die Legierung
alloy
A metallic material created by melting together two or more elements, at least one of which is a metal.
Bronze ist eine Legierung aus den Metallen Kupfer und Zinn.
Bronze is an alloy made from the metals copper and tin.

alloy
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alloy
A metallic material created by melting together two or more elements, at least one of which is a metal.
Bronze ist eine Legierung aus den Metallen Kupfer und Zinn.
Bronze is an alloy made from the metals copper and tin.

'Die Legierung' (the alloy) is the noun corresponding to the verb 'legieren' (to alloy metals). The ending '-ung' is very productive in German and forms nouns from verbs that describe the process or the result of the action.
Das Legieren von Metallen erfordert hohe Temperaturen.
Alloying metals requires high temperatures.
To name the components of an alloy, the preposition 'aus' (from/made of) is used with the dative. This structure explains what the alloy consists of.
Stahl ist eine Legierung, die hauptsächlich aus Eisen besteht.
Steel is an alloy that consists mainly of iron.
'Legierung' (alloy) is mainly a technical term from chemistry and materials science. In everyday language, people are more likely to talk about the specific names of alloys such as 'Bronze' (bronze), 'Messing' (brass), or 'Stahl' (steel).
Für diese spezielle Anwendung benötigen wir eine sehr hitzebeständige Legierung.
For this special application, we need a very heat-resistant alloy.
connection / association
'die Verbindung' and 'die Legierung' can both occur in chemistry or materials science, but they do not mean the same thing. A chemical compound is formed when elements are chemically bonded to each other. An alloy is a metallic material made up of several elements; at least one of them is a metal. It may seem like a compound, but in technical language it is something more specific. There is a risk of confusion because both consist of several substances. For metals like bronze or steel, 'Legierung' is more precise; for chemically bonded substances in general, 'Verbindung' fits.

Bronze ist eine Legierung aus Kupfer und Zinn.
Bronze is an alloy of copper and tin.
Im Chemieunterricht haben wir heute eine Verbindung aus zwei Elementen untersucht.
In chemistry class today, we examined a compound made from two elements.