ADJ (of a mixture or alloy with two components) containing more of the minor component than a eutectic mixture 过共晶的 → compare hypoeutectic
In order to improve the micro-structure and the properties, the components of the nodular cast iron ball should be controlled in the point of eutectic or hyper-eutectic near the point of eutectic.
为改善球铁磨球的显微组织及性能，球铁成分应控制在共晶或稍过共晶处。
The dimension stability of hyper eutectic Al Si alloy piston is higher than that of eutectic Al Si alloy piston.
过共晶铝合金活塞的尺寸稳定性高于共晶铝合金活塞；
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