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arXiv · 2404.18050

Deformability, inherent mechanical properties and chemical bonding of Al11Nd3 in Al-Nd target material

Xue-Qian Wang·Run-Xin Song·Xu Guan·Shuan Li·Shuchen Sun·Hongbo Yang·Daogao Wu·Ganfeng Tu·Song Li·Hai-Le Yan·Liang Zuo
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Abstract

Microstructure uniformity of the Al-Nd target materials with Al11Nd3 significantly affects the performance of the fabricated film, which is widely used as wiring material in largesize thin-film transistor liquid crystal display (TFT-LCD) panels. Understanding the inherent mechanical properties and chemical bonds of Al11Nd3 is crucial for homogenizing the Al-Nd target. Here, by a combined experimental and ab-initio theoretical study, the microstructure and deformability of the Al-3wt%Nd alloy and the inherent mechanical properties and chemical bonds of Al11Nd3 are investigated comprehensively. The Al-3wt%Nd alloy is composed of the pre-eutectic {\alpha}-Al matrix and the eutectic {\alpha}-Al and a high stable {\alpha}-Al11Nd3 phases. During the plastic deformation, the eutectic microstructure transforms from a cellular to a lamellar shape, while the morphology and dimension of {\alpha}-Al11Nd3 are not changed significantly. By examining ideal tensile strength, elastic moduli, hardness and brittleness-ductility, the hardnessbrittleness of {\alpha}-Al11Nd3 is quantitatively evaluated, accounting for its difficulties of plastic deformation and fragmentation. Combining band structure, population analysis, topological analysis and crystal orbital Hamilton population, it is revealed that {\alpha}-Al11Nd3 possesses two types of chemical bonds: the Nd-Al and Al-Al bonds. The former is a typical ionic bond with electron transfer from Nd to Al, while the latter, dominated by both 3s-3p and 3p-3p interactions, is a weak covalent bond. The mixed chemical bond is responsible for the high hardness-brittleness of {\alpha}-Al11Nd3. This work is expected to lay a foundation for Al-Nd alloy and catalyze the fabrication of high-quality Al-Nd target materials.

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Xue-Qian Wang, Run-Xin Song, Xu Guan, Shuan Li, Shuchen Sun, Hongbo Yang, Daogao Wu, Ganfeng Tu, Song Li, Hai-Le Yan, Liang Zuo. 2024-04-28. Deformability, inherent mechanical properties and chemical bonding of Al11Nd3 in Al-Nd target material. https://arxiv.org/abs/2404.18050

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