期刊
SCIENCE
卷 365, 期 6448, 页码 73-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaw2843
关键词
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资金
- National Key Research and Development Program of China [2017YFB0702001]
- National Natural Science Foundation of China [51601141, 51621063, 11504290, 11834018]
- 111 Project 2.0 [BP2018008]
- China Postdoctoral Science Foundation [2016M600788]
- Science and Technology Department of Shaanxi Province [2016KTZDGY-04-03, 2016KTZDGY-04-04]
- U.S. Department of Energy (BES-DMSE) [DE-FG02-16ER46056]
- U.S. National Science Foundation [CMMI-1635088]
- Australian Research Council
- NSF [DMR-1410636]
Lightweight magnesium alloys are attractive as structural materials for improving energy efficiency in applications such as weight reduction of transportation vehicles. One major obstacle for widespread applications is the limited ductility of magnesium, which has been attributed to (c + a) dislocations failing to accommodate plastic strain. We demonstrate, using in situ transmission electron microscope mechanical testing, that (c + a) dislocations of various characters can accommodate considerable plasticity through gliding on pyramidal planes. We found that submicrometer-size magnesium samples exhibit high plasticity that is far greater than for their bulk counterparts. Small crystal size usually brings high stress, which in turn activates more hc thorn ai dislocations in magnesium to accommodate plasticity, leading to both high strength and good plasticity.
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