The four-step multiple stage transformation in deformed and annealed Ti 49Ni 51 shape memory alloy

A four-step multiple stage transformation is observed in 20% deformed and 500 °C annealed Ti 49Ni 51 shape memory alloy. Two extra B2 → B19 ′ transformation peaks appear before the previously described B2 → R and R → B19 ′ peaks while cooling, and these correspond to one new peak, which appears afte...

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Bibliographic Details
Published inActa materialia Vol. 52; no. 5; pp. 1117 - 1122
Main Authors Su, P.C, Wu, S.K
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2004
Subjects
Annealing
Cold working
Differential scanning calorimetry
Martensitic transformation
Shape memory alloys
Differential scanning calorimetry
Annealing
Shape memory alloys
Cold working
Martensitic transformation
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Summary:A four-step multiple stage transformation is observed in 20% deformed and 500 °C annealed Ti 49Ni 51 shape memory alloy. Two extra B2 → B19 ′ transformation peaks appear before the previously described B2 → R and R → B19 ′ peaks while cooling, and these correspond to one new peak, which appears after the original B19 ′ → B2 peak during heating. These two extra peaks are caused by the combined effect of severe cold-working and long-time annealing on Ti 49Ni 51 alloy, and they come separately from the B2 → B19 ′ transformation occurring in regions with low and high dislocation densities, which are originally suppressed by cold-working.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2003.10.044