中南大学学报（自然科学版）2018，Vol.49Issue(4)：794-801,8.DOI:10.11817/j.issn.1672-7207.2018.04.004
时效处理对新型超高强Al-Cu-Li-X合金薄板的 力学性能和微观组织的影响
Effect of aging treatment on mechanical properties and microstructures of super-high strength Al-Cu-Li-X alloy
摘要
Abstract
The effect of aging treatment on the mechanical properties and microstructure of a novel super-high strength Al-Cu-Li-X alloy sheet with 2 mm thickness was investigated through tensile test and transmission electron microscopy (TEM). The results show that the alloy with T8 temper possesses higher strength and better plasticity than that with T6 temper. The aging precipitates include a large number of T1 phases,considerable θ′ phases,some δ′ phases and tiny S' phases. Pre-deformation before artificial aging restrains the formation of δ′ and S' phases, and promotes the precipitation of the T1 and θ′ phases. However,this promotion effectiveness on θ′ phases is less than that on T1 phases. At 6%?8% pre-deformation, the T8-aged alloy can obtain an excellent combination of strength and elongation. As 8% pre-deformation is supplied, the aged alloy possesses a peak tensile strength of 616 MPa and elongation of 12%.关键词
铝锂合金/热处理/强度/微观组织Key words
Al-Li alloy/heat treatment/strength/microstructure分类
矿业与冶金引用本文复制引用
汪洁霞,刘晴,李劲风,陈永来,张绪虎,许秀芝,郑子樵..时效处理对新型超高强Al-Cu-Li-X合金薄板的 力学性能和微观组织的影响[J].中南大学学报（自然科学版）,2018,49(4):794-801,8.基金项目
国家高技术研究发展计划(863计划)项目(2013AA032401)(Project(2013AA032401) supported by the National High-tech Research and Development Program (863 Program) of China) （863计划）
