1420铝锂合金超塑性行为  

Superplastic behavior of 1420Al-Li alloy

作　　者：郑路[1] 张艳苓[2] 王耀奇[2] 侯红亮[2] 范同祥[1] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240 [2]中国航空工业集团公司北京航空制造工程研究所,北京100024

出　　处：《山东大学学报（工学版）》2014年第3期90-94,共5页Journal of Shandong University（Engineering Science）

基　　金：国家重点基础研究发展计划资助项目(2011CB012800)

摘　　要：以1420铝锂合金作为实验材料,通过改变应变速率来探求最佳的超塑性变形条件,即延伸率大幅度提高和获得变形均匀的细小微观组织。研究发现当温度为480℃,应变速率为3×10-4s-1时可以获得最佳超塑性变形状态,此时延伸率δ=550%,流变应力σ=1.9 MPa。同时通过金相分析以及TEM微观组织观察发现,在此条件下的组织等轴性好同时晶粒分布细小均匀,出现了细小的再结晶亚晶粒,有助于超塑性变形的进行。1420Al-Li alloy was used to explore the best deformation results including high elongation, uniform, and fine-grain structure by changing deformation temperature and strain rate.The results showed that, on the condition of deflection temperature T =480 ℃ and strain rate .ε =3 ×10 -4 s -1 , 1420 Al-Li alloy showed good superplasticity, of which the maximum elongation δ =550% and the minimum flow stress σ=1.9 MPa.Furthermore, the grain micro-structure was isometric and fine after superplastic deformation through metallurgical analysis and TEM microstructure observation.Besides, the re-crystallization grains appeared which could promote the super-plastic deformation process during the deformation.

关 键 词：1420铝锂合金 超塑性变形 应变速率 延伸率 流变应力 再结晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]