摘要
采用喷射沉积技术制备Al-12Zn-2.4Mg-1.1Cu-0.2Zr-0.3Ni铝合金,利用电子拉伸机和透射电镜等手段,研究不同挤压比、不同固溶温度下合金经120、130℃时效处理后力学性能与微观组织之间的关系。结果表明:合金经480℃×2h+120℃×24 h固溶与时效处理后,合金抗拉强度达到830 MPa,延伸率保持在7.5%;加入微量锆和镍后PFZ区变宽,并且晶界上黑色链状物相(GBP)中有微量Ni元素存在,有球形Al3Zr相出现在PFZ区周围;纳米级含Zr、Ni相的"钉扎"细晶作用、η′相和PFZ联合作用促使材料具有良好的综合力学性能。
The Al-12Zn-2.4Mg-1.1Cu-0.2Zr-0.3Ni alloy was prepared by spray deposited technology. The microstructures of extruded and heat treated ultra-high strength aluminum alloy were investigated by transmission electron microscopy （TEM）, the tensile properties were tested after aging treatment at 120 ℃ and 130 ℃. The results show that the ultimate tensile strength can reach 832 MPa with elongation of 7.5% after 120 ℃×24 h aging treatment. The addition of Zr and Ni is favorable for precipition free zone （PFZ） width enlargement, and Ni phase particles precipitating in zone of grain boundary with slight fine A13Zr particles precipitating nearby the PFZ. As a result, the remarkable strengthening is predominantly atttibuted to the nanometer sized η′ phase, an enlarged-PFZ and pinning-effect by the nano-seale Zr-rieh and Ni-rich particles.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第3期41-44,共4页
Ordnance Material Science and Engineering
基金
内蒙古自治区自然科学基金研究项目(20080404MS0801)
内蒙古自治区高等学校科研项目(NJ06083)
关键词
超高强铝合金
锆镍元素
喷射沉积
力学性能
ultrahigh strength aluminum alloy
nickel element and zirconium element
spray deposition
mechanical properties
