Open Journal Systems

Cooling Rate, Hardness and Microstructure of Aluminum Cast Alloys

Hasan Akhyar, Ahmad Farhan2

Abstract

This experiment investigated the cooling curve behavior, hardness and microstructure of two aluminum alloys produced by casting process. There are Al-1.37Zn-1.19Si and Al-1.66Si-1.35Zn derived from melting and alloying a pure aluminum with ADC12 (Al-Si) ingot. Cooling curve recorded from both those two alloys with pouring temperature at 710 oC and the mold temperature kept constant at 220 oC. The result shows, a freezing range of Al-1.37Zn-1.19Si alloy is 643–348 oC and Al-1.66Si-1.35Zn alloy is 621–401 oC. Then cooling rate obtained for Al-1.37Zn-1.19Si is 55.56 oC/S, and Al-1.66Si-1.35Zn is 30.09 oC/S. TThe higher hardness is 40.42 BHN at Al 1.66 Si-1.35Zn, while the lower value is 34.62 BHN on Al-1,37Zn-1,19Si alloy. The hardness value found higher when cooling rate is shorted. The number of silicon present on microstructure is highest in Al-1.37Zn-1.19Si alloy but the hardness value decreases. This is caused by the distribution of the silicon content in the alloy is irregular. It was found that the solidification rate had an effect on hardness, where the freezing rate obtained a high hardness value.


Keywords

Metal casting; metallurgy; cooling curve; cooling rate; aluminum alloy; hardness.

Full Text:

PDF

References

Wang, H.J., Xu, J., Kang, Y.L., Tang, M.O. and Zhang, Z.F. (2014) Effect of Al-5Ti-1B-1Re on the Microstructure and Hot Crack of As-Cast Al-Zn-Mg-Cu Alloy. Journal of Materials Engineering and Performance. 23(4):2014—1165.

Fang, H.C., Chao, H., Chen, K.H. (2014) Effect of Zr,Er and Cr additions on microstructures and properties of Al–Zn–Mg–Cu alloys. Materials Science & Engineering A, 610:10–16.

Kaiser, R., Williamson, K., O’brien, C. and Browne, D.J. (2013) Effects of Section Size, Surface Cooling Conditions, and Crucible Material on Microstructure and As-Cast Properties of Investment Cast Co-Cr Biomedical Alloy. Metallurgical and materials transactions A. 44A:2013—5333.

Kabir M.S., Ashrafi A.A., Minhaj T. I., Islam M.M. (2014) Effect of Foundry Variables on the Casting Quality of As-Cast LM25 Aluminum Alloy, International Journal of Engineering and Advance Technology, 3(6): 115-120.

Pang S., Wu G., Liu W., Zhang L., Zang Y., Conrad H., Ding W. (2015) Influence of pouring temperature on solidification behavior, microstructure and mechanical properties of sand-cast Mg−10Gd−3Y−0.4Zr alloy, Trans. Nonferrous Met. Soc. China, 25:363−374.

Amin K.M., Mufti N.A (2012) Investigating cooling curve profile and microstructure of a squeeze cast Al– 4%Cu alloy", Journal of Materials Processing Technology, 212:1631– 1639.

Akili C.E, Alami M., Bouatad A. (2014) Cooling Rate Effect Study on the Microstructure and Hardness of Hypereutectic Aluminum Al-18%Si Elaborated by V-process, International Journal of Engineering Trends and Technology, 7(2).

Akhyar H., Husaini, (2016) Study on Cooling Curve Behavior During Solidification and Investigation of Impact Strength and Hardness of Recycled Al–Zn Aluminum Alloy, International Journal of Metalcasting, DOI 10.1007/s40962-016-0024-8.

Pang, S., Wu, G., Liu, W., Sun, M., Zhang, Y., Liu, Z., Ding, W. (2013) Effect of cooling rate on the microstructure and mechanical properties of sand-casting Mg–10Gd–3Y–0.5Zr magnesium alloy. Materials Science & Engineering A, 562:152–160.

Sebaie, O.E., Samuel, A.M., Samuel, F.H., Doty, H.W. (2008) The effects of mischmetal, cooling rate and heat treatment on the hardness of A319.1, A356.2 and A413.1 Al–Si casting alloys. Materials Science and Engineering A 486: 241–252.

Dehnavi, M., Haddad-Sabzevar, M., Avazkonnadeh-Gharavol, M.H. (2015) Cooling Curve Analysis in Binary Al-Cu Alloys: Part II- Effect of Cooling Rate and Grain Refinement on The Thermal and Thermodynamic Characteristics, Metall. Mater. Eng. Vol 21 (3): 207-221.

Dehnavi, M., Kuhestani, F., Haddad-Sabzevar, M., (2015) Cooling Curve Analysis in Binary Al-Cu Alloys: Part I- Effect of Cooling Rate and Copper Content on The Eutectic Formation, Metall. Mater. Eng. Vol 21 (3): 195-205.

Ihsan-ul-haq, Shin, J., Lee, Z., (2004) Computer-Aided Cooling Curve Analysis of A356 Aluminum Alloy, METALS AND MATERIALS International, Vol. 10, No. 1 : 89-96.

Dai, W., Xue, S., Lou, J. Wang, S., (2012) Microstructure and Properties of 6061 Aluminum Alloy Brazing Joint with AlSiZn Filler Metal, Materials Transactions, Vol. 53(9): 1638-1643.

Maruyama, T., Kobayashi, T., Kano, M., (2006) A Spray Coating and Its Mechanical Properties of Al-Si-Zn Alloy Produced by the Spray Forming Process, Materials Transactions, Vol. 47(7): 1853-1858.

Dai, W., Xue, S., Ji, F., Lou, J., Sun, B., Wang, S., (2013) Brazing 6061 aluminum alloy with Al-Si-Zn filler metals containing Sr, International Journal of Minerals, Metallurgy and Materials, Vol. 20 (4): 365-369.

Akhyar, H., Farhan, A., (2016) Cooling Rate Investigation and the Influence of Pouring Temperature on Hardness Properties of As-Cast Aluminum Alloys, Proceedings of International Conference on Engineering and Science for Research and Development (ICESReD) 2016, October 25-26, 2016, Banda Aceh, Indonesia.

Akhyar, H., Malau, V., Suyitno, Iswanto, P.T., (2017) Hot tearing susceptibility of aluminum alloys using CRCM-Horizontal mold, Results in Physics, Vol. 7: 1030–1039.


DOI: http://dx.doi.org/10.18063/msmr.v2i1.354
(234 Abstract Views, 232 PDF Downloads)

Refbacks

  • There are currently no refbacks.


Copyright (c) 2018 Materials Science: Materials Review