一、前 言 铝合金制造起落架,可以减轻飞讥重量,容易加工,且经济,又安全可靠,因而国外广泛使用。 三二零厂设计的某机前起落架选用了LC9合金,开创了国内铝合金起落架的先例。 LC9属于Al-Zn-Mg-Cu系合金,是铝合金中强度最高的,但该合金在一般人工时效状态下,高向具有应力腐蚀倾向,在过去的使用中,国内外都曾出现过应力腐蚀断裂的问题。为了解决这个问题,国外发展了7075-T73状 First, the preface Aluminum alloy landing gear, you can reduce the flying mute weight, easy processing, and economical, safe and reliable, and thus widely used abroad. The design of a two-zero factory engine landing gear selected LC9 alloy landing gear, creating a precedent for domestic aluminum landing gear. LC9 belongs to the Al-Zn-Mg-Cu alloy, which is the highest strength in aluminum alloys. However, the alloy tends to have a stress corrosion tendency under normal artificial aging conditions. In the past, LC9 has been stressed at home and abroad Corrosion cracking problem. In order to solve this problem, the foreign developed 7075-T73-like