Transformation behavior of nearly stoichiometric Ni-Mn alloys |
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Authors: | Kenji Adachi C M Wayman |
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Affiliation: | (1) United States Naval Postgraduate School, 93940 Monterey, CA;(2) Department of Metallurgy and Mining Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 61801 Urbana, IL |
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Abstract: | The transformation behavior of Ni-Mn alloys in the vicinity of the stoichiometric composition has been studied using transmission
electron microscopy, X-ray diffraction, optical microscopy, and electrical resistivity measurements. The transformation behavior
was found to be markedly different in Mn-rich alloys and Ni-rich alloys. In Mn-rich alloys a martensitic transformation between
L20 (B2) and L10 structures takes place, which possesses many features common to alloys exhibiting a thermoelastic martensitic transformation.
On the other hand, in Ni-rich alloys an order-disorder transformation between A2 and L10 structures occurs. The martensitic transformation features {111} transformation twins as the transformation substructure
while the ordering reaction involves {101} order twins. In the Mn-rich alloys, the martensitic phase, if either slowly cooled
or annealed at intermediate temperatures, becomes “tempered”, resulting in a noncrystallographic, essentially featureless
microstructure apart from the presence of occasional {111} twins.
Formerly with University of Illinois. |
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