Design of Al-2.5Fe-2Mn alloy for both high-temperature strength and sufficient processability of laser powder bed fusion
Design of Al-2.5Fe-2Mn alloy for both high-temperature strength and sufficient processability of laser powder bed fusion
复制标题
兼具高温强度和足够的激光粉末床熔合加工性能的 Al-2.5Fe-2Mn 合金的设计
DOI：
10.1016/j.addma.2023.103524
复制
发表时间：
2023
影响因子：
11
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Wang;W.;Takata;N.;Suzuki;A.;Kobashi;M.;Kato;M.
本文提出了一种具有α-Al/Al6M （M = Fe, Mn）细化两相组织的Al - Fe - Mn三元合金的设计理念，该合金具有足够的激光粉末床熔合加工性能和高温力学性能。基于非平衡液相投影热力学计算，设计了Al-2.5Fe-2Mn（质量%）的近共晶（液相→α-Al(fcc) + Al6M）组成，以避免形成粗糙的初生金属间化合物（对PBF致密化的加工性能有不利影响）。所设计的Al-2.5Fe-2Mn合金粉末具有足够的l - pbf可加工性，成功制备了相对密度在99%以上的完全致密的厘米级样品。el - pbf Al-2.5Fe-2Mn合金样品在熔池区域表现出由Al6M和α-Al相组成的明显细化的凝固组织。Fe和Mn合金元素有助于α-Al基体中形成纳米级al6m相颗粒和高固溶体浓度。在高温下，el - pbf Al-2.5Fe-2Mn合金的强度略有降低，但在300℃高温下仍保持在240 MPa以上。这种优异的高温力学性能是由于细化的α-Al/Al6M两相组织具有较高的热稳定性和纳米Al6M相析出相的形成。
This paper presents a novel design concept for Al alloys with both sufficient laser powder bed fusion (L-PBF) processability and high-temperature mechanical performance using an Al–Fe–Mn ternary alloy with a refined α-Al/Al6M (M = Fe, Mn) two-phase microstructure. The near-eutectic (liquid → α-Al(fcc) + Al6M) composition of Al–2.5Fe–2Mn (mass%) was designed to avoid the formation of coarse primary intermetallics (having a detrimental effect on the PBF processability for densification) based on non-equilibrium liquidus projection thermodynamic calculations. The designed Al–2.5Fe–2Mn alloy powder exhibited sufficientL-PBF processability, and fully dense centimeter-sized samples (relative densities of above 99%) were successfully prepared. TheL-PBF Al–2.5Fe–2Mn alloy samples exhibited a significantly refined solidification microstructure consisting of Al6M and α-Al phases in the melt-pool regions. Fe and Mn alloying elements contributed to the formation of nanoscale Al6M-phase particles and a high solid solution concentration in the α-Al matrix. The strength of theL-PBF Al–2.5Fe–2Mn alloy was slightly reduced at higher temperatures, but remained above 240 MPa at an elevated temperature of 300 °C. This superior high-temperature mechanical performance was attributed to the high thermal stability of the refined α-Al/Al6M two-phase microstructure and the formation of nanosized Al6M-phase precipitates.