摘要
用喷射沉积方法制备了Al Li合金及其含0 5%Cu的改型合金,进行了挤压和时效处理,测定了不同状态下这两种合金的显微组织和室温拉伸性能。结果表明,喷射沉积状态的Al 3 8Li 1 0Mg 0 4Ge 0 2Zr合金具有等轴细晶组织,析出Al4Li9和δ AlLi相,时效后析出大量δ′ AlLi相;添加0 5%Cu使屈服强度提高30～48MPa,拉伸强度提高44MPa,性能提高的原因是Cu的固溶强化和Li在基体固溶度减少导致δ′相含量增加。
Al-Li alloy containing high content of Li and its modified alloy with 0.5% Cu are prepared by spray deposited processing, and then extruded and aged. Microstructure and tensile properties at room temperature are determined for the two alloys at different conditions. The results show that spray deposited Al-3.8Li-l.0Mg-0.4Ge-0.2Zr alloy possess a fine equiaxed microstructure and precipitates Al4Li9 and δ-AlLi phases. Large amounts of δ′-AlLi phases are formed after aging. The addition of 0.5% Cu to the alloy leads to an improvement of 30-48 MPa and 44 MPa for yield strength and ultimate tensile strength respectively. The reason of improvement is due to the solid-solution strengthening effect of Cu and the decrease of the solid solubility of Li in the matrix leading to the higher volume fraction of δ′ phases.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2004年第2期197-200,共4页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(59881005)资助项目
关键词
喷射沉积
AL-LI合金
时效
拉伸性能
Aluminum alloys
Copper
Lithium alloys
Microstructure
Modification
Spraying
Tensile properties
