随着飞行器关键技术的发展,高空高速成为当今世界先进飞行器研制的方向,飞行器要实现高空高速,提高推重比是关键。与其它金属材料相比,铝合金的密度小、塑性高,具有优良的电、热性能,表面有致密的氧化膜保护,抗腐蚀性能良好,因此成为飞行器设计实现高空高速的首选金属材料之一。 With the development of the key technologies of the aircraft, the high-altitude high-speed becomes the direction of the development of advanced aircraft in the world today. It is the key to realize the high-altitude and high-speed aircraft and to improve the thrust-to-weight ratio. Compared with other metal materials, the aluminum alloy has the advantages of low density, high plasticity, excellent electric and thermal properties, dense oxide film protection on the surface, and good corrosion resistance, thus becoming one of the preferred metal materials for aircraft design to achieve high altitude and high speed .