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.
出处
《山东大学学报（工学版）》
CAS
北大核心
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)
