Additive manufacturing enabled synergetic strengthening of bimodal reinforcing particles for aluminum matrix composites
Additive manufacturing enabled synergetic strengthening of bimodal reinforcing particles for aluminum matrix composites
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增材制造实现了铝基复合材料双峰增强颗粒的协同强化
DOI：
10.1016/j.addma.2023.103543
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发表时间：
2023
影响因子：
11
通讯作者：
Ma S
中科院分区：
文献类型：
--
作者：
Ma S
采用激光粉末床熔接（LPBF）制备了添加少量Sc的TiB2/Al-Cu-Mg-Ni复合材料。该复合材料的屈服强度为~ 370 MPa，几乎是其变形基体强度的两倍，伸长率为~ 7%。优异的力学性能归功于其独特的微纳分层结构，由分散在细铝晶粒（3 μ m）基体中的纳米级和微米级tib2颗粒，以及颗粒内金属间纳米颗粒和纳米细胞网络（细胞尺寸为30 nm）组成。tib2纳米颗粒的形成是tib2颗粒部分溶解和Sc在新形成的纳米颗粒中富集的结果。双峰tib2粒子、金属间纳米粒子和颗粒内纳米细胞网络均取得了显著的强化效果。这项研究为增材制造在定制具有先进性能的颗粒增强金属基复合材料（MMCs）的微观结构方面的作用提供了新的见解。
An additive manufactured TiB2/Al-Cu-Mg-Ni composite with a minor amount of Sc was fabricated by laser powder bed fusion (LPBF). The composite shows a yield strength of ∼370 MPa, almost doubling the strength of its wrought matrix counterpart, and an elongation of ∼7 %. The superior mechanical properties are attributed to a unique micro-nano hierarchical microstructure, consisting of nanoscale and microscale TiB2particles dispersed in a matrix of fine aluminum grains (3 µm) together with intragranular intermetallic nanoparticles and nano-cellular networks (cell size 30 nm). The formation of the TiB2nanoparticles is the consequence of partial dissolution of the TiB2particulates and the enrichment of Sc in the newly formed nanoparticles. Remarkable strengthening effects are achieved by the bimodal TiB2particles, intermetallic nanoparticles and intragranular nano-cellular networks. This study provides new insights into the role of additive manufacturing in tailoring the microstructure of particulate reinforced metal matrix composites (MMCs) with advanced properties.