铝合金的时效理论首先来自对合金在生产和使用中的实践。没有铝合金的大量生产、研究和使用中的实践,要了解它们在时效过程中的变化规律是不可能的。人类对铝合金时效现象的最早发现,是硬铝于淬火之后在室温下硬度和强度的升高现象。但是当时对这种现象不能作出任何解释,只是对时效现象最原始 The theory of aging of aluminum alloys comes first of all from the practice of alloy production and use. Without mass production, research and use of aluminum alloys, it is not possible to understand their variation over time. The earliest discovery of human aging phenomenon of aluminum alloy is the increase of hardness and strength of hard aluminum after quenching at room temperature. However, at that time, no explanation could be given for this phenomenon, only the most primitive phenomenon of limitation