SMA and PZT in Mechatronics & Smart Materials
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Questions and Answers

What is the main reason behind the unique properties of shape memory alloys (SMA's)?

  • Solid state phase change and molecular rearrangement (correct)
  • Complex FCC structure
  • Temperature-dependent crystal structures
  • Composition of Nickel Titanium
  • Which phase of the shape memory metal alloy is hard, firm, and inelastic?

  • Copper Aluminum phase
  • Austenite (correct)
  • Martensite
  • Nickel Titanium phase
  • What role does the martensite phase of the shape memory metal alloy play in its behavior?

  • It is hard and inelastic, similar to austenite
  • It maintains a complex FCC structure
  • It is soft and elastic, allowing easy deformation (correct)
  • It resembles titanium in its properties
  • What happens to the shape memory alloy as it is cooled to the martensite phase?

    <p>It can be easily deformed</p> Signup and view all the answers

    What quality allows the shape memory alloy to reform to its original shape when the temperature is raised to the austenite phase?

    <p>Ability to 'remember' its austenite phase</p> Signup and view all the answers

    What is pseudoelasticity in shape memory alloys (SMAs)?

    <p>The ability of the alloy to withstand strains of up to 8% and return to the austenite phase when the load decreases or there is a change in temperature</p> Signup and view all the answers

    What is the most common mix of shape memory alloys (SMAs) based on the text?

    <p>Roughly 50% nickel and 50% titanium</p> Signup and view all the answers

    How does pseudoelasticity (superelasticity) occur in shape memory alloys (SMAs)?

    <p>When the alloy is above the martensite temperature, but there is a load strong enough to force the austenite into the martensite phase, and it does not return to the austenite phase until the loading is decreased or there is a large enough change in temperature</p> Signup and view all the answers

    What are Flexinol wires designed to do according to the text?

    <p>Take more repeated stress cycles than pure NiTi mixes</p> Signup and view all the answers

    In what biological applications can Nitinol wires be used based on the text?

    <p>Bone plates, surgical anchors, clot filters, catheters, retainers, eyeglasses, and aircraft maneuverability</p> Signup and view all the answers

    What are the two unique properties exhibited by shape memory alloys (SMA's)?

    <p>Pseudo-elasticity and the shape memory effect</p> Signup and view all the answers

    What temperature dependent crystal structures do shape memory metal alloys exist in?

    <p>Martensite and austenite</p> Signup and view all the answers

    What happens to the shape memory alloy as it is cooled to the martensite phase?

    <p>It can be easily deformed</p> Signup and view all the answers

    What type of structure does the austenite phase of shape memory metal alloy have?

    <p>Simple FCC structure</p> Signup and view all the answers

    What quality allows the shape memory alloy to reform to its original shape when the temperature is raised to the austenite phase?

    <p>Ability to remember its austenite phase</p> Signup and view all the answers

    What is the main characteristic of pseudoelasticity (superelasticity) in shape memory alloys (SMAs)?

    <p>The alloy changes to the martensite phase when subjected to strain.</p> Signup and view all the answers

    What is the purpose of Flexinol wires, as mentioned in the passage?

    <p>To lift heavy loads with minimal electric current.</p> Signup and view all the answers

    What is the role of the martensite phase in shape memory metal alloy behavior?

    <p>It allows the alloy to change shape depending on temperature.</p> Signup and view all the answers

    What quality allows Nitinol wires to promote healing in biological applications?

    <p>Memory effect to pull bones together and prevent tissue damage.</p> Signup and view all the answers

    What happens to Nitinol wires when subjected to a change in temperature, as mentioned in the passage?

    <p>They change states at different temperatures within a narrow range.</p> Signup and view all the answers

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