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Influence of yttrium on microstructure and properties of Ni—Al alloy coatings prepared by laser cladding 被引量:4

Influence of yttrium on microstructure and properties of Ni—Al alloy coatings prepared by laser cladding
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摘要 NieAl alloy coatings with different Y additions are prepared on 45#medium steel by laser cladding. The influence of Y contents on the microstructure and properties of NieAl alloy coatings is investigated using X-ray diffraction, scanning electron microscopy, electron probe microanalyzer, Vickers hardness tester, friction wear testing machine, and thermal analyzer. The results show that the cladding layers are mainly composed of NiAl dendrites, and the dendrites are gradually refined with the increase in Y additions. The purification effect of Y can effectively prevent Al2O3oxide from forming. However, when the atomic percent of Y addition exceeds 1.5%, the extra Y addition will react with O to form Y2O3oxide, even to form Al5Y3O12oxide, depending on the amount of Y added. The Y addition in a range of 1.5e3.5 at.% reduces the hardness and anti-attrition of cladding layer, but improves obviously its wear and oxidation resistances. Ni-A1 alloy coatings with different Y additions are prepared on 45# medium steel by laser cladding. The influence of Y contents on the microstructure and properties of Ni-A1 alloy coatings is investigated using X-ray diffraction, scanning electron microscopy, electron probe microanalyzer, Vickers hardness tester, friction wear testing machine, and thermal analyzer. The results show that the cladding layers are mainly composed of NiA1 dendrites, and the dendrites are gradually refined with the increase in Y additions. The purification effect of Y can effectively prevent A1203 oxide from forming. However, when the atomic percent of Y addition exceeds 1.5%, the extra Y addition will react with O to form Y203 oxide, even to form A15Y3012 oxide, depending on the amount of Y added. The Y addition in a range of 1.5-3.5 at.% reduces the hardness and anti-attrition of cladding layer, but improves obviously its wear and oxidation resistances.
作者 Cun-shan WANG
出处 《Defence Technology(防务技术)》 SCIE EI CAS 2014年第1期22-27,共6页 Defence Technology
关键词 NI-AL 组织和性能 合金涂层 激光熔覆 微观结构 摩擦磨损试验机 X射线衍射 显微分析仪 Laser cladding Ni-A1 alloy Yttrium Microstructure Property
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