CAJ | 학술논문

采用拉伸测试、维氏硬度测试和透射电镜分析等方法研究实验应力和时效时间对2524铝合金蠕变时效行为的影响.结果表明:时效时间和试验应力对材料的成形与微观组织均有较大的影响,应力越大、时间越长,蠕变行为越明显;在190℃温度下,试验应力为180 MPa,时效时间约为12 h时,材料的硬度和强度趋近于峰值;TEM 分析表明,合金板材强度和伸长率的差别主要由时效后强化相 S′相和 S″相的尺寸和分布密度决定;采用线性回归方法获得合金在190℃下稳态蠕变速率与实验应力的本构关系.
채용랍신측시、유씨경도측시화투사전경분석등방법연구실험응력화시효시간대2524려합금연변시효행위적영향.결과표명:시효시간화시험응력대재료적성형여미관조직균유교대적영향,응력월대、시간월장,연변행위월명현;재190℃온도하,시험응력위180 MPa,시효시간약위12 h시,재료적경도화강도추근우봉치;TEM 분석표명,합금판재강도화신장솔적차별주요유시효후강화상 S′상화 S″상적척촌화분포밀도결정;채용선성회귀방법획득합금재190℃하은태연변속솔여실험응력적본구관계.
@@@@The creep age forming effects of 2524 aluminum alloy at different stresses and aging times were investigated through tensile performance, Vickers hardness and TEM. The results show that the aging time and stress have great effect on not only creep behavior but also microstructure of 2524 aluminum alloy. And the creep behavior will become stronger with heavier stress and longer time. The hardness and strength of material will tend to be peak at 190 ℃ when the test-stress reaches 180 MPa and ageing time is 12 h. It can be concluded that the differences of strength and elongation of the alloy plate are determined by the size and distribution of S″and S′phase. Finally, the constitutive relationship between the steady creep rate and stress of 2524 aluminum alloy at 190℃is obtained by linear regression.