JMMCE  Vol.2 No.3 , May 2014
Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy
ABSTRACT
In this paper, the mechanical properties and microstructure of die cast aluminium A380 alloy casts produced under varying pressure was investigated experimentally and compared. The results obtained show better mechanical properties i.e. hardness, tensile strengths and impact strengths in the die cast A380 alloy sample that solidified at high pressure when pressure was regulated across five samples of the castings. The hardness of the die cast A380 samples that solidified under different applied pressures varied from 76 to 85 HRN. Also tensile strength, yield strength and elongation of the samples showed an increase with increased pressure. Also the results of SEM and metallography show that at high pressure, structural changes occurred as a fine microstructure was obtained with increase of pressure.

Cite this paper
Obiekea, K. , Aku, S. and Yawas, D. (2014) Effects of Pressure on the Mechanical Properties and Microstructure of Die Cast Aluminum A380 Alloy. Journal of Minerals and Materials Characterization and Engineering, 2, 248-258. doi: 10.4236/jmmce.2014.23029.
References
[1]   Doehler, H. (1951) Die Casting. McGraw Hill Book Company, New York.

[2]   Adler, L., Nagy, P.B., Rypien, D.V. and Rose, J.H. (1989) Ultrasonic Evaluation of Porosity in Aluminium Cast Materials. Ohio State University, Columbus.

[3]   Dahle, A.K., Arnberg, L. and Apelian, D. (1997) Burst Feeding and Its Role in Porosity Formation during Solidification of Aluminum Foundry Alloys. 101st Casting Congress, American Foundry Men’s Society, Seattle.

[4]   Matthew, S., Dargusch, A., Dourb, G., Schauer, C., Dinnis, C.M. and Savaged, G. (2006) The Influence of Pressure during Solidification of High Pressure Die Cast Aluminium Telecommunication Components. Journal of Materials Processing Technology, 180, 37-43.
http://dx.doi.org/10.1016/j.jmatprotec.2006.05.001

[5]   Zhu, J.D., Cockcroft, S.L. and Maijer, D.M. (2006) Modelling of Micro Porosity Formation in A356 Aluminium Alloy Casting. Metallurgical and Materials Transactions A, 37, 1075.

[6]   Zhang, M., Zhang, W.-W., Zhao, H.-D., Zhang, D.-T. and Li, Y.-Y. (2007) Effect of Pressure on Microstructures and Mechanical Properties of Al-Cu-Based Alloy Prepared by Squeeze Casting. Transactions of Nonferrous Metals Society of China, 17, 496-501. http://dx.doi.org/10.1016/S1003-6326(07)60122-8

[7]   Wei, Y.-H., Hou, L.-F., Yang, L.-J., Xu, B.-S., Kozuka, M. and Ichinose, H. (2009) Microstructure and Properties of Die Casting Components with Various Thickness Made of AZ91D Alloy. Journal of Materials Processing Technology, 209, 3278-3284.
http://dx.doi.org/10.1016/j.jmatprotec.2008.07.034

[8]   Chiang, K.-T., Liu, N.-M. and Tsai, T.-C. (2008) Modelling and Analysis of the Effect of Processing Parameters on the Performance Characteristics in the High Pressure Die Casting Process of Al-Sl Alloys. International Journal of Advanced Manufacturing Technology, 41, 1076-1084.
http://dx.doi.org/10.1007/s00170-008-1559-5

[9]   Li, R.-X., Li, R.-D., Bai, Y.-H., Qu, Y.D. and Yuan, X.-G. (2009) Effects of Specific Pressure on Microstructure and Mechanical Properties of Squeezed Casting ZA27 Alloy. Shenyang University of Technology, Shenyang.

[10]   Ambardar, R., Jayakumar, T., Pathak, S.D. and Prabhakar, O. (1996) Effect of Surface Roughness on Ultrasonic Echo Amplitude in Aluminium-Coper Alloy Castings. 14th World Conference on Non Destructive Testing, New Delhi, 2, 981-984.

[11]   Aweda, J.O. (2006) Temperature Distribution and Properties in Squeeze Casting of Aluminium. Ph.D. Thesis, University of Ilorin, Ilorin.

[12]   Doehler, H. (1910) Art of and Apparatus for Casting Fluid Metal. United States Patent 973,483, United States Patent and Trademark Office, Washington DC.

[13]   Duckett, G. (1988) Quality-Whose Definition? Foundry Trade Journal, 163, 660-661.

[14]   Xu, J.-P., Ji, W.-Z. and He, Z.-Q. (2005) Squeeze Casting of Zn-Al Alloy Gears with High Strength. Special Casting and Nonferrous Alloys, 25, 637-638.

[15]   Li, R.-D., Huang, Z.-P., Bai, Y.-H., Zhang, Q.-S. and Zhang, H.-F. (2003) Effect of Super-High Pressure on the Non-Equilibrium Solidified Microstructure and Mechanical Properties of ZA27 Alloy. Foundry, 52, 92-94.

[16]   Mikelonis, P.L. (1986) Foundry Technology. In: Walsh, L., Wurster, R. and Kimber, R.J., Eds., Quality Management Handbook, Marcel Dekker, New York, 753-790.

[17]   Sabau, A.S. and Vishvanathan, S. (2002) Micro Porosity Prediction in Aluminum Alloy Castings. Metallurgical and Materials Transactions B, 33, 243.

[18]   Hong, S.Z. and Zeng, Z.P. (2002) Effects of the Specific Pressure on Grain Size in Squeeze Casting. Special Casting and Nonferrous Alloy, 22, 26-27.

[19]   Watmough (1960) The Effects of 0, 10, 20 psi (0, 0.069, and 0.138 MPa) Pressure Levels on the X-Ray Soundness of Sand Cast Steel Bars.

 
 
Top