2219铝合金单轴拉/压蠕变时效行性行为研究

Uniaxial Tension/Compression Creep Behavior of 2219 Aluminum Alloy

为研究2219铝合金在蠕变时效成形过程中,不同应力状态(拉/压)对其蠕变行为的影响规律,采用室温拉伸的方法研究了165~185℃内单轴拉/压2219铝合金力学性能的变化。结果表明:最佳蠕变时效时间为11 h;在相同的时效制度下,拉/压应力蠕变变形量均随着温度的升高而增加,拉应力的蠕变变形量始终大于压应力的蠕变变形量;无论是拉/压应力蠕变时效还是无应力常规时效,其时效后的性能均随着温度的升高而降低,然而,拉应力时效后性能的下降幅度最为明显;最后,在时效温度为165℃时,不同应力状态下的各项性能指标均表现为最佳。

Effect of stress states(tension//compression)on creep aging behavior in the process of creep aging forming of 2219 aluminum alloy was studied. The mechanical properties of 2219 aluminum alloy under uniaxial tension/compression were investigated when ageing at 165 to 185℃ by room temperature tensile test. The results show that the optimal creep aging time is 11 h. Under the same aging regime,the creep deformation of tensile stress and compressive stress increases with the increase of temperature,and the creep deformation of tensile stress is always greater than that of compressive stress. Regardless of the creep aging under tensile/compressive stress or the conventional aging without stress,the aging properties decrease with the increase of temperature. However,the decrease of properties is most obvious after tensile stress aging. Finally,when the aging temperature is 165℃,all the performance indexes are the best under different stress states.