Details
| Original language | English |
|---|---|
| Pages (from-to) | 2216-2224 |
| Number of pages | 9 |
| Journal | Acta materialia |
| Volume | 58 |
| Issue number | 6 |
| Publication status | Published - 22 Jan 2010 |
| Externally published | Yes |
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 (σSIM) and stress hysteresis (Δσ) 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 σSIM and Δσ. 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.
Keywords
- Cyclic behavior, Martensitic phase transformation, Shape memory alloys, Superelasticity, Titanium alloys
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Polymers and Plastics
- Materials Science(all)
- Metals and Alloys
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In: Acta materialia, Vol. 58, No. 6, 22.01.2010, p. 2216-2224.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Superelastic cycling and room temperature recovery of Ti74Nb26 shape memory alloy
AU - Ma, J.
AU - Karaman, I.
AU - Maier, H. J.
AU - Chumlyakov, Y. I.
PY - 2010/1/22
Y1 - 2010/1/22
N2 - 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 (σSIM) and stress hysteresis (Δσ) 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 σSIM and Δσ. 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.
AB - 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 (σSIM) and stress hysteresis (Δσ) 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 σSIM and Δσ. 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.
KW - Cyclic behavior
KW - Martensitic phase transformation
KW - Shape memory alloys
KW - Superelasticity
KW - Titanium alloys
UR - http://www.scopus.com/inward/record.url?scp=76249114297&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2009.12.009
DO - 10.1016/j.actamat.2009.12.009
M3 - Article
AN - SCOPUS:76249114297
VL - 58
SP - 2216
EP - 2224
JO - Acta materialia
JF - Acta materialia
SN - 1359-6454
IS - 6
ER -