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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Fabrication and microstrain evolution of AI-TiB_2 composite coating by cold spray deposition
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Fabrication and microstrain evolution of AI-TiB_2 composite coating by cold spray deposition

机译：冷喷雾沉积的AI-TIB_2复合涂层的制造和微纹状体

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摘要

This paper investigates the microstructure evolution of Al-TiB2 coatings prepared by cold spraying. In situ Al-TiB2 composite powders containing uniformly distributed titanium diboride (TiB2) particles with a size range of 5-100nm in the Al matrix and Al/Al-TiB2 blended powders were used as the cold spray feedstock for coating fabrication on aluminium alloy substrates. The microstructures of the feedstock powders and as-deposited coatings were characterised using scanning electron microscopy with energy dispersive X-ray analysis and X-ray diffraction. Al/Al-TiB2 blended powder coatings, compromising closely packed powder particles, were sprayed to an approximate thickness of 500 mu m. Al-TiB2 composite coatings (approximately 50 mu m thick) were obtained retaining the microstructure of the composite powders being sprayed and no evidence of detrimental phase transformation was found. However, micro-cracks were found to exist in the Al-TiB2 coating due to the hardly deformable powder particles. Little or no microstrain was revealed in the as-sprayed Al-TiB2 coating, indicating that annealing may have occurred due to the localised adiabatic heating during the spraying process. It is demonstrated that it is possible to fabricate the Al-TiB2 composite coating by cold spray deposition but further improvements to eliminate coating cracking are required.
机译：本文研究了冷喷涂制备的Al-Tib2涂层的微观结构演变。在含有尺寸范围的含有5-100nm的含有均匀分布的钛的二硼（Tib2）颗粒的原位Al-Tib2复合粉末在Al基质和Al / Al-Tib2混合粉末中用作用于在铝合金基板上涂布制造的冷喷雾原料。使用具有能量分散X射线分析和X射线衍射的扫描电子显微镜以及X射线衍射的扫描电子显微镜表征原料粉末和沉积涂层的微观结构。 Al / Al-Tib2混合粉末涂料，损害紧密填充的粉末颗粒，喷洒到近似500μm的厚度。得到Al-Tib2复合涂层（约50μm厚），保留被喷涂的复合粉末的微观结构，没有发现有害相变的证据。然而，由于难以变形的粉末颗粒，发现在Al-Tib2涂层中存在微裂纹。在喷涂的Al-Tib2涂层中揭示了微纹状体很少或没有微观纹状体，表明由于喷涂过程中的局部绝热加热而导致退火。结果证明，可以通过冷喷涂沉积制造Al-Tib2复合涂层，但需要进一步改善以消除涂层裂纹。

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