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《Applied Laser》 2015-05
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Microstructure and Tribological Properties of Ti_5Si_3/Al_3Ni_2 Reinforced Al_3Ti/NiTi Matrix Composite Coatings in Situ Synthesized by Laser Cladding

Yu Pengcheng;Liu Xiubo;Lu Xiaolong;Qiao Shijie;Zhai Yongjie;Chen Yao;Shi Gaolian;Wu Shaohua;School of Mechanical & Electric Engineering,Soochow University;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences;Suzhou Institute of Industrial Technology;  
The composite powders of Ni80Cr20-Al-Si were prepared on Ti6Al4 Valloy substrate by laser cladding.The microstructure,micro-hardness and tribological properties of the different constituent of composite coatings were investigated using X-ray diffraction(XRD),scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS),moreover,the wear mechanism of the Ti6Al4 Valloy specimen and laser clad coatings were analyzed.The results shown that the laser clad coating shave metallurgical bonding withTi6Al4 Vsubstrate.Due to in situ formation of high hardness of Ti5Si3/Al3Ni2 reinforcing phase,the average hardness of laser clad coating is approximately 2.5to 3times that of Ti6Al4Valloy(350HV0.5).The mass fraction of coating N2(Ni80Cr20-40Al-20 Si,wt%)possess better wear resistance is approximately twice than Ti6Al4 Valloy.However,the mass fraction of coatingN1(Ni80Cr20-40Al-10 Si,wt%)exhibits poorer wear resistance that of Ti6Al4 Valloy due to a large number of volume fractionAl3Ni2.Thewear mechanism of Ti6Al4 Valloy is severe adhesive wear and abrasive wear.While the laser clad coating is mainly brittle fracture and adhesive wear.
【Fund】: 江苏省自然科学基金资助项目(项目编号:BK20141194 BK20131155);; 江苏省高端结构材料重点实验室开放基金资助项目(项目编号:hsm1401)
【CateGory Index】: TG174.4
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