PDF(Pubmed)
Abstract：
The application of 2024 aluminum alloy (comprising aluminum, copper, and magnesium) in the aerospace industry is extensive, particularly in the manufacture of seats. However, this alloy faces challenges during laser powder bed fusion (PBF-LB/M) processing, which often leads to solidification and cracking issues. To address these challenges, LaB6 nanoparticles have been investigated as potential grain refiners. This study systematically examined the impact of adding different amounts of LaB6 nanoparticles (ranging from 0.0 to 1.0 wt.%) on the microstructure, phase composition, grain size, and mechanical properties of the composite material. The results demonstrate that the addition of 0.5 wt.% LaB6 significantly reduces the average grain size from 10.3 μm to 9 μm, leading to a significant grain refinement effect. Furthermore, the tensile strength and fracture strain of the LaB6-modified A2024 alloy reach 251 ± 2 MPa and 1.58 ± 0.12%, respectively. These findings indicate that the addition of appropriate amounts of LaB6 nanoparticles can effectively refine the grains of 2024 aluminum alloy, thereby enhancing its mechanical properties. This discovery provides important support for the broader application of 2024 aluminum alloy in the aerospace industry and other high-performance fields.
摘要：
2024铝合金的应用（包括铝，铜，和镁)在航空航天工业中的应用非常广泛，特别是在座椅的制造中。然而,这种合金在激光粉末床熔合（PBF-LB/M）加工过程中面临挑战，这通常会导致凝固和开裂问题。为了应对这些挑战，LaB6纳米粒子已被研究为潜在的晶粒细化剂。这项研究系统地检查了添加不同量的LaB6纳米颗粒（范围从0.0到1.0wt。%)对微观结构，相组成,晶粒尺寸,复合材料的力学性能。结果表明,添加0.5wt.％LaB6将平均晶粒尺寸从10.3μm降低到9μm，导致显著的晶粒细化效果。此外，LaB6改性A2024合金的抗拉强度和断裂应变达到251±2MPa和1.58±0.12%，分别。结果表明,适量的LaB6纳米粒子的加入可以有效地细化2024铝合金的晶粒,从而提高其机械性能。这一发现为2024铝合金在航空航天等高性能领域的广泛应用提供了重要支撑。
