Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 788, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.139611
Keywords
LA141; Yb; Cryogenic rolling; Al3Yb particle; SFs
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Funding
- National Natural Science Foundation of China [51671063, 51771060, 51871068, 51971071]
- Domain Foundation of Equipment Advance Research of 13th Five-year Plan [61409220118]
- Fundamental Research Funds for the Central Universities [HEUCFG201834]
- Harbin City Application Technology Research and Development Project [2017RAQXJ032]
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Microstructure and mechanical properties of cryogenic-rolled LA141-xYb (x = 0, 0.1) alloys were investigated. With the addition of Yb, the grains of the alloy are refined, and some fine Al3Yb phases are formed. The submicron scale dynamic recrystallized grains can be observed in the cryogenic rolled specimen. The addition of Yb inhibits the dynamic recrystallization and refines the grains during cryogenic rolling. As a result, the work softening is greatly reduced, and the strength is significantly increased. The results show that, due to the addition of Yb, the ultimate tensile strength of as-cast and CR-processed alloys is increased by 14.5% and 40.1%, respectively, reaching 197 MPa and 241 MPa. It is mainly caused by the combined effects of refinement, dispersive fine Al3Yb particles, high density dislocation and stack faults (SFs).
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