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首页> 外文期刊>Journal of Materials Engineering and Performance >Investigation on the Effect of Reinforcement Particle Size on the Mechanical Properties of the Cold Sprayed Ni-Ni_3Al Composites
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Investigation on the Effect of Reinforcement Particle Size on the Mechanical Properties of the Cold Sprayed Ni-Ni_3Al Composites

机译：增强粒径对冷喷涂Ni-Ni_3Al复合材料力学性能的影响研究

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摘要

In the present study, cold spraying technique was used to fabricate a metal matrix composite (MMC) that consists of Ni matrix and 20 vol.% Ni_3Al particles at two different particle sizes as reinforcement. This study intends to investigate the effect of reinforcement particle size on microstructural and mechanical properties of cold sprayed MMCs. Two different Ni_3Al powders with nominal particle size of -45 to +5 and +45 to 100 μm were used as reinforcement in this study. Cold sprayed Ni-Ni_3Al samples were subjected to the microstructural observation and characterization prior to any mechanical testing. Then, samples were tested using nano-indentation, Knoop hardness, Vickers hardness, and Resonance frequency to evaluate their mechanical properties. No significant changes were observed in microstructural characteristics due to different particle sizes. The results obtained from a variety of mechanical testings indicated that the increasing reinforcement particle size resulted in the slight reduction of mechanical properties such as elastic modulus and hardness in cold sprayed MMCs. The mechanical interlock between deposited particles defines the bonding strength in cold sprayed samples. Small size particles have a higher velocity and impact resulting in stronger interlock between deformed particles.
机译：在本研究中，冷喷涂技术被用于制造金属基复合材料（MMC），该复合材料由Ni基体和20vol％的Ni_3Al颗粒以两种不同的粒径作为增强材料。本研究旨在研究增强颗粒尺寸对冷喷涂MMC的微观结构和力学性能的影响。在这项研究中，使用两种不同的标称粒径为-45至+5和+45至100μm的Ni_3Al粉末作为增强材料。在进行任何机械测试之前，对冷喷涂的Ni-Ni_3Al样品进行微结构观察和表征。然后，使用纳米压痕，努氏硬度，维氏硬度和共振频率测试样品，以评估其机械性能。由于粒径不同，未观察到微观结构特征的显着变化。从各种机械测试获得的结果表明，增强颗粒的尺寸增加导致冷喷涂MMC中机械性能（如弹性模量和硬度）略有降低。沉积颗粒之间的机械互锁定义了冷喷涂样品中的结合强度。小尺寸的颗粒具有较高的速度和冲击力，从而导致变形的颗粒之间更牢固的互锁。

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