What is Nickel-Titanium Memory Alloy? What features and advantages does it have?
Mar 24, 2023
Nitinol shape memory alloy plate is one of our main nickel-titanium products. So what is a nickel-titanium plate? What performance does it have?
Nickel-titanium shape memory alloy(Nitinol shape memory alloys) is a functional titanium alloy with a shape memory effect. The object is deformed by force at a certain temperature, and after removing the external force it still maintains the shape after deformation, but it can automatically recover to the original shape before deformation at a higher temperature, this phenomenon is known as the shape memory effect.
Titanium-nickel shape memory alloy titanium-nickel is an intermetallic compound of equal atomic ratio (Ti50Ni50), the practical alloy composition is Ti-(49-51)%Ni (atomic fraction). The titanium-nickel intermetallic compound is ductile and can be hot and cold worked, with a cold working rate of 10% to 25% and a recrystallization temperature of 500 to 600°C. Titanium-nickel alloy has excellent corrosion resistance in the high-temperature phase, good damping in the low-temperature phase, and peculiar memory properties and superelasticity in the phase change region. The physical properties, mechanical properties, and memory properties of titanium-nickel alloy are shown in Table 1 and Table 2, respectively. (AS is the beginning temperature of martensite reversal into the parent phase, and Af is the end temperature of martensite reversal into the parent phase).
Table 1 Physical and mechanical properties of titanium-nickel alloys（Niti Nitinol SMA）
|
Density（g·cm-3） |
6.45 |
|
melting point/℃ |
1240∽1310 |
|
specific heat/kJ·（kg·K）-1 |
0.46 |
|
heat conductivity （room temperature）W·（m·K）-1 |
10 |
|
resistivity/10-6Ώ·m |
80 |
|
coefficient of expansion/10-6·K-1 |
10.4 |
|
modulus of elasticity/GPa |
40∽80 |
|
hardness（HV）） |
180∽200（Low temperature phase） |
|
200-350（high temperature phase） |
|
|
tensile strength/MPa |
700-1100 |
|
yield strength /MPa |
50-200 |
|
100-600 |
|
|
elongation/% |
20-60 |
Table 2. Performance property of Nitinol SAM( Nickle-titanium shape memory alloy)
|
phase-transition Af/℃ |
-10∽100 |
|
Recoverable strain/% |
8(maximum strain ） |
|
6（Less repeated times） |
|
|
2（Repeated times，N=105） |
|
|
<0.5（Memory fatigue life，N=107） |
|
|
ultimate-use (limiting service) temperature /℃ |
Af+60 250 |
|
Maximum recovery stress/MPa |
680 |
Nickel-titanium alloy plates have a smooth surface, high dimensional accuracy, good plasticity, and cold processing deformation of up to 40% or more after treatment can obtain excellent super elasticity, widely used in medical bone plates, collection antennae, dental orthodontics, eyeglass frame and foot wire, bra bracket, instrumentation, aviation, aerospace, electronics, petroleum, chemical, pharmaceutical, and other fields, our company uses the multi-directional special processing technology and advanced performance testing instruments to ensure the quality of products and we win trust and support from our many customers.
If you are interested, please contact us. Except for nitinol shape memory alloy plates, we also have wire, rods and bars, tube and pipe, coil, spring, etc, If you have any inquiries or questions, you can email us. We will give you a satisfactory answer. Looking forward to cooperating with you, we are definitely your loyal and reliable manufacturer and supplier of nickel-titanium memory alloys in China.
