Investigation of solidification mechanism and microstructure of semi-solid as cast A380 part with swarf additions injected by diecast machine

Subject Areas :

Hooman Hadian ¹ , Mohsen Haddad sabzvar ² , Mohammad Mazinani ³

1 - Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University, Mashhad, Iran
2 - Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University, Mashhad, Iran
3 - Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University, Mashhad, Iran

Received: 2018-09-02 Accepted : 2019-08-06 Published : 2019-10-23

Keywords: micro structure, Semi-solid casting, solid fraction, swarf, solidification,

Abstract :

Nowadays, the production of industrial components by semi-solid methods is considered as a new method. These methods are time consumable due to slurry preparation process, leading to the development of methods that allow the creation of non-dendritic structures in the shortest possible time. For example, the method of enthalpy exchange Material (EEM) is one of the most common processes that results from the proximity of two materials with high and low enthalpy. In this research, the effect of adding swarf on the structure of die casting parts has been studied on aluminum alloy A380 and the possibility of structural changes in different temperature conditions has been investigated. The microstructure of the parts has changed from dendrites to globular and the microstructure consists mainly of alpha phase, eutectic and intermetallic compounds. SEM results showed that the distribution of copper and iron elements is in grain boundaries of aluminum alpha particles. Also, the solid weight fraction was calculated using the thermal analyze results and confirmed by microscopic images.

References:

[1]       خدائی، و ن. رهرام، "بررسی اثر دانسیته فوم و ضخامت پوشان بر الگوی جریان و برخی پارامترها در ریخته گری فومی"، فرآیندهای نوین در مهندسی مواد، 4، 2010.

 

[2]     T. Motegi, F. Tanabe & E. Sugiura, “Continuous casting of semisolid aluminium alloysˮ, Materials Science Forum: Trans Tech Publ, pp. 203-208, 2002.

 

[3]     M. Payandeh, M. H. Sabzevar, A E. Jarfors & M. Wessén, “Solidification and re-melting phenomena during the slurry preparation stage using the RheoMetalTM processˮ Jönköping University, School of Engineering, 2016.

 

[4]     P. Giordano & G. Chiarmetta, “Thixo and rheo casting: comparison on a high production volume component, Proceedings of the 7th S2P Advanced Semi-solid Processing of Alloys and Compositesˮ, ed Tsutsui, Kiuchi, Ichikawa, Tsukuba, Japan, 2002.

 

[5]     S. Nourouzi, M. Bakhshi- Juybari, A. kolahdooz & S. J. Hosseinipour, “Effect of temperature on the microstructure of semi-solid casting in cooling slope methodˮ, Aerospace Mechanics Journal, Vol. 9, 2013.

 

[6]     J. Campbell, “Complete casting handbook: metal casting processes, metallurgyˮ, Techniques and Design, Butterworth-Heinemann: Butterworth-Heinemann, 2015.

 

[7]       ا. کلاهدوز و م. موسوی، "بهینه سازی تغییرات ریزساختاری و خواص مکانیکی آلیاژ آلومینیم A360 تولید شده به روش ریخته گری نیمه جامد، فصلنامه علمی پژوهشی مهندسی مکانیک جامدات، 8، 1394.

 

[8]     Metals hand book, metallography and microstructures, ASM. USA: ASM, Vol. 9, 1998.

 

[9]     P. Marchwica, Microstructual and Thermal Analysis of Aluminum-Silicon and Magnesium-Aluminum Alloys Subjected to High Cooling Rates, 2012.

 

[10] E. Tzimas & A. Zavaliangos, “Evaluation of volume fraction of solid in alloys formed by semisolid processingˮ, Journal of Materials Science, Vol. 35, 2000.

 

[11] A. H. Ahmad,S. Naher & D. Brabazon, “Thermal profiles and fraction solid of aluminium 7075 at different cooling rate conditionsˮ, Key Engineering Materials: Trans Tech Publ, pp. 582-595, 2013.

 

[12] W. Kurz & D. J. Fisher, “Fundamentals of solidification, trans tech publications Aedermannsdorfˮ, Switzerland: Trans Tech Publications Aedermannsdorf, Switzerland, 1986.

 

[13] P. Orozco-González, M. Castro-Román, S. Maldonado-Ruíz, S. Haro-Rodríguez, F. Equihua-Guillén & R. Muñiz-Valdez, et al., “Nucleation of Fe-Rich intermetallic phases on α-Al2O3 oxide films in Al-Si alloysˮ, Journal of Minerals and Materials Characterization and Engineering, Vol. 3, 2015.

 

[14] G. Timelli & A. Fabrizi, “The effects of microstructure heterogeneities and casting defects on the mechanical properties of high-pressure die-cast AlSi9Cu3 (Fe) alloysˮ, Metallurgical and Materials Transactions A, Vol. 45, 2014.

 

[15] S. G. Irizalp & N. Saklakoglu, “Effect of Fe-rich intermetallics on the microstructure and mechanical properties of thixoformed A380 aluminum alloyˮ, Engineering Science and Technology, an International Journal, Vol. 17, 2014.

 

[16] J. A. Taylor, “Iron-containing intermetallic phases in Al-Si based casting alloysˮ, Procedia Materials Science, Vol. 1, 2012.

 

[17] H. Yang, S. Ji & Z. Fan, “Effect of heat treatment and Fe content on the microstructure and mechanical properties of die-cast Al–Si–Cu alloysˮ, Materials & Design, Vol. 85, 2015.

 

[18] A. Pola, M. Tocci & P. Kapranos, Microstructure and Properties of Semi-Solid Aluminum Alloys: A Literature Review, Metals, Vol. 8, 2018.

 

[19] M. Zamani, Al-Si Cast Alloys-Microstructure and Mechanical Properties at Ambient and Elevated Temperatures: Jönköping University, School of Engineering, 2001.

 

[20] R. Trivedi & W. Kurz, “Microstructure selection in eutectic alloy systemsˮ, Solidification processing of eutectic alloys, 1988.