通过电子背散射衍射(EBSD)、电子探针(EPMA)和透射电子显微镜(TEM)研究7085铝合金在温度573~723 K、变形速率0.01~10 s?1条件热压缩时的动态再结晶行为。结果表明，在高 Zener?Hollomon (Z)值时，动态回复是主要的软化机制；随着 Z 参数值降低，出现动态再结晶。在 ln Z=24.01(723 K，0.01 s?1)热压缩时，动态再结晶分数最高，为10.2%。EBSD 结果表明，再结晶晶粒出现在初始晶界附近，其取向与变形晶粒接近。应变诱发晶界迁移是最可能的动态再结晶机制。晶界附近的低密度 Al3Zr 弥散粒子有利于应变诱发晶界迁移的发生。
The dynamic recrystallization behavior of 7085 aluminum alloy during hot compression at various temperatures (573?723 K) and strain rates (0.01?10 s?1) was studied by electron back scattered diffraction (EBSD), electro-probe microanalyzer (EPMA) and transmission electron microscopy (TEM). It is shown that dynamic recovery is the dominant softening mechanism at high Zener?Hollomon (Z) values, and dynamic recrystallization tends to appear at low Z values. Hot compression with ln Z=24.01 (723 K, 0.01 s?1) gives rise to the highest fraction of recrystallization of 10.2%. EBSD results show that the recrystallized grains are present near the original grain boundaries and exhibit similar orientation to the deformed grain. Strain-induced boundary migration is likely the mechanism for dynamic recrystallization. The low density of Al3Zr dispersoids near grain boundaries can make contribution to strain-induced boundary migration.
参考文献
| [1] | S. Gourdet;F. Montheillet.Effects of dynamic grain boundary migration during the hot compression of high stacking fault energy metals[J].Acta materialia,200211(11):2801-2812. |
| [2] | M.R. Rokni;A. Zarei-Hanzaki;Ali A. Roostaei;H.R. Abedi.An investigation into the hot deformation characteristics of 7075 aluminum alloy[J].Materials & design,20114(4):2339-2344. |
| [3] | Lin, Y.;Liu, W.;Wang, L.;Lavernia, E.J..Ultra-fine grained structure in Al-Mg induced by discontinuous dynamic recrystallization under moderate straining[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2013:197-204. |
| [4] | 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,20031/2(1/2):348-356. |
| [5] | H.R. Rezaei Ashtiani;M.H. Parsa;H. Bisadi.Effects of initial grain size on hot deformation behavior of commercial pure aluminum[J].Materials & design,2012Dec.(Dec.):478-485. |
| [6] | Xuyue Yang;Hiromi Miura;Taku Sakai.Continuous dynamic recrystallization in a superplastic 7075 aluminum alloy[J].Materials transactions,200210(10):2400-2407. |
| [7] | James C. Williams;Edgar A. Starke Jr..Progress in structural materials for aerospace systems[J].Acta materialia,200319(19):5775-5799. |
| [8] | N.M. Han;X.M. Zhang;S.D. Liu.Effect of solution treatment on the strength and fracture toughness of aluminum alloy 7050[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,201110(10):4138-4145. |
| [9] | M. Bobby Kannan;V.S. Raja.Enhancing stress corrosion cracking resistance in Al-Zn-Mg-Cu-Zr alloy through inhibiting recrystallization[J].Engineering Fracture Mechanics,20102(2):249-256. |
| [10] | Shengdan Liu;Wenjun Liu;Yong Zhang;Xinming Zhang;Yunlai Deng.Effect of microstructure on the quench sensitivity of AlZnMgCu alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20101(1):53-61. |
| [11] | 吕新宇;郭二军;Paul ROMETSCH;王立娟.单级及双级均匀化处理工艺对AA7150合金Al3Zr弥散相析出的影响[J].中国有色金属学报（英文版）,2012(11):2645-2651. |
| [12] | 郑玉林;李承波;刘胜胆;邓运来;张新明.均匀化时间对7085铝合金淬火敏感性的影响[J].中国有色金属学报（英文版）,2014(7):2275-2281. |
| [13] | S. D. Liu;Y. B. Yuan;C. B. Li.Influence of Cooling Rate After Homogenization on Microstructure and Mechanical Properties of Aluminum Alloy 7050[J].Metals and Materials International,20124(4):679-683. |
| [14] | Yun-Lai Deng;Li Wan;YongZhang.Evolution of microstructures and textures of 7050 Al alloy hot-rolled plate during staged solution heat-treatments[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20101(1):88-94. |
| [15] | 张辉;金能萍;陈江华.Al-Zn-Mg-Cu-Zr铝合金的高温热压缩变形行为[J].中国有色金属学报（英文版）,2011(3):437-442. |
| [16] | Shengdan Liu;Jianghai You;Xinming Zhang;Yunlai Deng;Yubao Yuan.Influence of cooling rate after homogenization on the flow behavior of aluminum alloy 7050 under hot compression[J].Materials Science & Engineering. A, Structural Materials: Properties, Misrostructure and Processing,20104/5(4/5):1200-1205. |
| [17] | H. Mirzadeh;A. Najafizadeh.Prediction of the critical conditions for initiation of dynamic recrystallization[J].Materials & design,20103(3):1174-1179. |
| [18] | YUN-LAI DENG;YUN-YA ZHANG;LI WAN.Three-Stage Homogenization of Al-Zn-Mg-Cu Alloys Containing Trace Zr[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,20136(6):2470-2477. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%