Microstructure evolution and mechanical properties of selective laser melting fabricated hybrid particle reinforced AlSi10Mg composites

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-22 DOI:10.1016/j.matchar.2024.114483

Xingyao Wang , Qinghua Lu , Peilei Zhang , Hua Yan , Haichuan Shi , Tianzhu Sun

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引用次数: 0

Abstract

(SiC+TiB₂)/AlSi10Mg composite powders with 5 wt% micro-SiC particles and 1.5 wt% nano-TiB₂ particles were prepared by high energy ball milling, and hybrid particle reinforced aluminum matrix composites (AMCs) were fabricated by SLM. This study systematically investigated the effects of SiC and TiB₂ particles on the phase composition, microstructure evolution, grain crystallization, and mechanical properties. The machanisms of potential strengthening and fracture mechanisms were revealed. The tribological behaviors of the hybrid particle reinforced AlSi10Mg composites under different friction conditions were explored as well. The results show that the 1.5 wt% nano-TiB₂ particles provided sufficient nucleation sites for grain growth, completely transforming from coarse columnar to fined equiaxed grains. The average grain size decreases from 7.98 μm to 3.34 μm, and the texture is significantly weakened, which is beneficial to the homogenization of the microstructure, thereby improving the mechanical properties of the SiC/AlSi10Mg composites. The (SiC+TiB₂)/AlSi10Mg composites showed a high ultimate tensile strength (∼ 489.1 MP), hardness (172.2 HV) and elongation of 8.2 %. The enhancement of mechanical properties was attributed to Orowan strengthening, fine grain strengthening, and load-bearing strengthening. Due to the Si precipitates and fine microstructure, a low wear rate of 0.50 × 10⁻⁵ g/m was obtained, 10.7 % lower than that of SLM formed SiC/AlSi10Mg composites. The friction process is affected by abrasive wear, adhesive wear and delamination wear. It is aspired that the current approach can provide guidance for the design of new alloy systems with excellent performance.

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选择性激光熔融混合颗粒增强 AlSi10Mg 复合材料的微观结构演变和力学性能

(采用高能球磨法制备了含有 5 wt% 微 SiC 颗粒和 1.5 wt% 纳米 TiB2 颗粒的（SiC+TiB2）/AlSi10Mg 复合粉末，并采用 SLM 法制造了混合颗粒增强铝基复合材料（AMC）。该研究系统地考察了 SiC 和 TiB2 粒子对相组成、微结构演变、晶粒结晶和力学性能的影响。揭示了潜在的强化和断裂机制。此外，还探讨了混合颗粒增强的 AlSi10Mg 复合材料在不同摩擦条件下的摩擦学行为。结果表明，1.5 wt% 的纳米钛白粉颗粒为晶粒生长提供了足够的成核位点，使粗柱状晶粒完全转变为细小的等轴晶粒。平均晶粒尺寸从 7.98 μm 减小到 3.34 μm，纹理明显减弱，这有利于微观结构的均匀化，从而改善 SiC/AlSi10Mg 复合材料的力学性能。(SiC+TiB2)/AlSi10Mg 复合材料显示出较高的极限拉伸强度（489.1 MP）、硬度（172.2 HV）和 8.2 % 的伸长率。机械性能的提高归因于奥罗旺强化、细晶粒强化和承载强化。由于硅析出物和精细的微观结构，获得了 0.50 × 10-5 g/m 的低磨损率，比 SLM 形成的 SiC/AlSi10Mg 复合材料的磨损率低 10.7%。摩擦过程受到磨料磨损、粘着磨损和分层磨损的影响。希望目前的方法能为设计性能优异的新型合金系统提供指导。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.