Mechanical cycle performance of 6061Al composites reinforced by(A)uniform distributed SiCp,(B)centralize distributed SiCp,(C)Si3N4 net reinforcement and with(D)carbon fibre reinforcement were investigated experimentally.The results indicated that A,B and C had cyclic hardening,and all had reach the steady state;The Si3N4 net reinforced composite(C)had rapid increase of strength,but had bad plastic nature;The centralize reinforced composite(B)had both the good plastic nature and toughness;The carbon fibre re...