Mechanical Properties of Ni-P Coatings Prepared by Electroless Plating on Surface of 5083 Aluminum Alloy

doi:10.12068/j.issn.1005-3026.2015.03.018

Abstract

Abstract: Amorphous Ni-P films were prepared on 5083 aluminum alloy substrates by electroless plating. The mechanical properties of Ni-P films with different strain rates were investigated by nanoindentation tests. It was found that the hardness of Ni-P films is not constant， which depends on depth. Elastic modulus is almost invariable. Discrete displacement bursts and jumping steps in load-depth curves are associated with the loading-rate. The slower the loading rate is， the more obvious the curve steps appear. The discrete displacement burst starts from a single shear band. In a high strain rate， jumping steps do not appear on curves.

Key words: thin amorphous Ni-P films, nanoindentation, mechanical properties, hardness, elastic modulus

CLC Number:

TG113.25

REN Gui-hua， ZHANG Bin. Mechanical Properties of Ni-P Coatings Prepared by Electroless Plating on Surface of 5083 Aluminum Alloy[J]. Journal of Northeastern University Natural Science, 2015, 36(3): 383-387.

References

[1]张广平，王中光.小尺度材料的疲劳研究进展［J］.金属学报，2005，41(1):1-8.(Zhang Guang-ping，Wang Zhong-guang.Progress in fatigue of small dimensional materials［J］.Acta Metallurgica Sinica，2005，41(1):1-8.)
[2]孔德军，付贵忠.5052铝合金表面化学镀Ni-P镀层的组织与性能［J］.中国有色金属学报，2012，22(5):1360-1364.(Kong De-jun，Fu Gui-zhong.Microstructure and properties of Ni-P coatings prepared by chemical plating on surface of 5052 aluminium alloy［J］.The Chinese Journal of Nonferrous Metals，2012，22(5):1360-1364.)
[3]Yazdi S S，Ashrafizadeh F，Hakimizad A.Improving the grain structure and adhesion of Ni-P coating to 3004 aluminum substrate by nanostructured anodic film interlayer ［J］.Surface & Coatings Technology，2013，232:561-566.
[4]Shen Y F，Xue W Y，Liu Z Y.Nanoscratching deformation and fracture toughness of electroless Ni-P coatings［J］.Surface & Coatings Technology，2010，205:632-640.
[5]吴珺仪，李忠盛，吴护林，等.铝合金微弧氧化陶瓷膜表面复合化学镀Ni-P-SiC的研究［J］.表面技术，2013，42(4):52-55.(Wu Jun-yi，Li Zhong-sheng，Wu Hu-lin，et al. Investigation on electroless Ni-P-SiC composite plating on micro-arc oxidation film of aluminium alloy［J］.Surface & Coatings Technology ，2013，42(4):52-55.)
[6]Oliver W C，Pharr G M.An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments［J］. Journal of Materials Research，1992，7(6):1564-1583.
[7]Lam D C C，Chong A C M.Model and experiments on strain gradient hardening in metallic glass［J］.Materials Science and Engineering A，2001，318(1/2):313-319.
[8]Nix W D，Gao H.Indentation size effects in crystalline materials:a law for strain gradient plasticity［J］.Journal of the Mechanics and Physics of Solids，1998，46(3):411-425.
[9]Ma Q，Clarke D R.Size-dependent hardness of silver single-crystals［J］.Journal of Materials Research，1995，10(4):853-863.
[10]Poole W J，Ashby M F，Fleck N A.Micro-hardness of annealed and work-hardened copper polycrystals［J］.Scripta Materialia，1996，34(3):559-564.
[11]Barth E P，Spaepen F，Bye R，et al. Influence of processing on the ductile-to-brittle transition temperature of an Fe-B-Si metallic glass［J］.Acta Materialia，1997，45(1):423-428.
[12]Kim J J，Choi Y，Suresh S，et al. Nanocrystallization during nanoindentation of a bulk amorphous metal alloy at room temperature［J］.Science，2002，295(5555):654-657.
[13]Jiang W H，Atzmon M.The effect of compression and tension on shear-band structure and nanocrystallization in amorphous Al₉₀Fe₅Gd₅:a high-resolution transmission electron microscopy study［J］.Acta Materialia，2003，51(14):4095-4105.
[14]Jiang W H，Pinkerton F E，Atzmon M.Effect of strain rate on the formation of nanocrystallites in an Al-based amorphous alloy during nanoindentation［J］.Journal of Applied Physics，2003，93(11):9287-9290.
[15]Schuh C A，Nieh T G，Kawamura Y.Rate dependence of serrated flow during nanoindentation of a bulk metallic glass［J］. Journal of Materials Research，2002，17(7):1651-1654.
[16]Schuh C A，Argon A S，Nieh T G，et al.The transition from localized to homogeneous plasticity during nanoindentation of an amorphous metal［J］. Philosophical Magazine， 2003，83(22):2585-2597.
[17]Jiang W H，Atzmon M.Rate dependence of serrated flow in a metallic glass［J］.Journal of Materials Research，2003，18(4):755-757.
[18]Nieh T G，Schuh C，Wadsworth J.Strain rate-dependent deformation in bulk metallic glasses［J］.Intermetallics，2002，10(11/12):1177-1182.
[19]Johnson K L.Contact mechanics［M］.Cambridge:Cambridge University Press，1985:84-85.