e measured. The fracture surface morphologies were observed and analyzed by SEM. The results indicate that rare earth elements can effectively promote the interfacial adhesion between the glass fiber and PTFE, owing to the effects of rare earth elements on the compatibility. The tensile properties of GFPPTFE composites can be improved considerably when the content of RE in surface modifier is 0.2 %～014%, and the optimum performance of GFPPTFE composites is obtained at 0.3 %RE content.

Effects of heat treatment and high-temperature equal-channel angular extrusion (ECAE) process on transformation behaviors of Ti-50.3at.%Ni shape memory alloy (SMA) were investigated by differential scanning calorimeter (DSC) measurements. The martensitic transformation start temperature of TiNi alloy decreased sharply after high-temperature ECAE processes, then rapidly rose back after the specimen annealing at 773K for 2h. Reasons for the changes of phase transformation behaviors have been discussed.

Equal channel angular extrusion (ECAE) process was a deep pure shear deformation method for structural materials, developed in early 90s. ECAE technique has been successfully applied to several pure metals and alloys to refine the microstructure and improve the mechanical properties of materials. In the present paper, TiNi shape memory alloys have been treated by ECAE process. The effects of ECAE process on microstructures and transformation behaviors have been investigated. The initial coarse grains of TiNi alloy were refined after two passes of ECAE processes and short annealing at 1023 K. Transformation temperatures of TiNi alloy sharply decreased after two ECAE processes, then rapidly rose back when annealed at 773K for 2h.

The friction and wear properties under impact load and dry friction conditions of metal2plastic multilayer composites filled with glass fiber, treated with rare earth elements, were investigated. The worn surfaces were observed and analyzed by scanning electron microscopy (SEM). It shows that applying rare earth elements surface modifier to treat the glass fiber surface can enhance the interfacial adhesion between the glass fiber and polytetrafluoroethylene (PTFE), as well as promote the interface properties of the composites. This helps to form a uniformly distributed and high adhesive transfer film on the counterface and abate the friction between the composite and the counterface. As a result, the wear of composite is greatly reduced. The composite exhibits excellent friction properties and impact wear2resistance.