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

中国有色金属学报(英文版), 2016, 26(1): 51-62. doi: 10.1016/S1003-6326(16)64087-6

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

1.湖南大学材料科学与工程学院,长沙410082;Department of Materials Science and Engineering,McMaster University,1280 Main Street West,Hamiltion,Ontario L8S 4L7,Canada

2.湖南大学材料科学与工程学院,长沙410082;湖南大学湖南省喷射沉积技术及应用重点实验室,长沙410082

3.湖南大学材料科学与工程学院,长沙,410082

4.湖南大学材料科学与工程学院,长沙410082;湖南大学湖南省喷射沉积技术及应用重点实验室,长沙410082

基金项目: Project(CX2013B128) supported by Hunan Provincial Innovation Foundation for Postgraduate, China Project(20130161110007) supported by the Doctoral Program of the Ministry of Education, China Project(201306130021) supported by the Chinese Scholarship Council

关键词： Al-Zn-Mg合金 , 热压缩 , 动态现象 , 显微组织

Characterization of dynamic microstructural evolution of AA7150 aluminum alloy at high strain rate during hot deformation

Keywords： Al-Zn-Mg alloy , hot compression , dynamic phenomena , microstructure

在温度分别为300℃和450℃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℃条件下主要软化机制是动态回复,而450℃条件下为连续动态再结晶;合金热变形过程中η相(300℃)及Al3Zr粒子(450℃)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.

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