材料科学
合金
原子探针
铝
相(物质)
纳米尺度
壳体(结构)
降水
作文(语言)
芯(光纤)
化学工程
冶金
复合材料
纳米技术
化学
物理
工程类
哲学
气象学
有机化学
语言学
作者
Matthew E. Krug,David C. Dunand,David N. Seidman
摘要
An Al–11.3Li–0.11Sc (at. %) alloy was double aged to induce first α′-Al3Sc and then δ′-Al3Li precipitates. Atom-probe tomography revealed both single-phase δ′-precipitates and core-shell α′∕δ′-precipitates (with respective average radii of 16 and 27nm and respective volume fractions of 12% and 9%) conferring a high strength to the alloy. Although the δ′-shells contain little Sc (∼0.027at.%), the α′-cores have a high Li content, with an average composition of Al0.72(Sc0.17Li0.11). The Li concentrations within the δ′-phase and the Li interfacial excess at the δ′∕α′-interface both exhibit wide precipitate-to-precipitate variations.
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