Effect of Mn Addition on the Mechanical Properties of Al–12.6Si Alloy: Role of Al15(MnFe)3Si2 Intermetallic and Microstructure Modification

Prosanta Biswas; Surajit Patra; Himadri Roy; Chandra Sekhar Tiwary; Manas Paliwal; Manas Kumar Mondal

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자료유형: 학술저널

저자정보: Prosanta Biswas (National Institute of Technology Durgapur) Surajit Patra (National Institute of Technology Durgapur) Himadri Roy (CSIR-Central Mechanical Engineering Research Institute) Chandra Sekhar Tiwary (Indian Institute of Technology Kharagpur) Manas Paliwal (Indian Institute of Technology) Manas Kumar Mondal (National Institute of Technology Durgapur)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.6

발행연도: 2021.1

수록면: 1,713 - 1,727 (15page)

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Effect of manganese (Mn) addition (0.0, 1.0, 2.0 and 3 wt%) on the microstructural morphology, hardness, tensile propertiesand fracture behaviour of the gravity cast eutectic Al–12.6Si alloy has been studied through XRD analysis, chemical analysis,optical metallography, FESEM analysis, energy dispersive spectroscopy analysis, hardness test, tensile test and quantitativephase analysis. As-cast Al–12.6Si–0.0Mn alloy has a non-uniformly distributed coarser and irregular shape primary andeutectic silicon particles inside the α-Al phase, and both the Si phase have very sharp corners. Whereas, the 1 wt% Mn addedalloy has uniformly distributed fine eutectic and primary Si particles with blunt corners. Further, the addition of 1.0 wt% Mnforms very few (0.26 vol %) irregular shape Al15(MnFe)3Si2 intermetallic phase within the α-Al phase and eutectic Si phase. But, 2.0 wt% and 3 wt% Mn added alloy has an irregular shape coarse plate-like Al15(MnFe)3Si2 intermetallic phase besidesthe primary and eutectic Si phase. The bulk hardness of the Al–12.6Si alloy is increased with an increase in Mn concentrationas the harder Al15(MnFe)3Si2 intermetallic phase forms and both the Si phase morphology modify. The microhardness ofthe constituent phases also varies with the change in Mn concentration in the alloy. The Mn addition improved the ultimatetensile strength, yield strength, and elongation (%) of the alloy. However, fractographs reveal that the brittle mode of fracturehas been increased due to the presence of a higher volume of brittle Al15(MnFe)3Si2 intermetallic in 2.0 and 3.0% Mn alloy. On the other hand, the amount of brittle and cleavage fracture of Si particles decreased, and ductile fracture with dimplesformation increased in 1.0 wt%Mn added alloy.

#Al-Si-Mn alloy · Gravity casting · Microstructure · Hardness · Mechanical properties · Fracture behavior

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