Microstructure and mechanical properties of a new multi-component Ni3Al alloy formed by laser melting deposition
A new multi-component Ni3Al alloy Ni45Co23Fe9Al11Ti12 was designed and successfully prepared by laser melting deposition(LMD)technology.Microstructure and room temperature mechanical properties of the deposited alloy were studied using X-ray diffraction,scanning electron microscopy and universal testing machine.The results show that the grains of the Ni45Co23Fe9Al11Ti12 alloy prepared by LMD are coarse columnar crystals that grow epitaxially along the deposition direction.The grains are composed of cellular dendrites without lateral branching,and both the internal of the dendrites and interdendritic regions are composed of network FCC matrix and block γ'phase.The size of the γ'phase in the interdendritic region is larger than that in the intragranular region.The Ni45Co23Fe9Al11Ti12 alloy formed by LMD has good room temperature properties,with the yield strength of 879 MPa,the tensile strength of 1160 MPa,and the elongation of 9.5％.Its comprehensive mechanical properties are far superior to similar alloys,and the significant improvement in yield strength may be related to the high-density γ'phase.
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