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Title: Microstructural evolvement and formation of selective laser melting W–Ni–Cu composite powder
Authors: Zhang, Danqing
Cai, Qizhou
Liu, Jinhui
He, Jian
Li, Ruidi
Issue Date: 2012
Source: Zhang, D., Cai, Q., Liu, J., He, J., & Li, R. (2012). Microstructural evolvement and formation of selective laser melting W–Ni–Cu composite powder. The International Journal of Advanced Manufacturing Technology, 67(9-12), 2233-2242.
Series/Report no.: The international journal of advanced manufacturing technology
Abstract: W–Ni–Cu alloy (90 wt% W, 7.5 wt% Ni, and 2.5 wt% Cu) parts were successfully fabricated via selective laser melting method. Phases, microstructure, compositions, and laser forming parameters of laser melted samples were investigated. It was found that the W–Ni–Cu powder system was based on the mechanism of liquid solidification. This process was realized through full melting of W, Ni, and Cu particles under high laser energy input. However, using relatively lower energy input, particle bonding was realized through liquid phase sintering with complete melting of Ni–Cu acting as binder and nonmelting of W acting as structure. Due to the Ni–Cu solid solution phase that appeared in a wide range from 1,084 to 1,455 °C, a coherent matrix interface can be observed after solidification. The microhardness of laser-fabricated specimens varied with different powder layer thicknesses, resulting from the laser-treated condition and ability of trapped air in the loose powder bed to escape. The metallurgical mechanisms were also addressed.
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