Abstract
Ni2Mn1+xZ1-x (Z = In, Sn or Sb) undergo martensitic transformation with transformation temperature (TM) scaling with the average valence electron per atom (e/a) ratio. However, the rate of increase of TM depends on the type of Z atom, with the slope of TMvs. e/a curve increasing from Z = In to Z = Sb. Local structural distortions are believed to be the leading cause of martensitic transformation in these alloys. A careful study of the Ni and Mn local structures in several Ni2Mn1+xZ1-x alloys with varying e/a ratio and the same Z atom, with the same e/a ratio but different Z atoms and with the same TM but with different Z atoms and different e/a ratio, revealed that the difference between Ni-Mn and Ni-Z nearest neighbor distances decreases as the Z atom changes from In to Sb. This decrease in the local structural distortion accommodates a higher content of Mn until the L21 structure becomes unstable and the alloy undergoes a martensitic transformation.
Published Version
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