摘要
本工作在5083铝合金Al-5Mg-0.5Mn中复合添加0.24%(质量分数)Zr和不同含量的Er制备了Al-5Mg-0.5Mn-0.24Zr-x Er合金,并对其进行320℃×20 h+450℃×20 h双级均匀化退火,研究不同Er含量与0.24%Zr复合添加对其组织及力学性能的影响规律以及Al 3Er的演变过程,借助TEM和元素的面扫分析手段探讨了Er元素的分布特征。研究结果表明,当Er含量为0.42%时,均匀化退火前Al-5Mg-0.5Mn-0.24Zr-x Er合金的最大显微硬度、抗拉强度和延伸率分别为77.6HV、232.8 MPa和15.3%;经过320℃×20 h+450℃×20 h均匀化退火后,合金的显微硬度、抗拉强度和延伸率分别为86.1HV、262.4 MPa和13.3%。随着Er含量在0.068%~0.52%区间增大,合金中形成的(Al,Mg,Mn,Er,Zr)复合白色相不断增多,其尺寸也不断增大,从球状、小块状及长条状向粗大鱼骨状转变;经过320℃×20 h+450℃×20 h的均匀化退火后,上述白色相逐渐扩散溶解,粗大鱼骨状基本消失,转变成小球状及小长条状,弥散分布在合金中。均匀化退火前,Er、Mg元素经常“相伴偏聚”,Er主要以Al(Er x Mg 1-x)粗大复合相的形式存在;均匀化退火后,合金中析出了5~25 nm的Al 3Er粒子,其与基体形成了基本完全共格的关系,而10~30 nm的Al 3(Er,Zr)粒子则均匀分布于基体中,进一步提高了合金的强度。
Based on the main alloy elements of 5083,Er and 0.24wt%Zr were added into Al-5Mg-0.5Mn and double-stage homogenization annealing was carried out at 320℃×20 h+450℃×20 for the new alloy.The effects of combining adding different Er and 0.24wt%Zr into Al-5Mg-0.5Mn on the structure and mechanical properties and the microstructure evolution of Al 3Er were investigated.Also the distribution characteristic of Er was discussed by TEM and surface scan analysis.The results showed that when Er content was 0.42wt%before the homogenized annealing,the maximum microhardness,tensile strength and elongation of the alloys are 77.6HV,232.8 MPa and 15.3%,respectively.After homo-genization annealing at 320℃×20 h+450℃×20 h,the microhardness,tensile strength and elongation of the alloys are 86.1HV,262.4 MPa and 13.3%,respectively.When the Er content increased from 0.068wt%to 0.52wt%,the amount of white composite phases formed and increased with the increase of Er content.Also the size of the white phases increases,and the shape changed from spherical,small and long strips to coarse fish bones.After homogenization annealing at 320℃×20 h+450℃×20 h,the white phases gradually diffused and dissolved,and the coarse fishbone phases disappeared substantially,which transformed into small spherical and small strips.Before homogenization annealing,Er and Mg elements often“segregate together”and Er mainly exists in the form of coarse Al(Er x Mg 1-x).After homogenization annealing,Al 3Er particles of 5—25 nm precipitate and the particles basically conform to the matrix.Also Al 3(Er,Zr)particles of 10—30 nm precipitate.They both distribute evenly in the alloy and further improved the strength of the alloy.
作者
丁俊
赵艳君
李志飞
庞兴志
唐鹏
胡治流
DING Jun;ZHAO Yanjun;LI Zhifei;PANG Xingzhi;TANG Peng;HU Zhiliu(The College of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Guangxi University,Nanning 530004,China;Center of Ecological Collaborative Innovation for Aluminum Industry in Guangxi,Nanning 530004,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第18期18086-18092,共7页
Materials Reports
基金
广西创新驱动项目(桂科AA17202011-1)
广西自然科学基金(2018GXNSFAA050048,2017GXNSFAA198271)
广西有色金属及特色材料加工重点实验室项目(GXYSSF1809)。
