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为了满足人们对材料日益增长的需要,Martin Marietta实验室研究出一种Weldalite合金和一种XD工艺。 1.Weldalite合金 铝合金在航空航天结构上的应用已60年了。运载火箭则多用2000或7000系铝合金。例如,外部油箱选用了2219铝合金,为了适应市场竞争,相应地发展了Al—Li合金并取得重要进展。因为将百分之几的锂加入铝中能显著提高合金的性能。2029系列Al—Li合金(Al—2.7Cu—2.4 Li—0.12Zr),其强度和韧性可与7075—T6铝合金相比,而且比后者轻8％,刚性更好。对于飞机结构用的Al—Li合金,大部分工作集中在板材的研制上。这些薄板是由紧固件或粘接剂连接而不用焊接。但宇宙飞船低温油箱用
To meet the growing need for materials, Martin Marietta Laboratories has developed a Weldalite alloy and an XD process. 1.Weldalite alloy aluminum alloy in the aerospace structure has been 60 years. Launch vehicle is more than 2000 or 7000 series aluminum alloy. For example, 2219 aluminum alloy is used for external fuel tank. In order to meet market competition, Al-Li alloy has been developed correspondingly and significant progress has been made. Because a few percent of lithium added to aluminum can significantly improve the performance of the alloy. 2029 series Al-Li alloy (Al-2.7Cu-2.4 Li-0.12Zr), its strength and toughness compared with the 7075-T6 aluminum alloy, and the latter 8% lighter, better rigidity. For the aircraft structure Al-Li alloy, most of the work focused on the development of the plate. These sheets are connected by fasteners or adhesives without welding. But spacecraft low temperature fuel tank