[1] [1] GU D D, SHEN Y F, LU Z J. Microstructural characteristics and formation mechanism of direct laser-sintered Cu-based alloys reinforced with Ni particles ［J］. Materials and Design, 2009,30:2099-2107.

[2] [2] SMUROV I. Laser cladding and laser assisted direct manufacturing ［J］. Surface & Coatings Technology, 2008,202:4496-4502.

[3] [3] ZHANG F Y, CHEN J, TAN H,et al.. Composition control for laser solid forming from blended elemental powders ［J］. Optic. Laser. Technol.， 2009,41:601-607.

[4] [4] YANG N. Concentration model based on movement model of powder flow in coaxial laser cladding ［J］. Optic. Laser. Technol.， 2009,41:94-98.

[5] [5] LIU Y W. Binding strength between coating layer and the substrate cladded Ni-base alloy on the copper alloy by laser ［J］. Opt. Precision Eng., 1997,5(1):62-66. (in Chinese)

[6] [6] POPRAWE R.Laser Manufacture Technics［M］. Beijing: Tsinghua University Press, 2008:149-153. (in Chinese)

[7] [7] LIU Y W. Analysis of microstructure between Ni-Cr-B-Si laser cladding layers and H62 brass bases ［J］. Opt. Precision Eng., 2000,8(1):26-28. (in Chinese)

[8] [8] ZHONG M L, LIU W J. Leading areas and hot topics on global laser materials processing research ［J］. Chinese Journal of Lasers， 2008,35(11):1653-1659. (in Chinese)

[9] [9] ZHANG Q M, LIU X M, GUANG Z Z, et al.. Fundamental investigation on overlapping coating formed by broad-beam powder feeding cladding ［J］. Heat Treatment of Metals, 2001(2):25-28. (in Chinese)

[10] [10] LIU X M.An Investigation on the fundamentals of powder feeding type laser cladding ［D］. Changchun: Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences,1998:87-89. (in Chinese)

[11] [11] LI Y X,WU A P. Principle of Materials Processing［M］. Beijing: Tsinghua University Press,2006:132-136. (in Chinese)

[12] [12] HUANG W D, LIN X, CHEN J, et al.. Laser Three-dimensional Forming ［M］. Xian: Northwestern Polytechnical University Press, 2007:50-70. (in Chinese)