TY - JOUR
T1 - Effects of aging on the shape memory and superelasticity behavior of ultra-high strength Ni54Ti46 alloys under compression
AU - Kaya, I.
AU - Tobe, H.
AU - Karaca, H. E.
AU - Basaran, B.
AU - Nagasako, M.
AU - Kainuma, R.
AU - Chumlyakov, Y.
N1 - Funding Information:
This work was supported in part by the NASA Fundamental Aeronautics Program, Supersonics Project and the NASA EPSCOR program under Grant no: NNX11AQ31A , KY EPSCoR RID program under Grant no: 3049024332 and RFBR project with Grant no: 10-03-0154-a . I.K. acknowledges the support from Anadolu University (Grant no. BAP-1605F390 ).
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/12/15
Y1 - 2016/12/15
N2 - This study investigates the effects of aging on the shape memory and superelasticity behavior of a Ni-rich Ni54Ti46 (at%) alloy. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and compression test (thermal cycling under stress and superelasticity) were carried out after 3 h agin;g from 450 °C to 600 °C. The alloys show recoverable shape memory effect with transformation strains of about 1% and narrow hysteresis under high stress levels. The work output of 14.1 Jg−1 was observed at an ultra-high stress level of 1500 MPa after 600 °C 3 h aging. 450 °C 3 h aging resulted in a very narrow temperature hysteresis of 8°C under an ultra-high stress level of 1500 MPa. At room temperature, the superelastic response with 4% total strain was obtained even when high stress level of 2000 MPa is applied after 550 °C 3 h aging.
AB - This study investigates the effects of aging on the shape memory and superelasticity behavior of a Ni-rich Ni54Ti46 (at%) alloy. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and compression test (thermal cycling under stress and superelasticity) were carried out after 3 h agin;g from 450 °C to 600 °C. The alloys show recoverable shape memory effect with transformation strains of about 1% and narrow hysteresis under high stress levels. The work output of 14.1 Jg−1 was observed at an ultra-high stress level of 1500 MPa after 600 °C 3 h aging. 450 °C 3 h aging resulted in a very narrow temperature hysteresis of 8°C under an ultra-high stress level of 1500 MPa. At room temperature, the superelastic response with 4% total strain was obtained even when high stress level of 2000 MPa is applied after 550 °C 3 h aging.
KW - High strength shape memory alloy
KW - Multiple step phase transformation
KW - Ni-rich NiTi shape memory alloy
KW - R-phase transformation
KW - Thermomechanical loading
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U2 - 10.1016/j.msea.2016.09.078
DO - 10.1016/j.msea.2016.09.078
M3 - Article
AN - SCOPUS:84989160286
SN - 0921-5093
VL - 678
SP - 93
EP - 100
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -