NiTi Smart
Sheet(sm)

Selected Properties of NiTi


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

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

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


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