CAJ | 학술논문

通过模拟空问热循环试验,研究了热循环因素对5A06铝合金焊接接头断裂机理的影响.结果表明,热循环及外加载荷环境会造成5A06铝合金焊接接头断裂机理的改变,会在焊接接头的热影响Ⅸ处形成更多的损伤.这是由于焊接热影响叹中聚集、析出的第二相粒子的热膨胀系数与铝合金母材相差很大,热循环及外加载荷造成了基体与第二相之间的脱离,导致接头性能劣化和断裂机理的改变.
통과모의공문열순배시험,연구료열순배인소대5A06려합금한접접두단렬궤리적영향.결과표명,열순배급외가재하배경회조성5A06려합금한접접두단렬궤리적개변,회재한접접두적열영향Ⅸ처형성경다적손상.저시유우한접열영향우중취집、석출적제이상입자적열팽창계수여려합금모재상차흔대,열순배급외가재하조성료기체여제이상지간적탈리,도치접두성능열화화단렬궤리적개변.
Based on simulated aerospace thermal cycling test,the fracture mechanism of 5A06 AI ahoy welded joints was studied under the condition of external load and thermal cyclic load.The results show that the thermal cycle with external load call cause the change of fracture mechanism.It also can induce more severe damage in the welded joint than in the base 5A06 aluminium alloy.This iS because of the big difierence between the base aluminum alloy and the inclusions in the weld as well as the second phase particles in the heat affected zone.The thermal cycle with external load call induce the debonding between the base alloy and second phase panicles,which results in the performance deterioration and fracture mechanism change of the welded joint.