How to say "alloy" in Japanese

• 合金ごうきんCommon
  nounCovers the literal sense of a metal made by combining two or more metals. This is the usual word for 'alloy' in technical and everyday contexts, from metallurgy to descriptions of jewelry or machinery.
  真鍮しんちゅうは銅どうと亜鉛あえんの合金ごうきんである。↗

  Brass is an alloy of copper and zinc.
• アロイ
  nounA loanword matching the same literal sense of 'alloy'. It appears in specialized or technical writing, especially in industry contexts, but it is less common than 合金 and rarely the first choice for learners.
  ＯＤＳスーパーアロイは粉末ふんまつ冶金やきん技術ぎじゅつを伴ともなうメカニカルアロイ法ほうにより製造せいぞうされます。↗

  ODS super alloy is produced by the mechanical alloy method following powder metallurgy.
• 混合体こんごうたい
  nounIts primary meaning is 'mixture', a blend of different things, and 'alloy' is only a secondary gloss. It is seldom the word you want for metallic alloys; use it when stressing that something is a mixture of diverse elements.

Use 合金 for the material-science sense of 'alloy' in almost all cases; 「アロイ」 is a loanword alternative that is less common; 混合体 is primarily 'mixture' and only marginally covers 'alloy'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 合金ごうきんalloy
• アロイalloy
• 混合体こんごうたいmixture