Precipitation behavior and high strain rate superplasticity in a novel fine-grained aluminum based alloy
作者： A.V. Mikhaylovskaya , A.A. Kishchik , A.D. Kotov , O.V. Rofman , N. Yu. Tabachkova
DOI: 10.1016/J.MSEA.2019.05.099
关键词: Strain rate 、 Intermetallic 、 Grain size 、 Nucleation 、 Alloy 、 Ultimate tensile strength 、 Zener pinning 、 Superplasticity 、 Composite material 、 Materials science
摘要: Abstract The development of aluminum alloys with superior mechanical properties and high strain rate superplasticity is an important prerequisite for advancing applications superplastic blow-forming technology. This study focuses on the effect Ce Fe additions microstructural parameters tensile a Al-4.8%Mg-0.6%Mn-0.15%Cr (AA5083-type) alloy. studied alloy exhibits bimodal particle size distribution coarse crystallization origin inclusions fine secondary precipitates. Both particles lead to grain refinement. Ce-, Fe-, Mn-rich intermetallic provide evidence particle-stimulated nucleation effect. semi-coherent Mn-enriched compact-shaped dispersoids Ashby-Brown contrast, quasicrystalline structure, mean 38 nm are precipitated after low-temperature homogenization exhibit strong Zener pinning proposed thermomechanical treatment results in 4 μm ultimate strength 340 MPa recrystallized sheet. deformation behavior range 1 × 10−2 1 × 10−1 s−1 associated strain-induced changes structure developed presented discussed.
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