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Effect of volumetric energy density on microstructure and tribological properties of FeCoNiCuAl high-entropy alloy produced by laser powder bed fusion
Virtual and Physical Prototyping ( IF 10.2 ) Pub Date : 2020-12-07
Yaojia Ren, Luxin Liang, Quan Shan, Anhui Cai, Jingguang Du, Qianli Huang, Shifeng Liu, Xin Yang, Yingtao Tian, Hong Wu

ABSTRACT

A near-equiatomic FeCoNiCuAl High-entropy alloy (HEA) was produced using laser powder bed fusion (L-PBF) pre-alloy powder. Microstructural characteristics and tribological properties of L-PBF specimens under various volumetric energy densities (VEDs) were investigated in detail. The results showed that the phase of L-PBF specimen consisted of BCC matrix + Cu-rich B2 precipitate. The microstructure of L-PBF specimen largely consisted of columnar grains perpendicular to the melt pool boundary (MPB) direction owing to the epitaxial growth along the temperature gradient. The preferred orientation of the L-PBF specimen was gradually transformed from the order of <001> to <101> as the VED rose. Larger size precipitates re-appeared and wider MPB were formed upon faster remelting and steeper cooling as a result of higher VED. Compared to the components produced by Spark Plasma Sintering, L-PBF specimens presented better wear resistance owing to the ultra-fine substructure and nano-scaled precipitates. In addition, the L-PBF specimen produced with 83 J/mm3 VED exhibits the highest elastic strain to failure (H/Er ) and yield stress (H 2/E r 3).



中文翻译:

体积能量密度对激光粉末床熔炼FeCoNiCuAl高熵合金组织和摩擦学性能的影响

摘要

使用激光粉末床熔合(L-PBF)预合金粉末生产了近等原子的FeCoNiCuAl高熵合金(HEA)。详细研究了L-PBF样品在各种体积能量密度(VED)下的微观结构特征和摩擦学性能。结果表明,L-PBF试样的相由BCC基质+富Cu的B2沉淀组成。由于沿温度梯度的外延生长,L-PBF试样的微观结构主要由垂直于熔池边界(MPB)方向的柱状晶粒组成。L-PBF标本的首选方向逐渐从<001>变为<101>,作为VED玫瑰。由于较高的VED,在更快的重熔和更陡峭的冷却下,会再次出现更大尺寸的沉淀物并形成更宽的MPB 。与火花等离子烧结生产的组件相比,L-PBF样品由于具有超细的亚结构和纳米级析出物而具有更好的耐磨性。此外,以83 J / mm 3 VED制成的L-PBF样品表现出最高的断裂弹性应变(H / E r )和屈服应力(H 2 / E r 3)。

更新日期:2020-12-08
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