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Mechanism of the TiNi Martensitic Transformation and the Crystal Structures of TiNi-II and TiNi-III Phases
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Based on combined x-ray and neutron-diffraction data, an inference for the coexistence of the B2(CsCl) and P3̄m1 structures in the TiNi-II phase is made. Other experimental evidence indicates the proportion of the B2 to P3̄m1 structures to depend critically on the thermal and mechanical history of the alloy. Through a mechanism of an inhomogeneous-but-cooperative atomic shear in the 〈111〉B2 direction and a factor sequence, −(0−1−1̄)n− in the (110)B2 plane, the B2 and P3̄m1 structures transform into P1̄ abd P6/m structures, respectively, during the TiNi-II to TiNi-III martensitic transformation. Subsequent submicrotwinning at atomic level of the P1̄ structure leads to the P1 structure. Therefore, the TiNi-III (``martensite'') phase may consist of the P1̄, P1, and P6/m structures.
Title: Mechanism of the TiNi Martensitic Transformation and the Crystal Structures of TiNi-II and TiNi-III Phases
Description:
Based on combined x-ray and neutron-diffraction data, an inference for the coexistence of the B2(CsCl) and P3̄m1 structures in the TiNi-II phase is made.
Other experimental evidence indicates the proportion of the B2 to P3̄m1 structures to depend critically on the thermal and mechanical history of the alloy.
Through a mechanism of an inhomogeneous-but-cooperative atomic shear in the 〈111〉B2 direction and a factor sequence, −(0−1−1̄)n− in the (110)B2 plane, the B2 and P3̄m1 structures transform into P1̄ abd P6/m structures, respectively, during the TiNi-II to TiNi-III martensitic transformation.
Subsequent submicrotwinning at atomic level of the P1̄ structure leads to the P1 structure.
Therefore, the TiNi-III (``martensite'') phase may consist of the P1̄, P1, and P6/m structures.
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