J.H. Yang and T.H. Zhang(Nantong Institute of Technology
,
Nantong 226007
,
China)(Radiation Beam and Materials Engineering Lab
,
Beijing Normal University
,
Beijing 100875
,
China)
金属学报(英文版)
Ta and C ions extracted from a MEVVA ion source were implanted into Cr12 steel, with an implantation dose of (1-5)x1017cm-2, extraction acceleration 42kV, and average ion beam flux about 20-50μA·cm-2. Rutherford backscattering spectrum (RBS) was used to measure the surface composition after Ta and Ta+C implantation. Analysis of phase formed by Ta and C implantation was carried out by X-ray diffraction analysis (XRD). Experiment results showed that the wear rate of the implanted layer dropped 40% for Ta ion implantation and by a factor of 2.7 for Ta+C dual ion implantation. Ta+C dual ion implantation was found to reduce the friction coefficient of Cr12 steel. The wear mechanisms of the implanted layer were discussed.
关键词:
wear resistance
,
null
,
null
S.Q. Duan
,
S.J. Liu and B.K. Ma(Department of Physics
,
Beijing Normal University
,
Beijing 100875
,
China)
金属学报(英文版)
Electronic structure calculations using the tighting-binding linear muffin-tin orbital (TB-LMTO) method have been performed for Co3Ti and its hydride CO3Ti. The computed values of lattice constants and bulk moduli agree with the experiment values. The theoritical excess enerpy and lattice staid due to hydrogen absorption consequently obtained hem the ab initio results indicate that H has the tendency to stay in Co3Ti and the ionicities of Co atomic spheres due to hydmpen absorption change from the canons to the ations. On the other hand, the changes of band structures due to hydrogenation are found to be remarkable.
关键词:
total enerpy
,
null
,
null
