Part D: Research (Outcomes S2 and S3) Potentially Useful Source for this section: Engineeringlibrary.org

Metals are often used in engineering applications. These metals commonly are used in construction, bridges,

etc and are exposed to stress and respond by elongating, which we call strain. The two stages of elastic

response are called elastic deformation and plastic deformation.

1. Research and summarize what these two deformations are.

2. Try to find a stress/strain plot and the Elastic (Young's) Modulus of your metal. Embed this plot in your

document. Watch this video to learn from: Stress-Strain Diagrams (CU Boulder)

• Watch Understanding Young's Modulus Video from The Efficient Engineer to help you learn and

respond to the following questions.

o What does the elastic modulus value tell us? (What does a high value mean, what does a low

value mean?)

o

How does this value help us understand sagging power lines after a winter storm? (And thus

help engineers decide what material to use and how far apart to place the power poles.)

Would your metal be suitable for use in power lines (or other applications where the wire will

carry a load)?

o

o

For what application is your metal suitable?

3. What is the difference between substitutional and interstitial alloys? See Alloys from LibreTexts for reading.

• What kind of alloy does your metal form? Why and how? Please relate your answer back to the

particular crystal structure that your metal utilizes.

What are the Hume-Rothery rules for alloy formation? See Hume-Rothery Rules Video (CU Boulder)

• Indicate one metal that would easily form a substitutional alloy over the entire composition range with

your metal. Indicate one metal that would not.