Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti...
Transcript of Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti...
![Page 1: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/1.jpg)
Francisco M. Braz Fernandes
Heat Treating of NiTi Shape Memory Alloys
![Page 2: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/2.jpg)
Ni-Ti System
Ligasricas em Ti
Ligasricas em Ni
W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999) 3457-3468
Austenite(B2)
Cubic
Martensite(B19’)
Monoclinic
R-phase(R)
Rhombohedral
![Page 3: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/3.jpg)
-20 0 20 40 60 80 100 120 140-500-400-300-200-100
0100200300400500600700
Hea
t Flo
w (W
/g) x
10-3
Temperature (ºC)-60 -40 -20 0 20 40 60 80
-300-250-200-150-100-50
050
100150200250300
Hea
t Flo
w (W
/g) x
10-3
Temperature (ºC)-60 -40 -20 0 20 40 60
-300-250-200-150-100-50
050
100150200250300
Hea
t Flo
w (W
/g) x
10-3
Temperature (ºC)-80 -60 -40 -20 0 20 40 60
-300-250-200-150-100-50
050
100150200250300
Hea
t Flo
w (W
/g) x
10-3
Temperature (ºC)
AR 400C 450C 500C 550C 600C-30-15
0153045607590
105120135150
Tran
sfor
mat
ion
Tem
pera
ture
(ºC
)
Sample ConditionAR 400C 450C 500C 550C 600C
-60-45-30-15
0153045607590
Tran
sfor
mat
ion
Tem
pera
ture
(ºC
)
Sample ConditionAR 400C 450C 500C 550C 600C
-75-60-45-30-15
015304560
Tran
sfor
mat
ion
Tem
pera
ture
(ºC
)
Sample ConditionAR 400C 450C 500C 550C 600C
-90-75-60-45-30-15
015304560
Tran
sfor
mat
ion
Tem
pera
ture
(ºC
)Sample Condition
IncreasingIncreasing NiNi contentcontent
Heat treatments / chemical composition
![Page 4: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/4.jpg)
[347] FanG, ChenW, Yang S, Zhu J, RenX, Otsuka K. Acta Mater 2004;52:4351.
Precipitation
![Page 5: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/5.jpg)
HeatHeat TreatmentTreatmentTemperatureTemperature: : 350350ººC C 450450ººCC 550550ººCC
Functionally Graded Materials
![Page 6: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/6.jpg)
Thermomechanical treatments
× / +× / +⊗ / ⊕⊗ / ⊕⊗ / ⊕600ºC
×× / +×× / +× / +× / ⊕⊗ / ⊕550ºC
×× / +×× / +× / +× / ⊕⊗ / ⊕500ºC
×× / +×× / +×× / +×× / +× / ⊕450ºC×× / +×× / +×× / +×× / +×× / ⊕400ºC×× / +×× / +×× / +×× / +×× / ⊕AR
Alloy “N”(51.0 at% Ni)
Alloy “S”(50.8 at% Ni)
Alloy “B”(50.2 – 50.4 at% Ni)
Alloy “M”(49.8 – 50.0 at% Ni)
Alloy “H”(49.4 – 49.6 at% Ni)
Phase Transformation on Cooling / on HeatingSample
Condition
× / +× / +⊗ / ⊕⊗ / ⊕⊗ / ⊕600ºC
×× / +×× / +× / +× / ⊕⊗ / ⊕550ºC
×× / +×× / +× / +× / ⊕⊗ / ⊕500ºC
×× / +×× / +×× / +×× / +× / ⊕450ºC×× / +×× / +×× / +×× / +×× / ⊕400ºC×× / +×× / +×× / +×× / +×× / ⊕AR
Alloy “N”(51.0 at% Ni)
Alloy “S”(50.8 at% Ni)
Alloy “B”(50.2 – 50.4 at% Ni)
Alloy “M”(49.8 – 50.0 at% Ni)
Alloy “H”(49.4 – 49.6 at% Ni)
Phase Transformation on Cooling / on HeatingSample
Condition
-40 -20 0 20 40 60 80 100 120-300-250-200-150-100-50
050
100150200250300
Hea
t Flo
w (W
/g) x
10-3
Temperature (ºC)AR 400C 450C 500C 550C 600C
-30-15
0153045607590
105120
Tran
sfor
mat
ion
Tem
pera
ture
(ºC
)
Sample Condition
![Page 7: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/7.jpg)
εε(N=1) (N=1) = = 0,610,61
Severe Plastic DeformationECAP (Equal Channel Angular Pressing)
![Page 8: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/8.jpg)
HeCeTo
Severe Plastic DeformationECAP (Equal Channel Angular Pressing)
![Page 9: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/9.jpg)
XRD
2- Theta º
![Page 10: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/10.jpg)
Resultados
2- Theta º
![Page 11: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/11.jpg)
Resultados
2- Theta º
![Page 12: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/12.jpg)
Resultados
2- Theta º
![Page 13: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/13.jpg)
PowderMetallurgy
![Page 14: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/14.jpg)
AcknowledgementsA. Pereira (CENIMAT)A.S. Paula (CENIMAT, now with Universidade Federal Fluminense – UFF),C. Baetz (ROBL – ESRF; HZDR),F. Neves (CENIMAT, now with LNEG),K.K. Mahesh (CENIMAT, now with Vivekananda College of Engineering & Technology), M.T. Nogueira (CENIMAT),N. Schell (P07-PETRA, HZG), R.J.C. Silva (CENIMAT),R.M.S. Martins (CENIMAT, ITN),
![Page 15: Heat Treating of NiTi Shape Memory Alloys - eventos.fct.unl.pt · Ni-Ti System Ligas ricas em Ti Ligas ricas em Ni W. Tang, B. Sundman, R. Sandström, C. Qiu. Acta materialia 47 (1999)](https://reader030.fdocuments.us/reader030/viewer/2022040712/5e15926c3c187232b503e598/html5/thumbnails/15.jpg)