So let’s say you have a big bag of candy. And some of those candies are Skittles, some are M&M's, and some are gummy bears. Each of those candies has a different flavor, right?
Now let’s say you mix all of those candies together in one big bowl. You still have Skittles, M&M's, and gummy bears, but the flavors get all mixed up. You might not be able to tell which candy is which just by tasting it.
That’s kind of like what happens with metals when you mix different kinds together to make alloys. Alloys are like metal candy blends. Different metals have different properties. Some are harder, some are more flexible, and so on. But when you mix them together, those properties get all mixed up too. It’s harder to tell which metal is which just by looking at it or testing it.
That’s what we mean when we talk about alloy broadening. It’s like mixing different colored paints together to make a new color. The more colors you add, the harder it is to tell which one is which. The same thing happens with metals in alloys. The more different metals you mix, the broader the range of properties you get. That makes it harder to pin down exactly what each metal is contributing to the overall properties of the alloy.