Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 800, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140309
Keywords
Magnesium; Creep; Twinning; Slip
Categories
Funding
- National Natural Science Foundation of China [51771230, 51974376, 52071344]
- Key Research Program of Hunan Province [2019WK2062]
- Natural Science Foundation of Hunan Province [2019JJ40376]
- Distinguished Professor Project of Central South University [202045009]
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This study investigated the effects of twinning time node on the creep resistance of an extruded Mg-2wt%Y sheet. Pre-compression with a low strain before creep resulted in a large amount of {10 (1) over bar2} twins, impacting the creep resistance of the samples. The dominant creep mechanisms differed between samples with and without pre-compression, with the presence of twins affecting the creep rate.
In this study, the effects of twinning time node on the creep resistance of an extruded Mg-2wt%Y sheet were investigated. Pre-compression with a low strain was applied along the normal direction at 298 K before creep, resulting in a large amounts of {10 (1) over bar2} twins. For comparing, the samples with and without pre-compression are referred to as PC and NPC, respectively. Compressive creep tests were performed along extrusion direction at 473 K and applied stress ranged from 30 to 70 MPa. The results showed that PC samples present a higher creep resistance than NPC samples. Using various characterization methods, different dominant creep mechanisms were found in two types of samples. The dominant creep mechanisms of NPC sample are cross-slip and twinning while pyramidal c+a a dislocations can easily penetrate into the twins activated during creep, leading to a lower creep resistance. Inversely, the preset twins can slow down the creep rate by retarding cross-slip.
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