AA7150铝合金高应变速率热变形过程中显微组织动态演变表征（英文）
发布时间：2018-11-20 15:35
【摘要】：在温度分别为300°C和450°C条件下对AA7150铝合金进行高应变速率(10 s~(-1))热压缩实验。结合差热分析和透射电子显微镜对其不同应变下热变形过程流变行为、亚结构演变及析出相形貌和空间分布进行了系统研究。研究结果表明:AA7150铝合金热变形过程发生了流变软化,在300°C条件下主要软化机制是动态回复,而450°C条件下为连续动态再结晶;合金热变形过程中η相(300°C)及Al_3Zr粒子(450°C)随应变的增加分布不均匀;T相中的铜含量随温度升高而增加且有从T相向S相转变的趋势,且随变形量的增加逐渐呈线性排列;显微组织还显示了动态析出及粒子诱发形核再结晶直接相关的形貌特征。
[Abstract]:The high strain rate (10s ~ (-1) thermal compression experiments of AA7150 aluminum alloy were carried out at temperatures of 300 掳C and 450 掳C, respectively. The rheological behavior, the evolution of substructure and the morphology and spatial distribution of precipitates in different strain were studied by differential thermal analysis (DTA) and transmission electron microscope (TEM). The results show that rheological softening occurs in the hot deformation process of AA7150 aluminum alloy, the main softening mechanism is dynamic recovery at 300 掳C and continuous dynamic recrystallization at 450 掳C. During hot deformation, 畏 phase (300 掳C) and Al_3Zr particle (450 掳C) distributed unevenly with the increase of strain. The copper content in T phase increases with the increase of temperature and tends to change from T phase to S phase, and it is linearly arranged with the increase of deformation, and the microstructure also shows the morphology characteristics of dynamic precipitation and particle induced nucleation and recrystallization.
【作者单位】： 湖南大学材料科学与工程学院;Department
【基金】：Project(20130161110007) supported by the Doctoral Program of the Ministry of Education,China Project(CX2013B128) supported by Hunan Provincial Innovation Foundation for Postgraduate,China Project(201306130021) supported by the Chinese Scholarship Council
【分类号】：TG146.21
[Abstract]:The high strain rate (10s ~ (-1) thermal compression experiments of AA7150 aluminum alloy were carried out at temperatures of 300 掳C and 450 掳C, respectively. The rheological behavior, the evolution of substructure and the morphology and spatial distribution of precipitates in different strain were studied by differential thermal analysis (DTA) and transmission electron microscope (TEM). The results show that rheological softening occurs in the hot deformation process of AA7150 aluminum alloy, the main softening mechanism is dynamic recovery at 300 掳C and continuous dynamic recrystallization at 450 掳C. During hot deformation, 畏 phase (300 掳C) and Al_3Zr particle (450 掳C) distributed unevenly with the increase of strain. The copper content in T phase increases with the increase of temperature and tends to change from T phase to S phase, and it is linearly arranged with the increase of deformation, and the microstructure also shows the morphology characteristics of dynamic precipitation and particle induced nucleation and recrystallization.
【作者单位】： 湖南大学材料科学与工程学院;Department
【基金】：Project(20130161110007) supported by the Doctoral Program of the Ministry of Education,China Project(CX2013B128) supported by Hunan Provincial Innovation Foundation for Postgraduate,China Project(201306130021) supported by the Chinese Scholarship Council
【分类号】：TG146.21
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