Podcast

I finished my podcast script and we recorded it on monday at lunch.
I’m starting work on another about crude oil

Here’s the script:

ALLOYS AND THEIR USES PODCAST

A: Hello! This is the C1A Revision Podcast on Alloys and their Uses.

B: An alloy is a metal which has been mixed with another element to give it better properties for a certain job.

A: One problem with pure metals is that they are too easy to bend because they are made of only one type of atom and arranged in a regular structure made of lots of layers which can easily slide over each other.

B: An example of this is iron. Pure iron is too soft for most uses so we alloy it with other elements to make steel.

A: Iron is usually alloyed with carbon and some other things depending on what the resulting alloy is supposed to be like.

B: Adding non iron atoms disrupts the regular structure because the atoms we add are a different size from the iron atoms already there.

A: This means the atoms aren’t in layers and can’t slide over each other very easily. We will now focus on the different types of steel.

B: Firstly low carbon steel is made of iron and a small amount of carbon, which is why it’s called low carbon.

A: It is cheap to make and easy to shape so it’s used in mass production.

B: Things like containers, cars, knives, machinery and ships are made out of it.

A: Moving on, high carbon steel is made from iron and has quite a lot of carbon in it.

B: It’s more expensive than low carbon steel. It’s strong and brittle and is used in cutting tools.

A: The third type is stainless steel.

B: Stainless steel is made from iron and contains 12.15% chromium and nickel.

A: It is hard, strong and resists corrosion. In other words, it doesn’t rust. We use it in cutlery and containers for corrosive things.

B: Steel isn’t the only type of alloy we use every day: bronze and brass are alloys made from copper.

A; Pure copper is soft and reddish. It is a good conductor of both heat and electricity.

B: If you add tin to copper, you get bronze, which is low friction and used in statues and bearings.

A: Brass is made by adding zinc to copper. It’s much harder than copper but is workable. We use it in musical instruments.

B: Gold is used in jewelry but it’s too soft to use when it’s pure. To make it harder it is alloyed with metals like zinc, copper and silver.

A: Doing that also makes it cheaper and makes it look better. Aluminum is a low density metal which is easily shaped and a good conductor of heat and electricity. Density is how much matter is packed into a certain amount of space.

B: Aluminum has hundreds of alloys, all with different properties. Mainly though we alloy it to make it stronger and to go in aircraft.

A: The final topic in this Podcast is Smart Alloys, the ones that remember their shape.

B: Their technical name is Shape Memory Alloys or SMAs for short.

A: They remember their original shape so if you deform it (or bend it out of shape) it will return to normal after it is heated.

B: SMAs have lots of interesting uses, especially in medicine where they are used in braces and things to hold blood vessels open.

A: Unfortunately, they are more expensive than normal alloys and metals.

B: That concludes C1A Alloys and their uses. Thanks for listening and good luck!

I’ve been thinking about setting up a revision blog. (I used to be thinking about writing a revision guide but I decided a blog would be much easier and more accessible since I probably wouldn’t be able to get the guide published.

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About Matt

I like writing, filmmaking, programming and gaming, and prefer creating media to consuming it. On the topic of consumption, I'm also a big fan of eating.
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