The boiling point of alloys is not necessarily higher than the boiling point of the metals that compose them. It can be higher, lower, or even similar depending on the specific metals involved and their proportions in the alloy.

Here's why:

* Intermetallic Compounds: Some alloys form intermetallic compounds, which are new substances with unique properties, including boiling points. These compounds might have higher or lower boiling points compared to their constituent metals.

* Alloying Effects: The interaction between different metal atoms in an alloy can influence the strength of the metallic bonds. This can lead to changes in the boiling point compared to the individual metals.

* Vapor Pressure: The boiling point of a substance is related to its vapor pressure. Alloys can have different vapor pressures than their constituent metals, which can affect their boiling points.

Examples:

* Brass (Copper-Zinc alloy): Brass has a higher boiling point than both copper and zinc.

* Bronze (Copper-Tin alloy): Bronze has a lower boiling point than copper but higher than tin.

* Steel (Iron-Carbon alloy): Steel's boiling point is significantly lower than pure iron.

In conclusion, it's not a simple rule of thumb that alloys have higher boiling points than their constituent metals. The boiling point of an alloy is a complex property that depends on the specific metals involved and their interactions within the alloy.