Study on friction coefficient in the compression at high temperatures of ultrahigh strength Al-Zn-Mg-Cu alloy produced by spray deposition

Friction coefficients and lubricative mechanics of Al-Zn-Mg-Cu-Zr-Sc-Ni alloy produced by spray deposition were researched by means of ring compression and FEM simulation under four conditions at 370 ℃ and 420 ℃.Results show that the condition of friction interface is improved when alloy is lubricated by pure aluminum together with graphite and oil,while the frication coefficient is only 1/4～1/5 of those without lubrication.The cracks and single-drum bulging would be emerged easily in the outermost-edge of the rings,and the friction coefficient is the key factor influencing the FEM simulation result in comparison with the test result.