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The plastic deformation of the pipe made of Cu-based alloy hardened by incoherent nanoparticles and subjected to the uniform internal pressure was investigated.The limits of elastic and plastic resistance are determined.The insignificant excess in the limit of the elastic resistance enables the plastic deformation in the most part of the pipe wall.The densities of shear-forming dislocations and prismatic dislocation loops are higher in alloys strengthened with coarse particles than in alloys strengthened with fine particles.At small distances between the strengthening particles,this effect is the most pronounced.