Superelastic cycling and room temperature recovery of Ti74Nb26 shape memory alloy Academic Article

abstract

• The superelastic cyclic response of Ti74Nb26 shape memory alloy (SMA), and the nature of cyclic evolution of its superelastic properties and their unexpected static recovery process after cycling, were investigated at room temperature. The critical stress for stress-induced martensitic transformation (SIM) and stress hysteresis () continuously decrease with increasing number of superelastic cycles. However, cumulative irrecoverable strain during cycling in samples of particular processing conditions increases only up to a certain number of cycles before decreasing with further cycling. Stress-free aging at room temperature after cycling was shown to increase SIM and . The unexpected room temperature recovery is attributed to the recovery of retained martensite and point defects. Similar experiments conducted on conventional Ni-rich Ni-Ti SMAs also show static recovery at room temperature, indicating that the recovery process is not unique to Ti-Nb SMAs. 2009 Acta Materialia Inc.

authors

• Karaman, Ibrahim

published proceedings

• ACTA MATERIALIA

author list (cited authors)

• Ma, J., Karaman, I., Maier, H. J., & Chumlyakov, Y. I.

citation count

• 29

complete list of authors

• Ma, J||Karaman, I||Maier, HJ||Chumlyakov, YI

publication date

• April 2010

publisher

• Elsevier  Publisher

published in

• ACTA MATERIALIA  Journal

keywords

• Cyclic Behavior
• Martensitic Phase Transformation
• Shape Memory Alloys
• Superelasticity
• Titanium Alloys

Digital Object Identifier (DOI)

• 10.1016/j.actamat.2009.12.009

start page

• 2216

end page

• 2224

volume

• 58

issue

• 6

URL

• http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.actamat.2009.12.009