Author/Authors :
Yan، نويسنده , , J.Y. and Sun، نويسنده , , Y.D. and Li، نويسنده , , D.J. and Liu، نويسنده , , M.Y. and Dong، نويسنده , , L. and Cao، نويسنده , , M. and Gao، نويسنده , , C.K. John Wang، نويسنده , , N. and Deng، نويسنده , , X.Y. and Gu، نويسنده , , H.Q. and Wan، نويسنده , , R.X. and Sun، نويسنده , , X.، نويسنده ,
Abstract :
TiAlN/TiB2 multilayers which have various modulation ratios (tTiAlN:tTiB2) ranging from 1:6 to 18:1 were synthesized on Al2O3(111) substrate by ion beam assistant deposition (IBAD). The effects of annealing on the mechanical and structural properties of the multilayers were investigated using X-ray diffractometry (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and Nanoindenter (CSM instruments). It was found that the hardness for all multilayers was higher than TiAlN or TiB2 monolayer and the highest hardness of 43 GPa was attained at tTiAlN:tTiB2 = 16:1. The multilayers show the polycrystallines of TiAlN(111) and (220) textures. The thermal stability characteristics of the multilayers were studied in vacuum furnace for 30 min at temperatures of 500 and 700 °C. Compared with as-deposited multilayers, the annealed multilayers displayed a stable hardness and elastic modulus and an increased fracture resistance. It was found that the multilayers showed good thermal stability.
Keywords :
TiAlN/TiB2 multilayers , Ion beam assisted deposition , Hardness , thermal stability , Annealing
