Research On The Wear Resistance Of CuZnAl(RE) Shape Memory Alloys

Under oil lubrication and acidic, basic medium, rolling and sliding wear experiments have been done with five kinds of CuZnAl(RE) shape memory alloys hear-treated with four sorts of technologies. The wear performance and law of the alloys are studied under the condition of different loads through a wear period of time and different wear period of time as load is fixed. The wear surface and debris are observed by scanning electron microscope(SEM), and the wear debris solution is analyzed by electron spectorscope, and the phase composition of the alloys are investigated by X-ray diffraction (XRD) ,and the weight loss of wear has been quantified by balance. The test results show that: under oil lubrication, the hear-treatments have effect on the wear performance of the alloys, the order from excellence to inferior of the wear resistance is step quenching 100 , double-stage aging 150 , double-stage aging 100 , step quenching 150 oThe transformation point has also effect on the wear performance of the alloys, the alloy (Ms=26 )has the most performance of wear resistance. The wear resistance of the CuZnAl(RE) shape memory alloy is mainly attributable to super-elasticity , nonlinear elastic module , high yield strength , and stress induced martensite , martensitic preferred orientation; Under acidic , basic medium, the hear-treatments and the transformation point have no obvious effect on the wear performance of the alloys. Because the alloys lose their structural characters -super-elasticity and martensitic preferred orientation under acidic , basic medium, the remote difference between the phase composition of the alloys has little effect on wear performance. The essence of wear is a mutual function process between corruption and adhesion wear , abrasive wear , fatigue wear .