Microstructure, Mechanical Properties and Tribological Behavior of Wire Electron Beam Additive Manufactured Eutectic Al–12Si Alloy

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-08-26 DOI:10.1007/s12540-024-01785-8

Sergei Tarasov, Ruslan Balokhonov, Veronika Utyaganova, Anna Zykova, Nikolai Savchenko, Andrey Vorontsov, Varvara Romanova, Nikolai Shamarin, Evgeny Knyazhev, Denis Gurianov, Evgeny Moskvichev

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Abstract

Wire electron beam additive manufacturing has been used to build a wall from Al–12Si wire on an AA5056 substrate. The microstructures composed of aluminum dendrites and Al/Si eutectics have been revealed along with heat-affected bands where silicon crystals coarsened by reheating from deposition of the next layer. Fine precipitates were detected in the aluminum grains subjected to reheating. Twinning of silicon particles was found by means of TEM, which was the result of the thermal expansion mismatch stresses that appeared in cooling to the room temperatures as shown by direct FEM numerical simulations. Ultimate tensile strength (UTS) and yield stress (YS) ranged from 178–185 MPa and 104–115 MPa, respectively, as compared to 84 and 142 MPa for the as-cast alloy. Minimal wear was obtained on samples cut from the middle part of the wall. Wire additive manufacturing allowed obtaining the Al–12Si structures with equiaxed eutectic Si crystals that allowed improving tensile and compression strengths as well as wear resistance as compared to those of the as-cast alloy.

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线材电子束添加剂制造的共晶 Al-12Si 合金的微观结构、力学性能和摩擦学行为

利用线电子束增材制造技术，在 AA5056 基材上用 Al-12Si 线制造了一堵墙。由铝枝晶和铝/硅共晶组成的微观结构以及受热影响的带状结构被揭示出来，在这些带状结构中，硅晶体在下一层沉积后重新加热而变粗。在重新加热的铝晶粒中发现了细小的沉淀物。通过 TEM 发现了硅颗粒的孪晶，正如直接有限元数值模拟所示，这是冷却到室温时出现的热膨胀失配应力的结果。极限拉伸强度（UTS）和屈服应力（YS）分别为 178-185 兆帕和 104-115 兆帕，而铸造合金的极限拉伸强度和屈服应力分别为 84 和 142 兆帕。从壁中间部分切割的样品磨损最小。线材添加剂制造技术可获得具有等轴共晶硅晶体的 Al-12Si 结构，与铸造合金相比，可提高拉伸和压缩强度以及耐磨性。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.