Grain breakup during elevated temperature deformation of an HCP metal

Peter D. Honniball, Michael Preuss, David Rugg, João Quinta da Fonseca

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21 Citations (Scopus)


A combination of mechanical testing, EBSD and crystal plasticity finite element modeling were used to investigate the influence of temperature on the fragmentation of grains in a zirconium alloy. The results demonstrate that grains of Zircaloy-4 fragment more as the temperature rises. This trend can be explained by an increasing difference between the CRSS values for 〈c+a〉 slip and 〈a〉 slip as temperature rises. This change in relative slip activities with temperature is supported by experimental observations of macroscopic anisotropy and in-grain misorientation axes calculated from EBSD data, as well as plasticity modeling. By tracking the microstructural evolution during deformation, it is shown that the two major texture components fragment to different degrees under the action of prismatic slip. Grains in the (Formula presented.) fiber are significantly more stable than those in the (Formula presented.) fiber, which break up. Grains of the latter fiber fragment heterogeneously as portions of the grain rotate in opposite directions, and some do not rotate at all.

Original languageEnglish
Pages (from-to)2143-2156
Number of pages14
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number5
Publication statusPublished - May 2015
Externally publishedYes

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