采用DSC、金相、扫描电镜及能谱分析、 X射线衍射相分析等方法, 研究了7050合金Φ 200 mm半连续铸锭的结晶相及其在470 ℃均匀化处理过程的变化规律.结果表明: 7050合金半连续铸锭中存在大量非平衡凝固共晶体, 其过烧温度为477 ℃, 共晶体中的非基体共晶相为MgZn2型晶体结构的含AlZnMgCu元素的非平衡第二相; 在均匀化处理过程中, 该非平衡凝固共晶体不仅向合金基体溶解还转变成Al2CuMg(S相), S相在该合金中的熔化温度为490 ℃左右; 在470 ℃均匀化处理时, 半连续铸锭中含Zn结晶相于12 h前全部消失, 其中部分形成S相, 但在470 ℃均匀化处理时, S相不能完全溶入合金基体.铸锭中还存在少量的块状Al7Cu2Fe相, 该相在均匀化处理过程中基本保持不变.
参考文献
| [1] | 刘静安;周昆 .航空航天用铝合金材料的开发与应用趋势[J].铝加工,1997,20(06):51. |
| [2] | Xie F Y;Yan X Y;Ding L;Zhang F Chen S L Chu M G Chang Y A .A study of microstructure and microsegregation of aluminum 7050 alloy[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2003,355:144. |
| [3] | Mondolfo L F.Aluminum Alloys:Structure and Properties[M].London/Boston:Butter Worth Publication,1976:842. |
| [4] | U.TENZLER;E.CYRENER;G.TEMPUS .EXPERIMENTAL RESULTS ON PHASE DISSOLUTION AND HOMOGENIZATION IN CONTINUOUSLY CAST AlZnMgCU ALLOYS[J].Aluminium,1999(6):524-530. |
| [5] | Robson JD. .Optimizing the homogenization of zirconium containing commercial aluminium alloys using a novel process model[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):219-229. |
| [6] | Sachs G;Van Horn K R.Practical Metallurgy[M].Ohio:ASM,1944:46. |
| [7] | Polmear I J.Light Alloys[M].London:Edward Aronld,1981:51. |
| [8] | 左玉波,王爽,张海涛,刘晓涛,崔建忠.超高强铝合金中的结晶相及其控制[J].有色矿冶,2005(02):29-32. |
| [9] | 陈康华,刘红卫,刘允中.升温固溶对Al-Zn-Mg-Cu合金组织与力学性能的影响[J].中南工业大学学报(自然科学版),2000(04):339-341. |
| [10] | Dumont D.;Deschamps A.;Brechet Y. .On the relationship between microstructure, strength and toughness in AA7050 aluminum alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):326-336. |
| [11] | Hahn G T;Rosenfield A R .Metallurgical factors affecting fracture toughness of aluminum[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1975,6A:653. |
| [12] | 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. |
| [13] | Mondal C;Mukhopadhyay AK .On the nature of T(Al2Mg3Zn3) and S(Al2CuMg) phases present in as-cast and annealed 7055 aluminum alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2005(1/2):367-376. |
| [14] | 孙凤仙,高凤华,李念奎,田妮,赵刚.Al-6.1Zn-2.6Mg-1.6Cu超高强铝合金铸锭均匀化处理研究[J].轻合金加工技术,2007(01):16-19,52. |
| [15] | Fan X G;Jiang D M;Meng Q C;Zhong L .The microstructural evolution of an Al-Zn-Mg-Cu alloy during homogenization[J].Materials Letters,2006,60:1475. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%