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2021是阿尔卡公司为大型火箭液体燃料助推器结构和燃料箱而发展的高强度可焊铝合金。 2021是铝—铜系合金,具有复杂的化学成分,要求严格控制11种合金化元素。热处理和时效的2021的主要强化机理是铝—铜过渡相的沉淀,镉和锡促进了该相的成核。这种新的铝合金较目前用于空间飞行器燃料箱上的若干铝合金有许多优点。热处理和时效的2021具有2014—T6合金的强度和大致相同的低温韧性。但是2021合金更易于焊接和更能抗应力腐蚀裂纹。2021不论在高温,还是在低温都有较好的强度。当冷却到-233℃时,2021保持了室温塑性,强度提高了40％。在高温下2021具有相当于2219合金的强度。2021的焊接强度比2219的高,其抗焊接裂纹的性能非常好。
2021 is a high strength, weldable aluminum alloy developed by Alcatel for large rocket liquid fuel booster structures and fuel tanks. 2021 is an aluminum-copper alloy with a complex chemical composition that requires strict control of 11 alloying elements. The main strengthening mechanism of heat treatment and aging 2021 is the precipitation of an aluminum-copper transitional phase, and the cadmium and tin promote the nucleation of this phase. This new aluminum alloy offers many advantages over several aluminum alloys currently used in spacecraft fuel tanks. Heat treated and aged 2021 has the same strength and substantially the same low temperature toughness as the 2014-T6 alloy. However, the 2021 alloy is easier to weld and more resistant to stress corrosion cracking. 2021 has good strength both at high temperature and low temperature. When cooled to -233 ° C, 2021 maintains room-temperature plasticity with a 40% increase in strength. 2021 has the equivalent of 2219 alloy at high temperatures. The 2021 has a higher weld strength than 2219, and its resistance to weld cracking is very good.