[4] BOBBIO L D, OTIS R A, BORGONIA J P, et al. Additive manufacturing of a functionally graded material from Ti-6Al-4V to Invar: experimental characterization and thermodynamic calculations［J］. Acta Materialia, 2017, 127: 133-142.

[6] ZHANG S, WU C L, ZHANG C H, et al. Laser surface alloying of FeCoCrAlNi high-entropy alloy on 304 stainless steel to enhance corrosion and cavitation erosion resistance［J］. Optics & Laser Technology, 2016, 84: 23-31.

[8] SHAH K, HAQ I U, KHAN A, et al. Parametric study of development of Inconel-steel functionally graded materials by laser direct metal deposition［J］. Materials & Design, 2014, 54: 531-538.