Internal stresses and microstructure in plastically deformed metals and alloys as revealed by asymmetric x-ray line broadening

H. Mughrabi, T. Ungar, H. Biermann

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Abstract

Dislocation distributions in plastically deformed single-phase metals and second-phase particle distributions in alloys, especially in γ′-precipitation hardened Ni-base superalloys are heterogeneous microstructures. The constituents of a heterogeneous microstructure usually have different elastic and plastic properties and the plastic straining of such a material can be described, in the simplest case, by a two-component composite model. Considering the two constituents of a composite as hard and soft components, and assuming that they are strained in parallel, it can be shown that after unloading the two regions remain under the effect of residual internal stresses acting in the forward and backward directions relative to the applied stress, respectively. The locally varying residual internal stresses impose a locally alternating tetragonal elastic distortion, which is manifested by a characteristically asymmetric X-ray line broadening. It will be shown that the residual long-range internal stresses, which play an important role in the work hardening and the mechanical properties of single-phase materials and γ′-hardened Ni-base superalloys, prevail after very different modes of deformation and over a wide range of strain.

Original languageEnglish
Pages (from-to)437-460
Number of pages24
JournalMechanical and corrosion properties. Series A, Key engineering materials
Volume97-98
Publication statusPublished - Dec 1 1994
EventProceedings of the 6th International Symposium on Plasticity of Metals and Alloys, ISPMA 6. - Prague, Czech Repub
Duration: Sep 5 1994Sep 9 1994

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ASJC Scopus subject areas

  • Engineering(all)

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