Effects of ceramic material in laser-directed energy deposition of titanium/ceramic functionally graded materials
参考中译:陶瓷材料在激光诱导沉积钛/陶瓷功能梯度材料中的作用


          

刊名：Journal of Materials Processing Technology
作者：Zheng W.（School of Mechanical Engineering Guizhou University）
Zhang D.（School of Mechanical Engineering Guizhou University）
Wu D.（Joining and Welding Research Institute (JWRI) Osaka University）
Ma N.（Joining and Welding Research Institute (JWRI) Osaka University）
Geng P.（Joining and Welding Research Institute (JWRI) Osaka University）
刊号：770LD053
ISSN：0924-0136
出版年：2023
年卷期：2023, vol.317
页码：117992
总页数：9
分类号：TG50; TB3
关键词：Ceramic material；Functionally graded material；Laser-directed energy deposition；Orowan strengthening effect；Titanium alloy
参考中译：陶瓷材料;梯度功能材料;激光能量沉积; Orowan强化效应;钛合金
语种：eng
文摘：The titanium/ceramic functionally graded materials (FGMs) have much higher wear resistance than traditional titanium alloys, while cracks are easily formed during the manufacturing process. The zirconia-toughened alumina (ZTA) was adopted to suppress the crack and improve the performances in the laser-directed energy deposition (L-DED) of TC4/ZTA FGMs. The mechanisms influencing the microstructure, hardness, and friction wear properties of the ZTA were investigated. The interfacial reactions and solid-state phase transformation during the L-DED process formed TiAl2O5 compounds and nanoscale yttria-stabilized tetragonal zirconia (YSZ) particles in the ZTA-deposited layer, where the β and lamellar martensitic secondary α' phases were increased by Zr. The nano-YSZ particles refined the grains in the ZTA-deposited layer by promoting heterogeneous nucleation and inhibiting grain growth, thereby causing a columnar-to-equiaxed transition. The hardness and friction wear properties increased with an increasing ZTA concentration, which is caused by the fine grain and Orowan strengthening effects of the nano-YSZ particles. Additionally, the better ductility and lower mismatch in the coefficient of thermal expansion of ZTA compared with Al2O3 ceramic were beneficial for crack suppression.
参考中译：钛/陶瓷功能梯度材料比传统的钛合金具有更高的耐磨性，但在制造过程中容易产生裂纹。在TC4/ZTA功能梯度材料的激光定向能沉积过程中，采用氧化锆增韧氧化铝抑制裂纹，改善材料的性能。研究了影响ZTA组织、硬度和摩擦磨损性能的机理。在L固相沉积过程中，界面反应和固相转变在沉积层中形成了TiAl2O5化合物和纳米级的Y稳定的四方氧化锆颗粒，其中β和片状马氏体二次α‘’相被增加。纳米YSZ颗粒通过促进异质形核和抑制晶粒长大细化了ZTA沉积层中的晶粒，从而导致了柱状晶向等轴晶的转变。硬度和摩擦磨损性能随着ZTA含量的增加而提高，这是由于纳米YSZ颗粒的细晶和奥罗旺强化作用所致。此外，与Al_2O_3陶瓷相比，ZTA陶瓷具有更好的延展性和较低的热膨胀系数失配，有利于裂纹的抑制。



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