The cyclic behaviours of two prestrained materials with different slip modes have been com-pared.From the analysis of hysterisis loops,it is suggested that the
Equilibrium equation of point defects in Ll<sub>2</sub> type intermetallic compounds was established tocalculate the relations of the concentration of antisite
It is obtained in this paper that the fatigue threshold value of mode H was 1.9 times of that ofmode Ⅰ in dual-phase steel(DPS),and the normal stress intensity f