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A hybrid approach to improve microstructure and mechanical properties of cold spray additively manufactured A380 aluminum composites

机译：改善冷喷涂添加剂制造的A380铝复合材料的微观结构和力学性能的混合方法

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摘要

This study comprehensively determined the microstructure and mechanical properties of cold spray additively manufactured A380 alloy components. In this regard, three types of Al_2O_3/A380 composite deposits were prepared by separately mixing spherical, irregular, and spherical + irregular shaped Al_2O_3 particulates with the original A380 alloy powder. The as-sprayed deposits were subsequently subjected to heat-treatment at 350 ℃ for 4 h. The effects of Al_2O_3 morphology on the microstructure and mechanical properties of A380 deposits were systematically investigated at different processing stages by electron backscattered diffraction analysis and tensile testing, respectively. Moreover, the evolution of defects (pores and dislocation) inside the deposits was comprehensively studied using X-ray computed tomography and transmission electron microscopy techniques. The results indicated that the deposit containing spherical Al_2O_3 exhibited significantly reduced porosity, grain refinement and a significant increase in strength (～70%) in contrast to the pure A380 alloy deposit. This could be attributed to the tamping effect of the spherical Al_2O_3 particles. In contrast, the irregular Al_2O_3 particles primarily indicated the embedding effect with recurrence of fragmentation events inside the deposit. Consequently, the deposit containing irregular Al_2O_3 indicated only a slight decrease in porosity and a ～40% increase in strength in contrast to the pure A380 alloy deposit. The tensile test results indicated that heat-treatment significantly improved the plasticity of deposits through fusion of nano-sized pores, reduction in dislocation density and static re-crystallization. Therefore, the hybrid approach of adding a suitable tamping aid to the original A380 alloy powder and post-spray heat-treatment optimized the microstructure of cold spray additively manufactured components to significantly improve their mechanical properties.
机译：这项研究全面确定了冷喷涂添加剂制造的A380合金部件的组织和力学性能。在这方面，通过将球形，不规则形状和球形+不规则形状的Al_2O_3颗粒与原始A380合金粉末分别混合，制备了三种类型的Al_2O_3 / A380复合沉积物。喷涂后的沉积物随后在350℃下进行4 h热处理。通过电子反向散射衍射分析和拉伸试验，分别研究了Al_2O_3形态对A380沉积层组织和力学性能的影响。此外，使用X射线计算机断层扫描和透射电子显微镜技术对沉积物内部缺陷（孔和位错）的演变进行了全面研究。结果表明，与纯A380合金相比，球形Al_2O_3镀层的孔隙率显着降低，晶粒细化，强度显着提高（约70％）。这可能归因于球形Al_2O_3颗粒的夯实作用。相比之下，不规则的Al_2O_3颗粒主要表明了嵌入效应，并再次出现了沉积内部碎裂事件。因此，与纯A380合金沉积物相比，含有不规则Al_2O_3的沉积物的孔隙率仅略有下降，而强度却提高了约40％。拉伸试验结果表明，热处理通过纳米孔的融合，位错密度的降低和静态再结晶而显着提高了沉积物的可塑性。因此，向原始A380合金粉末中添加合适的捣固助剂并进行喷涂后热处理的混合方法优化了冷喷涂添加剂制造的部件的微观结构，从而显着改善了它们的机械性能。

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