摘要
利用多向大变形锻造工业工艺和显微组织观察 ,研究了工业 70 75铝合金中细晶粒显微组织的演变。在工业生产条件下 ,70 75铝合金基体在锻造过程中可发生完全的动态再结晶 ,产生出平均尺寸小于 2μm的细小等轴再结晶晶粒结构 ,晶粒内包含高密度位错与弥散细小的第二相粒子缠结。锻件经 390℃～ 45 0℃退火 1h后 ,晶粒尺寸仍在 2μm～ 3μm左右 。
The fine grained structure involved in a commercial 7075 aluminum alloy was investigated by means of multi-directional and high-strain forging and microstructural observations. Under industrial conditions, the 7076 Al alloy matrix exhibits the microstructure of equiaxial grains with an average diameter of 2 mum by dynamic recrystallization during forging. These DRX grains contain high density dislocations tangled with fine second particles. The grain size of the sample annealed at 390 degreesC similar to 450 degreesC for 1 hour is still 2 mum similar to3 mum, which suggests that the DRX grain structures can exist stably during static annealing.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2001年第5期335-338,共4页
Rare Metal Materials and Engineering
基金
国家"973"资助项目 (G19990 6 490 8- 0 4
关键词
铝合金
多向大变形锻造
动态再结晶
细晶粒结构
退火
7075 aluminum alloy
multi-direction and hig strain forging
dynamic recrystallization
fine grained microstructure
