采用电导率测试、室温拉伸性能测试、扫描电镜和透射电镜分析等方法，研究了不同的均匀化处理对铝锌镁钪合金组织和性能的影响。结果表明：铸态铝锌镁钪合金为过饱和固溶体，合金元素在晶界偏析，形成了富锌、镁的非平衡共晶T相和富铁、硅、锰的杂质相；当均匀化温度为350℃，过饱和基体析出平衡相η-MgZnz；随着均匀化温度的升高，非平衡共晶T相逐渐溶入基体，电导率下降，晶内析出大量Al3（Sc，Zr）粒子，合金的热加工性能提高；470℃×12h是试验合金较适宜的均匀化制度。
The effect of different homogenizing treatments on the microstrueture and properties of an Al-Zn- Mg-Sc alloy was a studied by conductivity measuring, room temperature tensile property testing, scanning electron microscopy and transmission electron microscopy, et al. The results show that the as-cast Al-Zn-Mg-Sc alloy was a supersaturated solid solution, and the alloy elements segregated along grain boundaries to form the non-equilibrium euteetie T phase rich in Zn and Mg and the impurities rich in Fe, Si and Mn. When the homogenizing temperature was 350 ℃, the equilibrium phase η-MgZn2 precipitated from the supersaturated matrix. With the increase of homogenizing temperature, non-equilibrium eutectic T phase gradually dissolved into the matrix, the conductivity decreased and a lot of Al3 （Sc, Zr） particles precipitated from the grains, and the thermal working property of the alloy increased. The fairly suitable homogenizing treatment precedure of the tested alloy was 470 ℃×12 h.
参考文献
| [1] | 贺永东,张新明,游江海.7A55合金均匀化处理[J].中国有色金属学报,2006(04):638-644. |
| [2] | 龚澎,张坤,戴圣龙,陆政.均匀化处理对新型Al-Zn-Mg-Cu铝合金组织及锻造性能的影响[J].材料工程,2010(02):74-77. |
| [3] | 王晨,周静,杨志峰,邹本杰.7050铝合金铸锭均匀化过程中相的转变[J].轻合金加工技术,2007(01):23-24,52. |
| [4] | 万里,邓运来,张云崖,张新明.Al-（7.8～9.0）Zn-1.6Mg-（1.0～2.2）Cu合金铸态及其均匀化组织[J].中国有色金属学报,2010(09):1698-1704. |
| [5] | 姜锋,韦莉莉,蹇海根,郑秀媛,黄宏锋,文康.航空用B93铝合金均匀化显微组织分析[J].航空材料学报,2010(02):1-6. |
| [6] | 邓英,何振波,尹志民,林森,石凯,黄继武.均匀化处理对铝-锌-镁-钪铸态合金硬度和电导率的影响[J].轻合金加工技术,2009(11):51-55. |
| [7] | 刘晓涛,董杰,崔建忠,赵刚.高强铝合金均匀化热处理[J].中国有色金属学报,2003(04):909-913. |
| [8] | 高凤华,李念奎,丛福官,田妮,赵刚.7050合金半连续铸锭中结晶相及其均匀化处理[J].稀有金属,2008(03):274-278. |
| [9] | 左玉波,董杰,崔建忠.铸造工艺参数对超高强铝合金低频电磁半连续铸锭微观组织的影响[J].铸造,2005(05):455-458. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%