预处理对2219铝合金蠕变行为及力学性能的影响

为了研究不同预变形量对铝合金蠕变行为及力学性能的影响规律。以2219铝合金为研究对象,在温度为175℃,180 MPa应力条件下,研究0~8%的预变形量对2219铝合金蠕变行为及力学性能的影响。结果表明:预变形处理的引入,材料的蠕变变形量和力学性能大幅度增加。当预变形处理量为1%时,其蠕变变形量较未处理时试样蠕变变形量增加了118%。而随着预变形量的继续增加,试样的的力学性能呈现快速下降的变化趋势。综合考虑蠕变变形量与力学性能时,最利于构件的蠕变时效成形的2219铝合金的预变形处理量为3%。

Effect of Pretreatment on Creep Behavior and Mechanical Properties of 2219 Aluminum Alloy

In order to study the effects of different pre-deformation on creep behavior and mechanical properties of aluminum alloy,the 2219 aluminum alloy was taken as example.Under condition of 175℃and 180 MPa,creep behavior and mechanical properties of 2219 aluminum alloys with 0 to 8%pre-deformation after creep aging were investigated.The results show that the creep deformation and mechanical properties of materials increase greatly with the introduction of pre-deformation treatment.When the pre-deformation treatment is 1%,the creep deformation of the sample increases by 118%compared with that of the untreated sample.However,as the amount of predeformation continues to increase,the mechanical properties of the sample decline rapidly.With comprehensive consideration of creep deformation and the mechanical property,the most favorable pre-stretching for creep aging forming of components is 3%.