Double-shell structure of Al3（Zr,Sc） precipitate induced by thermomechanical treatment of Al-Zr-Sc alloy cable
来源期刊：Journal of Rare Earths2019年第6期
论文作者：Jiayi Zhang Tao Hu Danqing Yi Hongxuan Wang Bin Wang
文章页码：668 - 672
摘 要：A spheroidal Al3（Zr,Sc） precipitate with a double-shell structure, comprising a Sc-enriched core enveloped by a Zr-enriched inner shell and a Sc-enriched outer shell（～9 nm in thickness）, appears in an Al-0.2 Zr-0.1 Sc alloy cable after thermomechanical treatment. The average diameter of the spheroidal Al3（Zr,Sc） precipitate is approximately 80 nm. The double-shelled Al3（Zr,Sc） precipitate presents three different interfaces and is semi-coherent with the Al matrix. Atom probe tomography（APT） analyses further show that the outer shell of Al3（Zr,Sc） precipitate is Sc element enrichment. The electrical conductivity of Al-0.2 Zr-0.1 Sc alloy cable increases by 6.5 MS/m within the aging time from 0.2 to 100 h at 350 ℃, with double-shelled Al3（Zr,Sc）precipitate.
Jiayi Zhang1,2，Tao Hu1，Danqing Yi1,2，Hongxuan Wang3，Bin Wang1,2
1. School of Material Science and Engineering,Central South University2. Light Alloy Research Institute,Central South University3. School of Mechanical Engineering,South China University of Technology
摘 要：A spheroidal Al3（Zr,Sc） precipitate with a double-shell structure, comprising a Sc-enriched core enveloped by a Zr-enriched inner shell and a Sc-enriched outer shell（～9 nm in thickness）, appears in an Al-0.2 Zr-0.1 Sc alloy cable after thermomechanical treatment. The average diameter of the spheroidal Al3（Zr,Sc） precipitate is approximately 80 nm. The double-shelled Al3（Zr,Sc） precipitate presents three different interfaces and is semi-coherent with the Al matrix. Atom probe tomography（APT） analyses further show that the outer shell of Al3（Zr,Sc） precipitate is Sc element enrichment. The electrical conductivity of Al-0.2 Zr-0.1 Sc alloy cable increases by 6.5 MS/m within the aging time from 0.2 to 100 h at 350 ℃, with double-shelled Al3（Zr,Sc）precipitate.
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