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Ashutosh Jena,Niladri Naskar,Nishant Kumar,Manas Paliwal 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
A wedge casting experiment was performed for ternary Mg–6 wt% Sn–1 wt% Al alloy to obtain solidified microstructure ina wide range of cooling rate (5–150 K/s). As-cast microstructural features such as secondary dendrite arm spacing and totalsecond phase fraction were determined as a function of cooling rate. Furthermore, the as-cast samples were solution treatedat 743 K and 793 K for 1, 6, 12 and 24 h to examine the variation of total secondary phases with respect to temperatureand time. The experimental data revealed the dissolution of total secondary phases within 1 h and 12–24 h at 793 K and743 K respectively. Solidification simulations incorporating solute back diffusion, secondary arm coarsening and dendritetip undercooling were performed for accurate analysis of the experimental results. The study also presents a diffusion-basedhomogenization model to investigate the microstructural changes in the ternary alloy during solution treatment. In thismodel, simultaneous dissolution of Mg2Snand Mg17Al12phases along with Sn and Al redistribution in the hcp Mg matrixwas incorporated. The effect of temperature and time was ascertained on the solute distribution and secondary phases dissolution. The modelling results were compared with the homogenized microstructural features.
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Prosanta Biswas,Surajit Patra,Himadri Roy,Chandra Sekhar Tiwary,Manas Paliwal,Manas Kumar Mondal 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
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.
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