Tensile tests on a FeNi-base austenitic alloy were conducted at room temperature (RT) and 400 degrees C, when serrated flow did not and did occur, respectively. Deformation microstructures such as topographies of slip bands (SBs), morphologies of twin boundaries (TBs) and arrangements of dislocations near TBs, as well as concentrations of strain were investigated. It is shown that TBs block SBs and induce remarkable stress accumulations at 400 degrees C. Effect of TB-density on the serrated flow was also investigated by comparative tensile tests on specimens with different TB densities at 400 degrees C. Details of tensile curves reveal that more TBs induce more pronounced serrations. Therefore, interaction between TBs and SBs is proposed to induce the serrated flow of the FeNi-base alloy at 400 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
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