A typical corrosion-resistant aluminum alloy. Its standard composition is 3.5% magnesium (Mg), 0.25% chromium (Cr), with small amounts of lead, manganese (Mn), silicon (Si), iron, titanium, etc. Soft alloys have good ductility and are used for plates, bars, and tubes. Most Al-Mg alloys have age hardening due to the precipitation of the β phase (Al 8 Mg 5 ), but since no precipitation is preferable for corrosion resistance, they are only solution-treated at about 350°C without aging treatment. Therefore, their strength is about 23 kg/mm 2. Other aluminum-based corrosion-resistant alloys include the Al-Mg-Si-based Aldry and Alzurr, and the Al-Mn-Cu-based Alumin. Al-Mg-Si-based alloys are age-hardened by the precipitation of magnesium silicide (Mg 2 Si). Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
代表的な耐食アルミニウム合金の一種。組成はマグネシウム Mg3.5%,クロム Cr0.25%,ほかに鉛,マンガン Mn,ケイ素 Si,鉄,チタンなどを少量含むものが基準で,軟質のものは展伸性がよく,板,棒,管として用いられる。だいたいは Al-Mg系の合金でβ相 ( Al8Mg5 ) の析出による時効硬化性があるが,耐食のためには析出のないほうがよいので,約 350℃で溶体化処理をするだけで時効処理は行わない。したがって強さも耐力 23 kg/mm2 程度である。他にアルミニウム系耐食合金として Al-Mg-Si系のアルドライおよびアルズール,Al-Mn-Cu系のアルミンなどがある。 Al-Mg-Si系合金ではケイ化マグネシウム Mg2Si の析出による時効硬化処理を行う。
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