Paper Titles
Effect of Ultrasonic Vibration on the Dispersion of Carbon Nano-Fibre Reinforcement through Semi-Solid AZ91D Magnesium Alloy
p.392
Joining Metals by Combining Mechanical Stirring and Thermomechanical Treatment to Form a Globular Weld Structure
p.397
Application of the Continuous Rheoconversion Process (CRP) to Low Temperature HPDC-Part I: Microstructure
p.402
Formation of Bulk Metal Ingots with Homogeneous Fine-Grained Structure Using Novel Semisolid Casting Technique
p.406
Research on the Composite Slurry Preparation and Rheocasting of Aluminum Alloy
p.410
Effect of Roll Gap Geometry on the Evolution of Strain States and Textures during Asymmetrical Rolling in AA 1050
p.417
Hybrid Preform for Metal Matrix Composites: Processing and Characterization
p.421
Continuous Fabrication of Sound Semi-Solid Slurry for Rheoforming
p.425
Parameter Estimation for Semi-Solid Aluminum Alloys Using Transient Experiments
p.429

Research on the Composite Slurry Preparation and Rheocasting of Aluminum Alloy

Article Preview

Abstract:

The study on new rheoforming technologies of semisolid alloys has recently been one main subject interesting many professors, experts and industrials, and so many new methods about preparing semisolid alloy slurry and rheoforming process have been put forward. The semisolid slurry of AlSi7Mg alloy was prepared by being poured at a low superheat and stirred by an electromagnetic field at a low power for a short time, and then the slurry was further soaked for proper time and finally rheoformed into a key-shaped die cavity in this paper. The influence of slurry temperature, injection specific pressure and injection speed on the rheoforming process was also studied. The experimental results show that if AlSi7Mg alloy melt is poured at 630°C or 650°C and meanwhile stirred by an electromagnetic field at a low power for a short time, the most primary α-Al grains solidified in the slurry are spherical and only a few are rosette-like. If the slurry after made is then soaked in the liquidus-solidus range for some time, the ripening of primary α-Al grains is developed further and they become more spherical and larger. The experimental results also show that the slurry temperature, injection pressure and speed have a great influence on filling ability. The higher the slurry temperature, injection pressure and speed, the higher the slurry filling ability, and the shorter the core distance from the ingate, the more easily the die cavity is filled. With the given key-shaped casting, if only the slurry temperature should be equal to or more than 585,, or the injection pressure is equal to or more than 20 MPa, or the injection speed should be equal to or more than 1.73m/s, the key-shaped die cavity can be filled completely. The microstructural distribution in the casting is very homogeneous and it shows that the slurry prepared by the new method is very suitable for rheoforming and helpful to obtaining high quality castings.

You might also be interested in these eBooks
Semi-Solid Processing of Alloys and Composites View Preview

Info:

Periodical:

Solid State Phenomena (Volumes 116-117)

Pages:

410-416

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.116-117.410

Citation:

Cite this paper

Online since:

October 2006

Authors:

Wei Min Mao, Yue Long Bai, Song Fu Gao, Guo Xing Tang

Keywords:

AlSi7Mg Alloy, Electromagnetic Stirring (EMS), Microstructure, rheoforming, Semi-Solid

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] M.C. Flemings: Metall Trans. Vol. 22A (1991), p.957.

Google Scholar

[2] S.P. Midson: In: Chiarmetta G L and Rosso M. Proc. of the 6th Int. Conf. on Semi-Solid Processing of Alloys and Composites, Turin, Italy, Sept 27-29 (2000), Materials Science and Chemical Engineering Department, Politecnico DI Torino, p.251.

Google Scholar

[3] T. Kaneuchi, R. Shibata and M. Ozawa: In: Tsutsui Y, Kiuchi M and Ichikawa K. Proc. of the 7th Int. Conf. on Semi-Solid Processing of Alloys and Composites, Tsukuba JAPAN, Sept 25-27 (2002).

Google Scholar

[4] N. Wang, Hs. Peng and K. K. Wang: In: Kirkwood D H and Kapranos P. Proc of the 4th Int. Conf. on Semi-Solid Processing of Alloys and Composites, University of Sheffield, England, June 19-21 (1996).

Google Scholar

[5] N. Wang and K.K. Wang: In: Dardano C, Francisco M and Proud J. Proc. of the 5th Int. Conf. on Semi-Solid Processing of Alloys and Composites, Golden, Colorado, June 23-25 (1998), Colorado School of Mines, p.521.

Google Scholar

[6] S. Ji, Z. Fan and M. J. Bevis: Mater Sci & Eng, Vol. 299A (2001), p.210.

Google Scholar

[7] H. Kaufmann, A. Mundi, P. J. Uggowitzer, P. J. Uggowitzer and N. Ishibashi: Die Casting Engineer, Vol. 46 (2002), p.16.

Google Scholar

[8] J. Yueko: Die Casting Engineer, Vol. 46 (2002), p.20.

Google Scholar

[9] Mao Weimin, Zhao Aimin, Cui Chenglin: Method and equipment for preparation of semisolid metal slurry or continuous cast billet. China Patent, 00109540. 4 (2000).

Google Scholar

[10] W.M. Mao, A.M. Zhao C.L. Cui, F. Sun, C. L. Zheng and X.Y. Zhong: Acta Metallurgica Sinica, Vol. 36 (2000), p.539 (in Chinese).

Google Scholar

[11] D. Liu, J.Z. Cui and K. L. Xia: Journal of Northeastern University Natural Science. Vol. 20 (1999), p.173 (in Chinese).

Google Scholar