摘要
利用TEM、维氏硬度计、电子万能试验机、涡流导电仪等手段研究了不同的二级时效温度对7050铝合金组织和性能的影响。结果表明,随着二级时效温度的提高,合金的硬度、强度均呈现单调下降的势态,且下降幅度逐渐增大;合金的电导率变化趋势刚好相反,呈现出单调上升的势态;从组织形貌来看,二级时效温度的提高使晶内析出相由G.P.区、η′相不断转化为η相,同时η相不断粗化;晶界上析出了η相,形成了60nm^100nm的PFZ,随着二级时效温度的升高,η相不断粗化,间距也不断增大;综合来看,7050铝合金在经过(475±3)℃×40min的固溶处理和110℃×6h+170℃×20h的双级时效处理后获得了更优异的综合性能。
The effects of different secondary aging temperatures on the microstructure and properties of 7050 aluminum alloy were studied by means of TEM,Vickers hardness tester,electronic universal testing machine and eddy current conductivity tester.The results show that,the hardness and strength of 7050 alloy decrease monotonously with the increase of the secondary aging temperature,and the decreasing range increases gradually.The change trend of electrical conductivity of 7050 alloy is just opposite which shows a monotonic rising potential.From the view of microstructure,With the increase of the secondary aging temperature,the precipitated phase in the crystal is transformed from G.P.region andη′phase toηphase,and theηphase is coarsened continuously.Theηphase precipitated on the grain boundary and formed a PFZ of 60 nm^100 nm while theηphase coarsened and the spacing increased.In a word,7050 aluminum alloy obtains better comprehensive properties after solution at(475±3)℃×40 min and two-step aging at 110℃×6 h+170℃×20 h.
作者
陈庚
苗景国
方琴
彭显平
Chen Geng;Miao Jingguo;Fang Qin;Peng Xian Ping(Sichuan Engineering Technical College,Deyang,Sichuan,618000,China)
出处
《装备制造与教育》
2020年第3期44-46,75,共4页
Equipment Manufacturing and Education
基金
德阳市科技支撑计划项目(项目编号:2018SZY067)。
关键词
二级时效
温度
7050铝合金
secondary aging
temperature
7050 aluminum alloy
