M5锆合金是法国法马通公司开发研制的新一代燃料包壳材料,现已用作第3代改进型燃料组件AFA-3G燃料棒的包壳。核燃料包壳管在正常服役工况下,经受强烈的中子辐照,同时管内外均承受交变应力和温度作用,以及电厂定期开停堆,使得包壳经常产生周期性塑性变形,因此,锆合金包壳的疲劳 M5 zirconium alloy is a new generation of fuel cladding material developed by france masson corporation and is now used as the cladding of AFA-3G fuel rod of the 3rd generation improved fuel assembly. Under normal service conditions, the nuclear fuel cladding tube is subjected to intense neutron irradiation while being subjected to alternating stress and temperature inside and outside the tube, and the plant is periodically opened and deactivated, so that the cladding often produces periodic plastic deformation. Therefore, Zirconium alloy cladding fatigue