CREEP－RUPTURE BEHAVIOR OF Al－Li－Cu－Mg－Zr ALLOY IN THE TEMPERATURE RANGE OF 463～563K＋
来源期刊：中南大学学报(英文版)1995年第1期
论文作者：Zheng Ziqiao Liang Shuquan Liu Minggui Yin Dengfeng
文章页码：16 - 20
Key words：creep; microstructure; ageing; Al-Li alloys
Abstract: The creep-rupture behavior of an ageing hardened Al-Li-Cu -Mg-Zr alloy has been investigated at 463～563 K. Results indicate that creep rupture life is associated with the coarsening of precipitates,the precipitation of equilibrium phases and the formation of precipitate free zones at the grain boundaries during creep testing. A small amount of cold working before ageing tends to increase the creep life, which is attributed to a large quantity of homogeneously distributed S'' precipitates present in the tested alloy. It is suggested that subgrain boundaries stabilized by S'' precipitates appear to be less effective as sinks for dislocations,so that the onset of rapid dynamic recovery delays and the resistance against creep failure increases.
Zheng Ziqiao; Liang Shuquan; Liu Minggui; Yin Dengfeng
(Department of Materials Science and Engineering, Central South University of Technology, Changsha, 410083, China)
Abstract:The creep-rupture behavior of an ageing hardened Al-Li-Cu -Mg-Zr alloy has been investigated at 463～563 K. Results indicate that creep rupture life is associated with the coarsening of precipitates,the precipitation of equilibrium phases and the formation of precipitate free zones at the grain boundaries during creep testing. A small amount of cold working before ageing tends to increase the creep life, which is attributed to a large quantity of homogeneously distributed S'' precipitates present in the tested alloy. It is suggested that subgrain boundaries stabilized by S'' precipitates appear to be less effective as sinks for dislocations,so that the onset of rapid dynamic recovery delays and the resistance against creep failure increases.
Key words:creep; microstructure; ageing; Al-Li alloys
