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
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: Special Issue: Application of Synchrotron Radiation in Materials Research
• 页码范围: 157-162
• 页数: 6页
• 语种: 英文

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 Al89Ce 11 amorphous ribbon was investigated using differen-tial 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 → e-Al60Ce11 +fcc-Al→ η-Al41Ce5 +fcc-Al → Al11Ce3 +fcc-Al.It has been found that both e-Al60Ce11 and η-Al41Ce5 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.