Hierarchical MgAl2O4/Al3Ti nucleating agents induce full equiaxed grains in laser-powder-bed-fused Al alloys

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Zhendong Jia , Qiaonan Shu , Biao Chen , Fangqi Liu , Lei Jia , Pingxiang Zhang , Jinshan Li
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引用次数: 0

Abstract

Laser powder bed fusion (LPBF) provides high design freedom for high-strength aluminum alloys in aerospace and automotive industries. However, the rapid solidification of LPBF results in a critical microstructural challenge in aluminum alloys: coarse columnar grains with anisotropy and cracking. In this work, we employ the synergistic effect of magnesium and titanium elements in aluminum alloys for building self-assembled MgAl2O4/Al3Ti hierarchical architectures as a highly efficient nucleation agent. In-situ MgAl2O4 nanoparticles offer coherent interfaces (lattice mismatch: 0.05 %) for the nucleation of L12-structured Al3Ti phase, facilitating the formation of fully equiaxed grains with random orientations in aluminum alloys. Aberration-corrected transmission electron microscopy demonstrates atomic-scale coherence at MgAl2O4/Al3Ti interfaces, confirming MgAl2O4 as effective nucleation substrates for Al3Ti phase. Our study provides a new microstructure-design strategy for LPBF, achieving aluminum alloys with fully equiaxed grains.
分层形核剂MgAl2O4/Al3Ti在激光粉末床熔合铝合金中诱导出全等轴晶粒
激光粉末床熔合(LPBF)为航空航天和汽车工业中的高强度铝合金提供了很高的设计自由度。然而,LPBF的快速凝固给铝合金带来了一个关键的微观组织挑战:具有各向异性和裂纹的粗柱状晶粒。在这项工作中,我们利用铝合金中镁和钛元素的协同效应,作为一种高效的成核剂,构建了自组装的MgAl2O4/Al3Ti分层结构。原位MgAl2O4纳米颗粒为l12结构Al3Ti相的形核提供了相干界面(晶格错配:0.05%),促进了铝合金中随机取向的完全等轴晶粒的形成。像差校正透射电镜显示MgAl2O4/Al3Ti界面的原子尺度相干性,证实MgAl2O4是Al3Ti相的有效成核底物。我们的研究为LPBF提供了一种新的组织设计策略,使铝合金具有完全等轴晶。
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来源期刊
Scripta Materialia
Scripta Materialia 工程技术-材料科学:综合
CiteScore
11.40
自引率
5.00%
发文量
581
审稿时长
34 days
期刊介绍: Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.
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