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The Influence of Selected Refining Methods of AlSi7Mg0.3 Silumin on its Quality Index

100%

Czekaj E. , Nykiel J. , Kwak Z. , Garbacz-Klempka A. , Nykiel M.

tom Vol. 18, iss. 2

72--78

The publication presents the comparison of selected refining methods (gaseous and/or flux) based on mechanical properties of the obtained secondary silumin EN AC-AlSi7Mg0.3 (in accordance to the European Standard PN-EN 1706:2011). The point of reference was a similar primary alloy produced using pure batch materials. The mechanical properties measured in room temperature were used to calculate the materials quality index. The research showed, that properly carried out refinement process of secondary (recycled) alloys can bring their quality indexes close to those of their primary materials. The goal was to assess the efficiency of selected refining methods when applied to the examined group of casting silumins, by measuring the basic mechanical properties (in room temperature) before and after refining. The practical aspect was to choose an effective (ecologically, technologically and economically) method of refining of secondary EN AC-AlSi7Mg0.3 alloy used to cast car rims for JN METAL company in Ostowiec Świętokrzyski (Poland).

Effect of specific surface fraction of interphase boundaries on mechanical properties of ceramic-metal composites, obtained by pressure infiltration

84%

Chabera P. , Boczkowska A. , Zych J. , Oziębło A. , Kurzydłowski K. J.

tom R. 11, nr 3

202-207

Ceramic-metal composites, obtained via pressure infiltration of porous ceramics Al2O3 by cast aluminium alloy EN AC-AlSi11 (AK11), were studied. As a result, composites of two interpenetrating phases are obtained. They are composed of 30 vol.% of ceramics. The pore sizes of the ceramic preforms varied from 150 to 500 μm. The results of the X-ray tomography proved very good infiltration of the pores by the metal. The residual porosity is approximately 9 vol. %. The obtained microstructure with percolation of the ceramic and metal phases gives the composites good mechanical properties together with the ability to absorb strain energy. Image analysis has been used to evaluate the specific surface fraction of the interphase boundaries (Sv). The presented results of the studies show the effect of the surface fraction of the interphase boundaries of ceramic-metals on the composite compressive strength, hardness and Young's modulus. In addition, the mechanical properties depend on the degree of infiltration. Compression tests for the obtained composites were carried out, and Young's modulus was measured by application of the DIC (Digital Image Correlation) method. Moreover, Brinell hardness tests were performed. The composites microstructure was studied using scanning electron microscopy (SEM). SEM investigations showed that the pores are almost fully filled by the aluminium alloy. The obtained results show that the infiltration method can be used to fabricate composites with percolation of the microstructure. However, the research is at its early stage and will be continued in the sphere of the characteristics of interphase boundaries.

Przedmiotem badań były kompozyty ceramika-metal, otrzymywane w wyniku infiltracji porowatej ceramiki Al2O3 odlewniczym stopem EN AC-AlSi11 (AK11). W wyniku infiltracji ceramicznych kształtek powstają kompozyty o dwóch wzajemnie przenikających się fazach, przy czym udział objętościowy ceramiki stanowi ok. 30% objętości kompozytu. Makrostruktura kompozytu o perkolacji faz ceramiki i metalu nadaje mu zdolność do absorbowania energii. Przeprowadzone badania wykazały wpływ udziału granic międzyfazowych ceramika-metal na właściwości mechaniczne kompozytów. Poprzez zmianę wielkości porów w kształtkach ceramicznych infiltrowanych odlewniczymi stopami aluminium, zachowując przy tym stały udział porowatości otwartej, sterowano względną powierzchnią granic rozdziału ceramika-metal. Na wytrzymałość na ściskanie, twardość i moduł Younga oprócz udziału granic międzyfazowych wpływ ma także stopień przeinfiltrowania ceramiki metalem. Badania te mają charakter wstępny i będą kontynuowane w zakresie charakteryzacji granic rozdziału. Uzyskane wyniki dają możliwość uzyskania tą drogą nowych materiałów o właściwościach łączących pozytywne cechy składników kompozytu, w którym osnową jest tworzywo ceramiczne, a fazą wypełniającą pory metal

Al-Si and Al-Si-Mg Cast Alloys Shrinkage Porosity Estimation

84%

Samavedam S. , Sundarrajan S.

2016

tom Vol. 16, iss. 1

61--68

US A356 and US 413 cast aluminium alloys shrinkage characteristic have been discussed in the present study. Specific volume reduction leads to shrinkage in castings and it can be envisaged as a casting defect. Finite difference based casting process simulation software has been used to study the shrinkage characteristic and it is quantified using mathematical formulae. The three dimensional model of the shrinkage defect has been constructed using CAD application software. Shrinkage characteristic has also been quantified through experimental validation studies and compared well with casting process simulation. Shrinkage characteristic study and control is essential for producing defect free castings. Influence of casting shape on the shrinkage characteristic has been studied in this paper.