摘要
通过真空激光熔覆制备了AlCoCrCu0.5FeMoNiTi高熵合金涂层。用电阻炉对涂层进行500～900℃的退火处理。使用X射线衍射仪、扫描电子显微镜、显微硬度计对涂层的组织结构和硬度进行了分析。结果表明,涂层为BCC结构,晶格常数a为0.291 nm。涂层经过抛光和王水腐蚀后,形貌为树枝晶特征,结晶细密。合金在500～900℃退火处理后仍保持BCC结构,未见有其他析出相,说明合金的具有很好的热稳定性。熔覆态合金的硬度达到1080 HV。经500℃退火后,涂层硬度下降了100 HV,但再升高退火温度,硬度变化极小,在900℃退火后,硬度仍然达到943 HV,说明AlCoCrCu0.5FeMoNiTi高熵合金涂层具有很好的抗高温软化性能。
AlCoCrCu1/2FeMoNiTi high-entropy alloy coating was prepared by using laser under the protection of argon. The coatings were annealed in a resistence furnace at 500 -900 ℃. X-ray diffractometer, scanning electron microscope and microhardness tester were employed to analyze microstructure and hardness. The result shows that the coating is of BCC structure. The lattice constant is 0. 291nm. After polishing and chloroazotic acid corroding, the coating has a dendrite characteristic. The dendrite is fine and dense. After annealing at 500℃ ～ 900℃ , the coatings keep BCC structure, no new phase forming. It is clear that the coating has a good heat-stability. The hardness of Laser Cladding coating is 1080HV. After annealing at 500℃, hardness value decreases by 100HV. However, annealing at higher temperature nearly does not affect the hardness change. Hardness is 943HV after annealing at 900℃, indicating AlCoCrCu1/2FeMoNiTi high-entropy alloy coating has a good resistance to high temperature softening.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2016年第4期268-271,共4页
Powder Metallurgy Technology
基金
广东省自然科学基金(2014A030313784)
广东省科技计划项目(2012B010200047)
江门市科技计划项目(2014~2016)
关键词
激光熔覆
高熵合金
硬度
抗高温软化
Laser Cladding
High-entropy alloy
Hardness
Resistance to high temperature softening
