Phase transformation during mechano-synthesis of nanocrystalline/amorphous Fe–32Mn–6Si alloys
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Mechano-synthesis of Fe-32Mn-6Si alloy by mechanical alloying of the elemental powder mixtures was evaluated by running the ball milling process under an inert argon gas atmosphere. In order to characterize the as-milled powders, powder sampling was performed at predetermined intervals from 0.5 to 192 h. X-ray florescence analyzer, X-ray diffraction, scanning electron microscope, and high resolution transmission electron microscope were utilized to investigate the chemical composition, structural evolution, morphological changes, and microstructure of the as-milled powders, respectively. According to the results, the nanocrystalline Fe-Mn-Si alloys were completely synthesized after 48 h of milling. Moreover, the formation of a considerable amount of amorphous phase during the milling process was indicated by quantitative X-ray diffraction analysis as well as high resolution transmission electron microscopy image and its selected area diffraction pattern. It was found that the α-to-γ and subsequently the amorphous-to-crystalline (especially martensite) phase transformation occurred by milling development.
KeywordsFe-Mn-Si shape memory alloys
Argon gas atmospheres
Elemental powder mixture
Fe-mn-si shape memory alloys
Quantitative x ray diffraction
Selected area diffraction patterns
High resolution transmission electron microscopy
Scanning electron microscopy
X ray powder diffraction
Published Version (Please cite this version)http://dx.doi.org/10.1016/j.matchar.2013.07.017
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