STP1132

    Effect of Tensile Deformation on Crystallographic Texture in Zircaloy Sheet

    Published: Jan 1991


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    Abstract

    The mechanical anisotropy of recrystallized Zircaloy-4 sheet, characterized in terms of anisotropy parameters R and P obtained from contractile strain ratios measured using grid analysis method, showed no strain dependence of these parameters. This linear variation of contractile strains in Zircaloys has been observed by other investigators as well, which misleadingly points to no effect of deformation on crystallographic textures and resulting mechanical anisotropy. Since the deformation caused by slip and twinning reorients the crystallites producing changes in texture even at low strains, the purpose of this study was to investigate the texture rotations caused by tensile deformation along the rolling (RD) and transverse (TD) directions of recrystallized Zircaloy-4 sheet. Tensile deformation along the RD of the sheet showed little effect on the initial bimodal basal texture in the ND-TD plane, which became smoother and unimodal after high (∼20%) tensile strain along the RD. Tensile strain along the TD, on the other hand, exhibited strong texture rotations which resulted in 90 deg rotation of the basal pole distribution making it almost bimodal in the ND-RD plane at high (∼34%) strains, after going through a unimodal (ideal) distribution at intermediate (∼15%) strains. The observed strain independence of anisotropy is explained through combined effects of texture rotations and changes in the macroscopic stress state.

    Keywords:

    Zircaloy, sheet, texture, anisotropy, tensile deformation, recrystallization, texture coefficient, f, -factor, pole figures, texture rotations, slip, twinning


    Author Information:

    Mahmood, ST
    North Carolina State University, Raleigh, NC

    Murty, KL
    North Carolina State University, Raleigh, NC


    Paper ID: STP25503S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP25503S


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