Laser Powder Bed Fusion of Ti/Al Layered Composites: Forming Quality, Interface Characteristic and Mechanical Properties

doi:10.3901/JME.2022.17.288

Abstract

Abstract: A Ti/Al layered metal composite (Ti/Al LMC) is fabricated through laser powder bed fusion (LPBF) technology. The forming quality, interface characteristic and mechanical properties of Ti/Al LMC are studied. The results show that the processing parameters of titanium and aluminum layer are 800 mm/s, 200 W; 2 400 mm/s, 350 W, respectively, a lower-porosity (2.73%) sample can be obtained, and the interface between titanium layer and aluminum layer is well bonded, with high microhardness (226.3 HV_0.2) and good wear resistance (The wear rate is 10.4×10^-4 mm³/(Ν∙m)). TiAl₃ intermetallic compounds are found in the samples prepared under different process parameters, which are formed because of the interdiffusion phenomenon at the interface of Ti/Al layered composite structure. TiAl₃ preferentially grew from aluminum layer to titanium layer along the direction of maximum cooling rate. Friction and wear experiments show that good interfacial bonding and an appropriate amount of TiAl₃ intermetallic compounds can improve the wear resistance of Ti/Al LMC, and the wear mechanism is mainly adhesion wear and abrasive wear.

Key words: Ti/Al layered metal composite, interface bonding, intermetallic, element diffusion, mechanical properties

CLC Number:

V261

LI Deli, WANG Rui, ZHANG Han, LIN Kaijie, GU Dongdong. Laser Powder Bed Fusion of Ti/Al Layered Composites: Forming Quality, Interface Characteristic and Mechanical Properties[J]. Journal of Mechanical Engineering, 2022, 58(17): 288-296.

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