鎂鋁合金是一種在鋁合金中加入鎂金屬的合金,在鋁合金編號中獲編53xx的號碼序列。鎂鋁合金的優點,在於它有跟鋼一樣的強度和硬度,但重量卻比鋼輕得多,跟塑膠很接近。因此,因其質量輕,具有良好熱傳導能力,故常用於需重視散熱的電子器材。它普遍用於手提電腦的外殼。
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