Overdue - Kajiko

Japanese: 過時効 - かじこう
Overdue - Kajiko

...When this type of grain boundary reaction occurs, the alloy often softens, and in order to prevent this, small amounts of cobalt (Co) are added to Cu-Be alloys, etc.
[Overaging]
GP zones occur in high density (for example, 1017 to 1018 /cm3), but are easily cut by dislocations, and the alloy generally does not become very strong if it is only GP zones. Intermediate phases are not easily cut by dislocations, and the strength of an alloy increases when fine intermediate phases are distributed at high density.

*Some explanations of terms that refer to "expired statutes of limitations" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…この粒界反応型析出を生じると合金が軟化することが多く,Cu‐Be合金などではこの防止のためにコバルトCoが少量添加されている。
[過時効]
 GPゾーンは高密度に(たとえば1017~1018個/cm3)生じるが,転位によって切られやすく,GPゾーンのみの状態では一般にはあまり合金は強化されない。中間相は転位によって切られにくく,微細な中間相を高密度に分布させると合金の強度は高くなる。…

※「過時効」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

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