Annealed samples of high-purity iron and a mild steel were deformed by cold rolling and their Mossbauer spectra measured. Cold work caused broadening of the 57Fe spectral lines, a constant width being reached at natural strains > ∼ 1·0. The recoilless fraction was not affected by cold work. The line broadening observed was comparable in magnitude to the natural line width and is due predominantly to the local dilation associated with edge dislocations.
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