采用透射电镜、X射线衍射、硬度测试等实验方法,研究了不同时效处理工艺对铸轧7050铝合金组织和性能的影响。结果表明：随着单级时效温度的升高,合金达到峰值硬度所需的时间缩短,合金的峰值硬度降低,晶内和晶界析出相也随温度的提高发生不同程度的长大;双级时效时,晶内有较多粗大的析出相,晶界析出相已不再连续且已经发生长大,晶界无沉淀带更加明显;回归再时效处理时,晶内析出相与单级时效时相比发生粗化,晶界上为断续的粗大长条状析出物,无偏析带加宽。
Microstructure and properties of cast-rolled 7050 aluminum alloy by different aging treatments were analyzed by means of transmission electron microscopy（TEM）,X-ray diffraction（XRD）,Vickers hardness test.Results show that for single aging treatment,when aging temperature increases,the time reaching to peak hardness decreases and the lower peak hardness is obtained,and the precipitates in grains and at grain boundary also grows up with increase of the temperature.For double aging treatment,many coarser precipitates in grains are observed and the precipitates are discontinously distributed at grain boundary,moreover,the precipitation free zones（PFZ）at grain boundary is more obvious.After retrogression and reaging（RRA）treatment,the precipitates in grains are coarser compared to those of single aging treatment,the discontinous strip precipitates from at grain boundary and PFZ becomes wider.
参考文献
| [1] | 丁培道,蒋斌,杨春楣,方亮.薄带连铸技术的发展现状与思考[J].中国有色金属学报,2004(z1):192-196. |
| [2] | 王祝堂.迈向新世纪的世界铝带坯铸轧[J].轻合金加工技术,2001(04):8-15. |
| [3] | 田福泉,李念奎,崔建忠.超高强铝合金强韧化的发展过程及方向[J].轻合金加工技术,2005(12):1-9. |
| [4] | 王洪,付高峰,孙继红,李兴杰,姜澜.超高强铝合金研究进展[J].材料导报,2006(02):58-60. |
| [5] | Sony R G;Zhang Q Z;Tseng M K .The application of artificial neural networks to the investigation of aging dynamics in 7175 aluminum alloys[J].Materials Science and Engineering C,1995,3:39-45. |
| [6] | Davies C H J .Ageing kinetics of a silicon carbide reinforced Al-Zn-Mg-Cu alloy[J].Acta Metallurgica Et Materialia,1994,42(01):309-318. |
| [7] | Uchida H.;Yoshida H. .Heat Treatment of Aluminium Alloys[J].住友軽金属技報,1997(2):177-190. |
| [8] | L. K. BERG;J. GJONNES;V. HANSEN .GP-ZONES IN Al-Zn-Mg ALLOYS AND THEIR ROLE IN ARTIFICIAL AGING[J].Acta materialia,2001(17):3443-3451. |
| [9] | 樊喜刚 .Al-Zn-Mg-Cu合金组织性能和断裂行为的研究[D].哈尔滨:哈尔滨工业大学,2007. |
| [10] | Kaibyshev R.;Sitdikov O.;Goloborodko A.;Sakai T. .Grain refinement in as-cast 7475 aluminum alloy under hot deformation[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):348-356. |
| [11] | 谷亦杰,林建国,张永刚,陈昌麒.回归再时效（RRA）处理对7050铝合金的影响[J].金属热处理,2001(01):31-35. |
| [12] | Danh D A .TEM study of microstructural changes during retrogression and reageing in aluminum[J].Metallurgical and Materials Transactions,1983,14(09):1843-1850. |
| [13] | 李杰 .热处理对7055合金组织和性能的影响[D].中南大学,2005. |
| [14] | 刘红卫,陈康华,刘允中.强化固溶对7075铝合金组织与性能的影响[J].金属热处理,2000(09):16-17. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%