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How to effectively improve the precipitation hardness response of Mg alloys with relatively low RE content is an interesting and important topic. In the present study, an extra stress is added instead of just exposing the sample (extruded Mg-6Gd-1Ca alloy) in high temperature (175 degrees C) to modify the precipitation behavior and improve the hardness of alloy. Microstructural examinations of the aged alloy by transmission electron microscopy (TEM) show that the weak age-hardening response is mainly attributed to the low number intensity and relatively large size of precipitates in grains. The results suggest that the creep process can effectively promote precipitation response compared with the aging process. TEM analyses indicate a large amount of nano-scale precipitates (espically phase) can be formed in grains of the crept alloy, which is mainly responsible for the obvious hardness increase of the alloy after creep. Electron backscattered diffraction (EBSD) data suggest that the dislocation increase caused by strain during creep is responsible for the precipitate increase through providing more nucleation sites.
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