Devitrification of Al-Ce Amorphous Ribbon Investigated Using In situ High Energy X-ray Diffraction  

作　　者：Ying-Xi Li Fan-Qiang Meng Rui Yuan Guo-Qiang Huang Dong-Bai Sun 

机构地区：[1]Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-Sen University,Zhuhai,519082,China [2]School of Materials Science and Engineering,Sun Yat-Sen University,Guangzhou,510275,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第1期157-162,共6页金属学报（英文版）

基　　金：the funding support from the National Key Research and Development program(No.2020YFC2200500);the support from“The Pearl River Talent Program”;the US Department of Energy,Office of Science,Office of Basic Energy Sciences,under Contract No.DE-AC02-06CH11357。

摘　　要：Metastable phases formed during vitrification or devitrification open an avenue to study the intrinsic structural hierarchy in amorphous materials.The phase transformation sequence of Al89Ce11 amorphous ribbon was investigated using diff erential scanning calorimetry,in situ high energy X-ray diffraction(HEXRD)and ex situ high-resolution scanning transmission electron microscope.The results reveal the devitrification pathway following the reaction:amorphous→ε-Al_(60)Ce_(11)+fcc-Al→η-Al_(41)Ce_(5)+fcc-Al→Al_(11)Ce_(3)+fcc-Al.It has been found that bothε-Al_(60)Ce_(11)andη-Al_(41)Ce_(5)metastable phases have same Ce-centered 1-6-6-6-1 motif,suggesting that the structural motif can be inherited.Formation of metastable phase with large unit cell is related to the short-range orders developed during solidification.Structural heredity provides a new method to tailor the microstructure and properties of Al-based alloys based on genetic mechanism.

关 键 词：Synchrotron radiation Amorphous alloys CRYSTALLIZATION Phase transformation 

分 类 号：TG139.8[一般工业技术—材料科学与工程]