The role of the vacancy complexes of nanocompacted aluminum particles on the formation of structure during heat treatment

International Scientific Conference on "Radiation-Thermal Effects and Processes in Inorganic Materials"

材料科学;物理学

Gafner, Yu Ya^1 ; Baidyshev, V.S.^1

Abakan, Katanov State University of Khakassia, pr. Lenina 90, 655000, Russia^1

关键词: Degree of disorder;    Face centered cubic phase;    Molecular dynamics methods;    Pentagonal symmetries;    Stable Configuration;    Structural modifications;    Temperature factor;    Vacancy complexes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/81/1/012012/pdf
DOI  :  10.1088/1757-899X/81/1/012012

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The boundaries of thermal stability of the initial face-centered cubic (fcc) phase in perfect aluminum clusters with a diameter up to 3 nm have been investigated by the molecular dynamics method using a modified tight binding (TB-SMA) potential. Based on the performed computer analysis, it has been concluded that, in most cases, for aluminum clusters with sizes up to D = 2.5 nm, the most stable configuration is the structure with pentagonal symmetry. With a further increase in the number of atoms, the fcc structure becomes more stable. The influence of the degree of disorder of nanocompacted aluminum particles up to 4 nm in diameter on the formation of a crystal structure during heat treatment has been analyzed. It has been shown that, under the effect of the temperature factor, the clusters undergo a transition from the initial fcc phase to other structural modifications, including those with pentagonal symmetry, even in the case of clusters with fairly large sizes.