Journal
MATERIALS CHARACTERIZATION
Volume 151, Issue -, Pages 530-541Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2019.03.043
Keywords
Al-Li alloys; Equal-channel angular pressing (ECAP); Microstructural evolution; Strength; Plastic deformation
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Funding
- Fundamental Research Funds for the Central Universities [HHU2018B48414, HHU2017B01314]
- National Natural Science Foundation of China [51774109, 51701065]
- Key Research and Development Project of Jiangsu Province of China [BE2017148]
- Public Science & Technology Service Platform Program of Suqian City of China [M201614]
- Science & Technology Plan Program of Suzhou City of China [SYG201820]
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Overcoming the ductility inadequacy while maintaining relatively high strength of Al-Li alloys is in urgent need for developing new low-density and high-performance aerospace aluminum alloys. In this research, a warm multi-pass equal-channel angular pressing (ECAP) process was developed to simultaneously improve the strength and ductility of an Al-5.5Mg-1.6Li-0.1Zr alloy. The effects of the process on the microstructure evolution, plastic deformation and strengthening mechanism were also investigated. Results show that the ultimate strength (UTS) and elongation to failure (EL) of ultrafine-grained (UFG) alloy after 16 ECAP passes at 300 degrees C reach up to 476 MPa and 21.6% respectively, about 74% and 108% higher than those of the as-cast sample with coarse grains. The great improvement can be attributed to the coupling effect of the UFG microstructure and uniform distribution of large number of precipitates.
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