Microstructure uniformity of the Al-Nd target materials with Al11 Nd_(3) significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor li...Microstructure uniformity of the Al-Nd target materials with Al11 Nd_(3) significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor liquid crystal display(TFT-LCD)panels.Understanding the inherent mechanical properties and chemical bonds of Al11 Nd_(3) 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 Al11 Nd_(3) were investigated comprehensively.The Al-3wt%Nd alloy is composed of the pre-eutecticα-Al matrix and the eutecticα-Al and a high stableα-Al11 Nd_(3) phase.During the plastic deformation,the eutectic microstructure transforms from a cellular to a lamel-lar shape,while the morphology and dimension ofα-Al11 Nd_(3) are not changed significantly.By examin-ing ideal tensile strength,elastic moduli,hardness and brittleness-ductility,the hardness-brittleness ofα-Al11 Nd_(3) is quantitatively evaluated,accounting for its difficulties of plastic deformation and fragmen-tation.Combining band structure,population analysis,topological analysis and crystal orbital Hamilton population,we found thatα-Al11 Nd_(3) 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 3 s-3 p and 3 p-3 p interactions,is a weak covalent bond.The mixed chemical bond is responsible for the high hardness-brittleness ofα-Al11 Nd_(3).This work is expected to lay a foundation for Al-Nd alloy and catalyze the fabrication of high-quality Al-Nd target materials.展开更多
The Al-Nd-Sb phase diagram over the whole concentration region at 500 ℃ has been determined with the use of powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive analysis. A new...The Al-Nd-Sb phase diagram over the whole concentration region at 500 ℃ has been determined with the use of powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive analysis. A new ternary compound ～Al6Nd28Sb66 (space group Imm2, a=1.5191(1) nm, b=1.9914(2) nm, c=0.4377(1) nm) with La6MnSb15-type has been found.展开更多
基金supported by the National Key R&D Program of China(No.2022YFB3504401).
文摘Microstructure uniformity of the Al-Nd target materials with Al11 Nd_(3) significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor liquid crystal display(TFT-LCD)panels.Understanding the inherent mechanical properties and chemical bonds of Al11 Nd_(3) 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 Al11 Nd_(3) were investigated comprehensively.The Al-3wt%Nd alloy is composed of the pre-eutecticα-Al matrix and the eutecticα-Al and a high stableα-Al11 Nd_(3) phase.During the plastic deformation,the eutectic microstructure transforms from a cellular to a lamel-lar shape,while the morphology and dimension ofα-Al11 Nd_(3) are not changed significantly.By examin-ing ideal tensile strength,elastic moduli,hardness and brittleness-ductility,the hardness-brittleness ofα-Al11 Nd_(3) is quantitatively evaluated,accounting for its difficulties of plastic deformation and fragmen-tation.Combining band structure,population analysis,topological analysis and crystal orbital Hamilton population,we found thatα-Al11 Nd_(3) 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 3 s-3 p and 3 p-3 p interactions,is a weak covalent bond.The mixed chemical bond is responsible for the high hardness-brittleness ofα-Al11 Nd_(3).This work is expected to lay a foundation for Al-Nd alloy and catalyze the fabrication of high-quality Al-Nd target materials.
基金Project supported bythe Natural Science Foundation of Guangxi (0249013)
文摘The Al-Nd-Sb phase diagram over the whole concentration region at 500 ℃ has been determined with the use of powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive analysis. A new ternary compound ～Al6Nd28Sb66 (space group Imm2, a=1.5191(1) nm, b=1.9914(2) nm, c=0.4377(1) nm) with La6MnSb15-type has been found.
