Strength and elastic modulus enhancement in Mg-Li-Al matrix composites reinforced by ex situ TiB2 particles via stir casting

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Magnesium and Alloys Pub Date : 2024-09-01 DOI:10.1016/j.jma.2022.09.020

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Abstract

A novel Mg-10Li-3Al (wt.%, LA103) matrix composite reinforced by ex situ micron TiB₂ particles was developed in the present study. The ball milling and cold pressing pretreatment of the reinforcements made it feasible to prepare this material under stir casting conditions with good dispersion. The microstructure and mechanical properties of the composites prepared by different pretreatment methods were analyzed in detail. The TiB₂ particles in the Al-TiB₂/LA103 composite using the pretreatment process were uniformly distributed in the microstructure due to the formation of highly wettable core-shell units in the melt. Compared with the matrix alloys, the Al-TiB₂/LA103 composite exhibited effective strength and elastic modulus improvements while maintaining acceptable elongation. The strengthening effect in the composites was mainly attributed to the strong grain refining effect of TiB₂. This work shows a balance of high specific modulus (36.1 GPa·cm³·g^-1) and elongation (8.4%) with the conventional stir casting path, which is of considerable application value.

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非原位TiB2颗粒搅拌铸造增强Mg-Li-Al基复合材料的强度和弹性模量

本研究开发了一种新型 Mg-10Li-3Al（重量百分比，LA103）基复合材料，该材料由原位微米 TiB2 粒子增强。通过对增强材料进行球磨和冷压预处理，可以在搅拌铸造条件下制备出这种分散性良好的材料。研究人员详细分析了不同预处理方法制备的复合材料的微观结构和力学性能。采用预处理工艺制备的 Al-TiB2/LA103 复合材料中的 TiB2 颗粒在微观结构中均匀分布，这是因为熔体中形成了高润湿性的核壳单元。与基体合金相比，Al-TiB2/LA103 复合材料在保持可接受的伸长率的同时，有效提高了强度和弹性模量。复合材料的增强效果主要归功于 TiB2 强大的晶粒细化效应。这项工作表明，在传统搅拌铸造路径下，高比模量（36.1 GPa-cm3-g-1）和伸长率（8.4%）达到了平衡，具有相当大的应用价值。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.