Supersaturated solid solution

… When an Al-4% Cu alloy is held at 500°C, a solid solution is formed in which Cu atoms randomly occupy the lattice sites of Al atoms. When this solid solution is rapidly cooled (quenched) to 0°C, the solid solution does not have time to produce a precipitate, and the solute atoms Cu are supersaturated in the solid solution, resulting in a supersaturated solid solution. This process is called solution treatment. …

*Some of the terminology explanations that mention "supersaturated solid solution" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　Al‐4％Cu合金を500℃に保持すると，Cu原子がAl原子の格子点を無秩序に占める固溶体が形成される。この固溶体を0℃まで急速に冷却(焼入れ)すると，固溶体から析出相を生じる暇がなく，溶質原子Cuが過飽和に固溶された過飽和固溶体の状態となる。この操作を溶体化処理という。…

※「過飽和固溶体」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報