Nitinol Transformation Properties
Transformation Temperature...................................-200 to 110 deg. C
Latent Heat of Transformation..................................5.78 cal/g
  Transformation Strain (for polycrystalline material)
    for a single cycle.............................................max 8%
    for 100 cycles.....................................................6%
    for 100,000 cycles.................................................4%
  Hysteresis**..............................................30 to 50 deg. C

Nitinol Physical Properties
  Melting Point.....................................1300 deg. C (2370 deg. F)
  Density...............................................6.45 g/cu.cm (0.233 lb/cu.in)
  Thermal Conductivity
    austenite.........................................0.18 W/cm * deg. C (10.4 BTU/ft * hr * deg. F)
    martensite......................................0.086 W/cm * deg. C (5.0 BTU/ft * hr * deg. F)
  Coefficient of Thermal Expansion
    austenite........................................11.0E-6/deg. C (6.11E-6/deg. F)
    martensite.....................................6.6E-6/deg. C (3.67E-6/deg. F)
  Specific Heat..................................0.20 cal/g * deg. C (0.20 BTU/lb * deg. F)
  Corrosion Performance***.........excellent


Electrical and Magnetic Properties
Resistivity [resistance = resistivity * length / cross-sectional area]
austenite.........................................approx. 100 micro-ohms * cm (39 micro-ohms * in)
martensite......................................approx. 80 micro-ohms * cm (32 micro-ohms * in)
Magnetic Permeability...................< 1.002
Magnetic Susceptibility...............3.0E6 emu/g

Nitinol Mechanical Properties
Young's Modulus****
austenite.......................................approx. 83 GPa (12E6 psi)
martensite....................................approx. 28 to 41 GPa (4E6 to 6E6 psi)
Yield Strength
austenite.......................................195 to 690 MPa (28 to 100 ksi)
martensite....................................70 to 140 MPa (10 to 20 ksi)
Ultimate Tensile Strength
fully annealed..............................895 MPa (130 ksi)
work hardened............................1900 MPa (275 ksi)
Poisson's Ratio...........................0.33
Elongation at Failure
fully annealed...............................25 to 50%
work hardened.............................5 to 10%
Hot Workability..............................quite good
Cold Workability...........................difficult due to rapid work hardening
Machinability.................................difficult, abrasive techniques preferred


**  Values listed are for a full martensite to austenite transition.
Hysteresis can be significantly reduced by partial transformation or ternary alloys.
*** Similar to 300 series stainless steel or titanium
**** Highly nonlinear with temperature