Convective instabilities responsible for misoriented grains (freckle defects) in directionally solidified turbine airfoils are produced by variations in liquid–metal density with composition and temperature across the solidification zone. Here, fundamental properties of molten Ni-based alloys, required for modeling these instabilities, are calculated using ab initio molecular dynamics simulatio...

Abstract Multi-axial compression of the mushy zone occurs in various pressurized casting processes. Here, we present a drained triaxial apparatus for semi-solid alloys that allow liquid to be drawn into or expelled from sample response isotropic compression. The rig is used measure pressure-dependent flow stress and volumetric during isothermal globular Al-15 wt pct Cu at 70 85 vol solid. Analy...

While they are known for years to be the main source of equiaxed grains in metallurgical processes such as casting, melting and remelting phenomena currently receive an increasing attention owing developments additive manufacturing. In multiphase alloys, i.e. having a eutectic or peritectic microstructure, these still remain poorly documented. this work, solidification subsequent alloys have be...

In this work, we investigated the temperature dependence of kinematic viscosity multicomponent Fe72.5−xNixCu1Nb2Mo1.5Si14B9 melts with a Ni content up to 12.7 at. %. The peculiarities Ni-containing were explained by tendency atoms surface segregation. are concentrated near interfaces liquid and solid phases in mushy zone at stage melting restrain phase. With increasing content, Arrhenius type v...

We model buoyancy-driven convection with chimneys – channels of zero solid fraction – in a mushy layer formed during directional solidification of a binary alloy in two dimensions. A large suite of numerical simulations is combined with scaling analysis in order to study the parametric dependence of the flow. Stability boundaries are calculated for states of finite-amplitude convection with chi...

Abstract The properties of thermally sprayed coatings depend heavily on their microstructure. microstructure is determined by the dynamics impact droplets substrate surface and subsequent overlapping previously solidified deformed droplets. Substrate preparation prior to spraying ensures strong adhesion coating. This includes roughening preheating surface. In present study, smoothed particle hy...

An Analytical Study of Weakly Nonlinear Convection in a Horizontal Mushy Layer Prof. Dr. P. K. Srimani R & D Director (DSI), Former Chairman, B.U. Bangalore, Karnataka, INDIA Mr. R. Parthasarathi Prof. and HOD, Dept. Mathematics, Jain University – CMS, Bangalore, Karnataka, INDIA _______________________________________________________________________________________ Abstract: The present analyt...