利用光学显微镜、X射线衍射仪和透射电镜,研究了在不同电流和频率作用下,半连铸d100 mm高强高韧Al合金铸锭组织结构的变化.结果表明:在电磁场频率为25 Hz时,当电流从60 A增大到100 A时,电流越大,晶粒细化越明显;在电流为100 A时,晶粒细化的最佳频率为25 Hz;与常规铸锭相比,随电流增大,铸锭内沿[311]方向产生的织构逐渐消失,并且铸锭边缘和中心部位的点阵常数逐渐趋于一致,这表明溶质元素的分布更加均匀;在电流和频率分别为100 A和25 Hz时,晶界附近无析出带宽度变窄,约为100 nm.此时,无论是在晶内还是沿晶界,析出相的尺寸明显减小,并且有亚稳相,形态近似为颗粒状.
参考文献
| [1] | 董杰 .超高强铝合金低频电磁半连续铸造工艺及理论研究[D].沈阳:东北大学,2004. |
| [2] | Vives C .Effects of forced electromagnetic vibrations during the solidification of aluminum alloys ( Ⅱ )-solidification in the presence of collinear variable and stationary magnetic fields[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1996,7B:457-464. |
| [3] | Vives C .Electromagnetic refining of aluminum alloys by the CREM process ( Ⅰ )-working principle and metallurgical results[J].Metallurgical and Materials Transactions B:Process Metallurgy and Materials Processing Science,1989,20B:623-629. |
| [4] | 张勤,崔建忠,张北江.CREM法半连铸铝合金过程中最佳电磁场频率范围的确定[J].铸造,2004(01):41-45. |
| [5] | 张北江,崔建忠,路贵民,张勤,班春燕.电磁场频率对电磁铸造7075铝合金微观组织的影响[J].金属学报,2002(02):215-218. |
| [6] | 董杰,崔建忠,刘晓涛,赵志浩,包卫平.7A60超高强铝合金的低频电磁铸造（Ⅰ）--直径0.2m锭坯的铸态组织[J].中国有色金属学报,2003(06):1494-1499. |
| [7] | Beijiang ZHANG,Guimin LU,Jianzhong CUI.Effect of Electromagnetic Frequency on Microstructures of Continuous Casting Aluminum Alloys[J].材料科学技术学报(英文版),2002(05):401-403. |
| [8] | 董杰,崔建忠,刘晓涛,石路.低频电磁场参数对Al-10Zn-2.5Mg-2.5Cu-0.15Zr合金铸态组织和性能的影响[J].金属学报,2003(05):482-485. |
| [9] | W.J.Boettinger;S.R.Coriell .Solidification microstructures: recent developments, future directions[J].Acta materialia,2000(1):43-70. |
| [10] | 张勤,崔建忠.7075铝合金CREM法半连铸坯中溶质元素的宏观分布[J].金属学报,2003(12):1264-1268. |
| [11] | 张勤,崔建忠,路贵民,班春燕.电磁振荡法半连铸7075合金的微观组织及溶质元素分布[J].中国有色金属学报,2003(05):1184-1191. |
| [12] | ZHANG Bei-jiang;CUI Jian-zhong;LU Gui-min .Effect of electromagnetic field on macrosegregation of continuous casting 7075 aluminum alloy[J].Transa Nonferrous Met Soc China,2002,12(04):545-548. |
| [13] | 张北江,崔建忠,路贵民,张勤.外加电磁场对半连续铸造7075铝合金宏观偏析规律的影响[J].东北大学学报(自然科学版),2002(10):968-971. |
| [14] | Park J K;Ardell A J .Microstructures of the commercial 7075 Al alloy in the T651 and T7 tempers[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1983,14A:1957-1965. |
| [15] | Polmear I J.Light Alloys[M].New York:Edward Arnold,1989 |
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