The density of an alloy depends on the specific combination of elements and their proportions within the alloy. Different alloys can have significantly different densities. Here are some examples of popular alloys and their approximate densities:

Aluminum Alloy: The density of aluminum ranges from about 2.7 g/cm³ to 2.9 g/cm³, depending on the specific alloy composition. The most common aluminum alloy, known as 6061, has a density of approximately 2.7 g/cm³.

Steel: Steel is an alloy primarily composed of iron and carbon, with other elements added to enhance its properties. The density of steel varies depending on the type and grade of steel. Generally, the density of steel ranges from 7.8 g/cm³ to 8.1 g/cm³.

Titanium Alloy: Titanium alloys are lightweight and have high strength-to-weight ratios. The density of titanium alloys typically ranges from 4.3 g/cm³ to 4.6 g/cm³. An example is the commonly used grade 5 titanium alloy, which has a density of approximately 4.4 g/cm³.

Copper Alloy: Copper alloys, such as bronze and brass, are widely used in various applications. The density of copper alloys varies depending on the specific composition. Generally, copper alloys have densities ranging from 8.5 g/cm³ to 9.0 g/cm³.

Nickel Alloy: Nickel alloys are known for their excellent corrosion resistance and high-temperature strength. The density of nickel alloys typically ranges from 8.2 g/cm³ to 9.4 g/cm³.

It's important to note that these density values are approximate and can vary depending on the specific alloy composition and manufacturing processes. If you have a specific alloy in mind, it's best to consult the material specifications or consult with a materials engineer for accurate density information.