Microstructure and dry sliding wear resistance of CoTi intermetallic alloy

Abstract A wear resistant CoTi intermetallic alloy was fabricated by the laser melting deposition process. Microstructure of the alloy was characterized by OM, SEM, XRD and EDS and wear property was evaluated under room-temperature dry sliding wear test condition. Wear resistance of the CoTi intermetallic alloy under dry sliding wear test condition is up to 2 and 3.3 times higher than the hardened high-speed steel W18Cr4V and the bearing steel 1.0%C–1.5%Cr, respectively. The excellent wear resistance of the CoTi alloy is attributed to the inherent good toughness and strong yield-anomaly of the intermetallic CoTi as well as to the unique strong friction-induced hardening in the worn surface and subsurface of CoTi alloy under dry sliding wear process.

[1]  Shreyes N. Melkote,et al.  Analysis of white layers formed in hard turning of AISI 52100 steel , 2005 .

[2]  D. Rigney,et al.  Sliding wear and transfer , 1983 .

[3]  T. Takasugi,et al.  Plastic flow of B2-type CoTi single crystals , 1990 .

[4]  H. M. Wang,et al.  Microstructure and wear properties of laser clad TiCo/Ti2Co intermetallic coatings on titanium alloy , 2005 .

[5]  Pascal Bellon,et al.  Dry sliding of Cu–15 wt%Ni–8 wt%Sn bronze: Wear behaviour and microstructures , 2007 .

[6]  I. Baker,et al.  On the yield anomaly in stoichiometric CoTi , 2002 .

[7]  A. Karma,et al.  Peritectic coupled growth , 2004 .

[8]  A. R. Rosenfield,et al.  Wear processes in sliding systems , 1984 .

[9]  The formation of spherical wear particles , 1977 .

[10]  M. Wang,et al.  Lamellar structures in laser surface remelted Zn–Cu peritectic alloy under ultra-high temperature gradient , 2004 .

[11]  L. Fang,et al.  Effect of surface work hardening on wear behavior of Hadfield steel , 2007 .

[12]  M. Kok,et al.  Wear resistance of aluminium alloy and its composites reinforced by Al2O3 particles , 2007 .

[13]  Lawrence H. Bennett,et al.  Binary alloy phase diagrams , 1986 .

[14]  Byong-Taek Lee,et al.  High-resolution electron microscopy of dislocations in a B2-type intermetallic compound CoTi , 1995 .

[15]  D. Rigney,et al.  Transfer during unlubricated sliding wear of selected metal systems , 1985 .

[16]  S. Yick,et al.  High temperature wear and corrosion resistance of a Laves phase strengthened Co-Mo-Cr-Si alloy , 2006 .

[17]  W. M. Rainforth,et al.  A quantitative analysis of the influence of carbides size distributions on wear behaviour of high-speed steel in dry rolling/sliding contact , 2007 .

[18]  Yibin Xue,et al.  Microstructure and properties of Ti–Co–Si ternary intermetallic alloys , 2008 .

[19]  Gerry Byrne,et al.  TEM study on the surface white layer in two turned hardened steels , 2002 .

[20]  Han-Young Lee,et al.  Sliding wear properties for Ni–Al based intermetallic compound layer coated on ductile cast iron by combustion synthesis , 2006 .

[21]  Rong Liu,et al.  Development of a new wear-resistant material: TiC/TiNi composite , 1999 .

[22]  Hua-ming Wang,et al.  Microstructure and wear resistance of laser melted W/W2Ni3Si metal silicides matrix in situ composites , 2003 .

[23]  J. Lee,et al.  Eutectic formation in the Ni-Al system , 1994 .

[24]  Y. Kaneno,et al.  Effects of microstructure and environment on room-temperature tensile properties of B2-type polycrystalline CoTi intermetallic compound , 2003 .

[25]  T. Takasugi,et al.  Deformation of CoTi polycrystals , 1988 .

[26]  Yongchang Liu,et al.  Microstructural evolution of rapidly solidified Ti–Al peritectic alloy , 2004 .