20 Questions
What is the main reason behind the unique properties of shape memory alloys (SMA's)?
Solid state phase change and molecular rearrangement
Which phase of the shape memory metal alloy is hard, firm, and inelastic?
Austenite
What role does the martensite phase of the shape memory metal alloy play in its behavior?
It is soft and elastic, allowing easy deformation
What happens to the shape memory alloy as it is cooled to the martensite phase?
It can be easily deformed
What quality allows the shape memory alloy to reform to its original shape when the temperature is raised to the austenite phase?
Ability to 'remember' its austenite phase
What is pseudoelasticity in shape memory alloys (SMAs)?
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
What is the most common mix of shape memory alloys (SMAs) based on the text?
Roughly 50% nickel and 50% titanium
How does pseudoelasticity (superelasticity) occur in shape memory alloys (SMAs)?
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
What are Flexinol wires designed to do according to the text?
Take more repeated stress cycles than pure NiTi mixes
In what biological applications can Nitinol wires be used based on the text?
Bone plates, surgical anchors, clot filters, catheters, retainers, eyeglasses, and aircraft maneuverability
What are the two unique properties exhibited by shape memory alloys (SMA's)?
Pseudo-elasticity and the shape memory effect
What temperature dependent crystal structures do shape memory metal alloys exist in?
Martensite and austenite
What happens to the shape memory alloy as it is cooled to the martensite phase?
It can be easily deformed
What type of structure does the austenite phase of shape memory metal alloy have?
Simple FCC structure
What quality allows the shape memory alloy to reform to its original shape when the temperature is raised to the austenite phase?
Ability to remember its austenite phase
What is the main characteristic of pseudoelasticity (superelasticity) in shape memory alloys (SMAs)?
The alloy changes to the martensite phase when subjected to strain.
What is the purpose of Flexinol wires, as mentioned in the passage?
To lift heavy loads with minimal electric current.
What is the role of the martensite phase in shape memory metal alloy behavior?
It allows the alloy to change shape depending on temperature.
What quality allows Nitinol wires to promote healing in biological applications?
Memory effect to pull bones together and prevent tissue damage.
What happens to Nitinol wires when subjected to a change in temperature, as mentioned in the passage?
They change states at different temperatures within a narrow range.
Test your understanding of shape memory alloys (SMA's) and lead zirconate titanate (PZT) in the context of mechatronics and smart materials. Explore the unique properties and applications of SMA's and PZT in engineering.
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