5A90铝锂合金超塑变形的局部应变及其对组织演变的影响  

Effect of Local Strain Distribution on Microstructural Evolution during Superplastic Deformation of 5A90 Al-Li ally

作　　者：李红萍[1,2,3] 杨栋 孙泉[1,2] 叶凌英 张新明 LI Hong-ping;YANG Dong;SUN Quan;YE Ling-ying;ZHANG Xin-ming(School of Materials Science and Engineering,Central South University,Changsha,410083;Key Laboratory of Nonferrous Metals Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083;Shanghai Aircraft Design and Research Institute of COMAC,Shanghai 200232,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083 [3]中国商飞上海飞机设计研究院,上海200232

出　　处：《铝加工》2020年第5期14-19,共6页Aluminium Fabrication

基　　金：国家重点研发计划资助项目(2016YFB0300901);国家自然科学基金资助项目(51205419)。

摘　　要：以超塑性5A90合金板材为对象,通过EBSD检测、金相观察等实验手段,研究其在超塑变形过程中沿标距长度方向局部应变的演变对晶粒形貌、空洞形貌的影响。结果表明:在试样标距内从断口至肩部,应变分布不均匀并呈梯度分布,靠近断口处的应变量最大;晶粒尺寸、空洞尺寸及体积分数随着局部应变量的上升而增加。Superplastic deformation of 5 A90 alloy was carried out to study the effect of local strain developed on the microstructural evolution along the gauge length of tensile specimen by using optical techniques and electron backscatter diffraction.The results showed that the strain distribution was found to be non-uniform with more deformation towards fracture tip and less towards the shoulder section of specimen.Grain size and the volume fraction of cavity increased with the increase of local strain.

关 键 词：5A90铝锂合金 超塑性 局部应变 空洞 

分 类 号：TG166.3[金属学及工艺—热处理]