预处理对喷射沉积Al-Cu-Li合金中Al3Zr粒子析出及再结晶行为的影响
Effect of pretreatment on precipitation of Al3Zr dispersoids and recrystallization behavior of spray deposited Al-Cu-Li alloy
汪成 1张劲2
作者信息
- 1. Light Alloy Research Institute,Central South University,Changsha 410083,China
- 2. Light Alloy Research Institute,Central South University,Changsha 410083,China;State Key Laboratory of High Performance and Complex Manufacturing(Central South University),Changsha 410083,China
- 折叠
摘要
本文为探究如何调控喷射沉积Al-Cu-Li合金中Al3Zr粒子的析出以及其析出机制,通过扫描电镜、透射电镜和电子背散射衍射研究了预处理对喷射沉积Al-Cu-Li合金中Al3Zr粒子的析出行为及其对再结晶的影响.研究结果表明,喷射沉积Al-Cu-Li合金中Al3Zr粒子存在分布不均匀,其粒子数量密度在Zr原子过饱和度高的晶内更高,在过饱和度低的晶界附近更低;晶界附近和晶内均存在局部无沉淀析出带,且晶界附近存在少量粒子线性团簇.在均匀化过程中Zr原子与位错攀移之间发生交互作用使得Al3Zr粒子析出.在均匀化前热变形预处理增加了基体中位错数量进而促进了Al3Zr粒子析出,改善了粒子分布,抑制了局部无沉淀析出带.相比于(573 K/12 h)退火预处理和673 K下压缩10％预处理,673 K下压缩30％预处理试样中Al3Zr粒子密度更高,分布更均匀,尺寸更小.经过热压缩和固溶处理后,3种热压缩试样大角度晶界占比分别为30.3％、21.6％和17.3％.本研究将为喷射沉积Al-Cu-Li合金的研发提供依据.
Abstract
The effects of pretreatment on the precipitation behavior of Al3Zr precipitates and the recrystallization of spray-deposited Al-Cu-Li alloy were investigated by scanning electron microscopy, transmission electron microscopy and electron backscatter diffraction. It was found that the distribution of Al3Zr dispersoids in the spray-deposited Al-Cu-Li alloy was heterogeneous. The dispersoid number density is higher in the intragranular and lower near the grain boundaries. The precipitation-free zones are distributed in the intragranular and near the grain boundaries, while a small number of linear clusters are distributed near the grain boundaries. During the homogenization process, the interaction between Zr atoms and dislocation climb caused the precipitation of Al3Zr dispersoids by fast pipe diffusion. Pretreatment of thermal deformation before homogenization increased the number of dislocations in the matrix, promoted the precipitation of Al3Zr dispersoids, inhibited local PFZs, improved the particle distribution, and uniformly distributed Al3Zr dispersoids. After compression by 30％ at 673 K, compared with annealing at 573 K for 12 h and compression by 10％ at 673 K, the Al3Zr dispersoids have higher number density, more uniform distribution, and smaller size. After hot compression and solution treatment, the percentages of HAGBs in the three hot compression samples were 30.3％, 21.6％, and 17.3％, respectively.
关键词
Al-Cu-Li合金/喷射沉积/预处理/Al3Zr粒子/再结晶Key words
Al-Cu-Li alloy/spray-deposition/pretreatment/Al3Zr dispersoids/recrystallization引用本文复制引用
基金项目
National Key R&D Program of China(2019YFA0708802)
National Key R&D Program of China(2020YFA0711104)
National Natural Science Foundation of China(U21B6004)
Major Project of Scientific Innovation of Hunan Province,China(2021GK1040)
出版年
2023
NETL
NSTL
万方数据