3D local atomic structure evolution in a solidifying Al-0.4Sc dilute alloy melt revealed in operando by synchrotron X-ray total scattering and modelling

被引：13

作者：

Huang, Shi ^{[1
]}

Luo, Shifeng ^{[1
,2
]}

Qin, Ling ^{[1
]}

Shu, Da ^{[3
]}

Sun, Baode ^{[3
]}

Lunt, Alexander J. G. ^{[4
]}

Korsunsky, Alexander M. ^{[5
]}

Mi, Jiawei ^{[1
,3
]}

机构：

[1] Univ Hull, Dept Engn, Cottingham Rd, Kingston Upon Hull HU6 7RX, N Humberside, England

[2] Hefei Univ Technol, Sch Mat Sci & Engn, 193 Tunxi Rd, Hefei 230009, Peoples R China

[3] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

[4] Univ Bath, Dept Mech Engn, Bath BA2 7AY, Somerset, England

[5] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

来源：

SCRIPTA MATERIALIA | 2022年 / 211卷

基金：

中国国家自然科学基金;

关键词：

Aluminium-Scandium alloy Synchrotron; X-ray total scattering; Empirical Potential Structure Refinement; Liquid Atomic Structure; In Operando Study of Solidification; SCANDIUM; ORDER; BEHAVIOR;

D O I：

10.1016/j.scriptamat.2021.114484

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Using synchrotron X-ray total scattering and empirical potential structure refinement modelling, we studied systematically in operando condition the disorder-to-order local atomic structure transition in a pure Al and a dilute Al-0.4Sc alloy melt in the temperature range from 690 degrees C to 657 degrees C. In the liquid state, icosahedral short-range ordered Sc-centred Al polyhedrons form and most of them with Al coordination number of 10-12. As the melt is cooled to the semisolid state, the most Sc-centred polyhedrons become more connected atom clusters via vertex, edge and face-sharing. These polyhedrons exhibit partially icosahedral and partially face-centred-cubic symmetry. The medium-range ordered Sc-centred clusters with face-sharing are proved to be the "precursors" of the L1(2) Al3Sc primary phases in the liquidsolid coexisting state. (C) 2022 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

引用

页数：5

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