Published online by Cambridge University Press: 01 January 1992
We present some results regarding the influence of grinding atmosphere on the phenomena occurring during mechanical milling of a Ni3Al-base alloy. We have disordered this permanently ordered alloy by ball-milling in a vibratory mill, using alternatively argon and hydrogen atmospheres. We observed a slower reduction of the long-range order parameter during experiments carried out under a hydrogen atmosphere, regardless of the used grinding media. We discuss our Findings in terms of the effects, such as in grain boundary cohesive strength or localize ductility enhancement, that hydrogen may induce in such alloy. The microstructural parameters of the powders at different stages of disordering have been investigated using calorimetric tests, x-ray diffraction analysis and microscopic observations.
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