Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate
1
Key Lab for Robot & Welding Automation of Jiangxi Province, Mechanical & Electrical Engineering School, Nanchang University, Nanchang 330031, China
2
The Engineering Training Center of Nanchang University, Mechanical & Electrical Engineering School, Nanchang University, Nanchang 330031, China
3
Department of Materials Science and Engineering, and Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials, Southern University of Science and Technology, Shenzhen 518055, China
4
Center for Advanced Life Cycle Engineering (CALCE), University of Maryland, College Park, MD 20742, USA
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(20), 4666; https://doi.org/10.3390/ma13204666
Received: 1 October 2020
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Revised: 13 October 2020
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Accepted: 14 October 2020
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Published: 20 October 2020
(This article belongs to the Special Issue Dynamic Behaviour of Metallic Materials)
The wetting kinetics of nickel-based filler metal (BNi2) over selective laser-melted Ti-6Al-4V (SLMed TC4) titanium alloy in a protective argon atmosphere is experimentally investigated using a real-time in situ hot stage equipped with an optical microscope. The spreading processes at different temperatures are similar, and the overall wetting/spreading process can be roughly divided into three stages: (i) an initial stage, (ii) a rapid spreading stage, and (iii) an asymptotic stage. Moreover, the wetting kinetics of the BNi2/SLMed TC4 system can be expressed by empirical power exponential function Rn~t with n = ~1. In the process of spreading, Ti-based solid solution (Ti(ss)) and intermetallic compound (Ti2Ni and TiB2) were formed at the interface within the reaction domain, and the phase transition of α’ martensitic to α-Ti and β-Ti also took place. The influence of elevated temperature on the spreading and wetting kinetics of the BNi2/SLMed TC4 system was studied, and the results show that the increase of temperature has a slightly promoting effect on the spreading, but a limited impact on the value of n. In addition, the spreading and wetting kinetics of BNi2/SLMed TC4 system are similar to those of BNi2 on conventional forged TC4 substrate.
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Keywords:
wetting kinetics; selective laser melting; BNi2; SLMed TC4; in situ observation
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MDPI and ACS Style
Liu, J.; Liu, G.; Ouyang, H.; Li, Y.; Yan, M.; Pecht, M. Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate. Materials 2020, 13, 4666. https://doi.org/10.3390/ma13204666
AMA Style
Liu J, Liu G, Ouyang H, Li Y, Yan M, Pecht M. Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate. Materials. 2020; 13(20):4666. https://doi.org/10.3390/ma13204666
Chicago/Turabian StyleLiu, Jiankun, Guanpeng Liu, Hua Ouyang, Yulong Li, Ming Yan, and Michael Pecht. 2020. "Wetting Kinetics and Microstructure Analysis of BNi2 Filler Metal over Selective Laser Melted Ti-6Al-4V Substrate" Materials 13, no. 20: 4666. https://doi.org/10.3390/ma13204666
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