美国麦道公司生产的MD-11飞机是世界上第一架采用铝锂合金挤压件的航线客机。该公司要求美国铝公司(ALCOA)为MD-11提供铝锂合金地板梁挤压件。该计划包括生产第一批5架MD-11飞机用地板梁并于1990年提供使用。铝锂地板梁的使用将取代现用铝合金梁,由此可使每架MD-11飞机减轻重量145kg。为使铝锂合金具有飞机零件需要的最佳性 MD-11 aircraft produced by the United States McDonnell Douglas is the world’s first airline passenger aircraft with aluminum-lithium alloy extrusion. The company asked ALCOA to provide aluminum-lithium alloy floor beam extrusions for the MD-11. The plan included the production of the first five MD-11 aircraft floor beams and was introduced in 1990. The use of Al-Li floor beams will replace the existing aluminum beams, thereby reducing the weight of each MD-11 aircraft by 145 kg. Aluminum-lithium alloys have the optimality needed for aircraft parts