Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 746, Issue -, Pages 11-26Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.12.099
Keywords
Al alloys; Microstructure; Homogenization; Solute segregation; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51621063, 51625103, 51722104, 51790482]
- 111 Project of China [BP2018008]
- International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies
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Microstructures and mechanical properties of homogenized Al-2.5 wt% Cu (Al-Cu), Al-2.5 wt%Cu-0.3 wt%Sc (Al-Cu-Sc) and Al-2.5 wt%Cu-0.3 wt%Sc-0.2 wt% Fe (Al-Cu-Sc-Fe) alloys were comprehensively studied, which allowed to demonstrate the single Sc effect as well as the combined Sc and Fe effect on microstructural evolution during homogenization treatment and hence on mechanical response, respectively. It was clearly revealed that the single minor Sc addition refined the grains of as-cast Al-Cu alloy, and induced Sc enrichment in the micro sized alpha-Al/theta-Al2Cu eutectic. During homogenization, the Sc distribution highly affected the formation of micron sized (Cu,Sc)-rich W-phases and submicro/nano-sized Al3Sc dispersoids. In comparison, the co-addition of minor Fe and Sc produced grains and micro Sc-segregation similar to the single Sc addition. However, the formation of W phase was highly suppressed. This resulted in promoted Al3Sc dispersoid formation during homogenization and led to improved strength. Unfortunately, coarse (Cu, Fe) -rich constituents were newly created in the homogenized Al-Cu-Sc-Fe alloy, and the ductility of alloy was correspondingly reduced.
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