Experimental work was undertaken to investigate the effect of rotation speed on the solidification microstructure of AZ91D alloy using a twin-screw slurry maker. Then numerical simulation was used to investigate the effect of rotation speed on the flow filed and temperature field of the melt. It was found that increasing the rotation speed could give rise to substantial grain refinement, which can be attributed to the increase of effective nucleation rate caused by the extremely uniform temperature and dispersing any potential clusters of nucleation agents in the bulk liquid under dispersive mixing.
参考文献
| [1] | Flemings M.C .Behavior of metal alloys in the semisolid state[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1991,22(05):957. |
| [2] | Kirkwood D.H .Semisolid metal processing[J].International Materials Reviews,1994,39(05):173. |
| [3] | Z. Fan .Semisolid metal processing[J].International Materials Reviews,2002(2):49-85. |
| [4] | Weimin Mao;Hai Lin;Yuelong Bai;Songfu Gao .New method for the preparation of semi-solid AlSi7Mg alloy slurry[J].Journal of University of Science and Technology Beijing,2007(1):56-60. |
| [5] | Kaufman H;Mundl A;Uggowitzer P;Potzinger R,and Ishibashi N .An uptate on the new rheocasting development work for al and mg alloys[J].Die Castings Engineer,2002,46(04):16. |
| [6] | Wannasin J;Martinez RA;Flemings MC .Grain refinement of an aluminum alloy by introducing gas bubbles during solidification[J].Scripta materialia,2006(2):115-118. |
| [7] | Ji S;Fan Z;Bevis M.J .Semi-solid processing of engineering alloys by a twin-screw rheomoulding process[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2001,299(1-2):210. |
| [8] | Z. Fan;G. Liu .Solidification behaviour of AZ91D alloy under intensive forced convection in the RDC process[J].Acta materialia,2005(16):4345-4357. |
| [9] | Fan Z;Liu G;Hitchcock M .Solidification behaviour under intensive forced convection[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2005,413:229. |
| [10] | Bakalis S;Karwe MV .Measuring of velocity distributions in the nip region of a co-rotating twin-screw extruder.[J].Food and Bioproducts Processing. Transactions of the Institution of Chemical Engineers, Part C,1999(C3):205-212. |
| [11] | Serafim Bakalis;Mukund V. Karwe .Velocity distributions and volume flow rates in the nip and translational regions of a co-rotating, self-wiping, twin-screw extruder[J].Journal of Food Engineering,2002(4):273-282. |
| [12] | F.Bertrand;F.Thibault;P.A.Tanguy;L.Delamare .Adaptive finite element simulations of fluid flow in twin-screw extruders[J].Computers & Chemical Engineering: An International Journal of Computer Applications in Chemical Engineering,2003(4):491-500. |
| [13] | Z. Fan;S. Ji;J. Zhang .Processing of immiscible metallic alloys by rheomixing process[J].Materials Science and Technology: MST: A publication of the Institute of Metals,2001(7):837-842. |
| [14] | Yerramilli L;Karwe M.V .Velocity distributions and mixing in the translational region of a kneading section in a co-rotating twin-screw extruder[J].Food and Bioproduets Processing,2004,82(01):5. |
| [15] | Chenxu Yu;Sundaram Gunasekaran .Modeling of melt conveying and heat transfer in a twin-screw cheese stretcher[J].Journal of Food Engineering,2005(2):245-252. |
| [16] | Z. Fan;Y. Wang;M. Xia .Enhanced heterogeneous nucleation in AZ91D alloy by intensive melt shearing[J].Acta materialia,2009(16):4891-4901. |
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%