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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >In-situ Si-p/A380 alloy nano micro composite formation through cold spray additive manufacturing and subsequent hot rolling treatment: Microstructure and mechanical properties
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In-situ Si-p/A380 alloy nano micro composite formation through cold spray additive manufacturing and subsequent hot rolling treatment: Microstructure and mechanical properties

机译：原位Si-P / A380合金纳米微型复合材料通过冷藏添加剂制造和随后的热轧处理：微观结构和机械性能

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摘要

Cold gas dynamic spray (cold spraying, CS) has emerged as a promising solid state manufacturing technique to fabricate thick metallic deposits with limited risk of oxidation, phase transformations and residual thermal stresses. As-sprayed deposits usually exhibit poor mechanical properties and often require post-spray heat treatments to reduce inter-splat defects. In most of the cases, traditional heat treatments offer limited benefits to rejuvenate the mechanical properties of the deposit. This preliminary work presents an effective way to modify the microstructure and improve the mechanical properties of cold sprayed A380 aluminum alloy. As-sprayed alloy deposits were subjected to hot rolling treatments with different thickness reductions. Results suggest that the hot rolled samples show better strength and ductility compared with their as-sprayed state. Microstructural evolution and resulting mechanical properties, at different processing conditions, were analyzed through optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), high resolution transmission electron microscopy (HRTEM) and tensile tests. Sample with thickness reduction of 40% displayed highest values of ultimate strength (UTS, 420 +/- 2.1 MPa) and elongation (Elf, 5 +/- 2.3%) compared with the corresponding values of as-sprayed (100 +/- 13.4 MPa, 0%) and conventionally heat treated (186 +/- 17 MPa, 0.93 +/- 0.05%) samples. The improvement in mechanical properties of the rolled samples were mainly attributed to the progressive elimination/reduction of inter-splat defects together with in-situ composite microstructure formation. EBSD and HRTEM revealed that in-situ composite structure was formed through progressive refinement and uniform distribution of Si particles in alpha-Al matrix containing coherent theta' precipitates. (C) 2018 Elsevier B.V. All rights reserved.
机译：冷气体动态喷涂（冷喷涂，CS）已成为一个有前途的固态制造技术来制造厚的金属沉积物与氧化的风险有限，相变和残留的热应力。作为喷涂沉积物通常显示差的机械性能，并且常常需要喷雾后热处理，以减少帧间图示的缺陷。在大多数情况下，传统的热处理提供的好处有限振兴存款的机械性能。这一初步工作提出修改微观结构和提高冷的机械性能喷涂A380铝合金的有效方法。作为喷涂合金沉积物进行不同厚度的减少热轧处理。结果表明，热轧样品与其作为喷涂状态相比表现出更好的强度和延展性。组织演变和所得的机械性能，在不同的处理条件，是通过光学显微镜（OM）分析，扫描电子显微镜（SEM），电子背散射衍射（EBSD），高分辨率的透射电子显微镜检查（HRTEM）和拉伸。与作为喷涂（100 +/- 13.4对应的值进行比较样品与厚度减少40％显示的极限强度最高值（UTS，420 +/- 2.1兆帕）和伸长率（ELF，5±2.3％）兆帕，0％）和常规热处理（186 +/- 17兆帕，0.93 +/- 0.05％）的样品。在轧制样品的机械性能的改进与原位复合组织的形成主要归因于逐步消除/​​还原图示间缺陷在一起。 EBSD和HRTEM揭示原位复合结构通过渐进细化和的α-Al基体中含有相干THETA”析出物的Si颗粒的均匀分布而形成。 （c）2018年elestvier b.v.保留所有权利。

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