Striking differences in the solidification textures of a nickel based alloy owing to changes in laser scanning pattern during additive manufacturing are examined based on theory and experimental data. Understanding and controlling texture are important because it affects mechanical and chemical properties. Solidification texture depends on the local heat flow directions and competitive grain gr...

2014 We report a large decrease in small-angle-neutron scattering (SANS) after relaxationannealing below Tg in glassy Pd80Si12Ge8 ribbons. We had previously reported here on the SANS in this alloy and its anisotropy which we attributed to defect orientations induced by the shearing action of the substrate during rapid solidification. We now attribute the decrease in the anisotropic SANS to the ...

A creative technique of in-situ focused ion beam (FIB) extraction was introduced to prepare a gas atomized rapidly solidified hypereutectic Al-Si single particle's cross-section for High Resolution Transmission Electron Microscopy (HRTEM) analysis. This preparation technique may be employed to characterize very inimitable samples that are abnormally wrought or intricate to prepare through tradi...

Presented work shows the results of DSC measurement for six Sn based solders. The alloys Sn96Ag4, Sn99Cu1, Sn97Cu3, Sn96.5Ag3Cu0.5, Sn95.5Ag3.8Cu0.7 and Sn63Pb37 were studied in the temperature range from room temperature up to 400◦C. The transformation temperatures for melting as well as for solidification were influenced by the composition and thermal history of the alloys. The thermal histor...

Electron beam welds between dissimilar stainless steels with different solidification modes were studied with a view to elucidating the role of nucleation, cooling rate and direction of dendrite growth on the tendency towards metastable phase solidification. The results are compared with the solidification behaviour of levitation melted samples. It is demonstrated that with careful design, stai...

Storing of available energy for later use is a necessity in the present world, one such method is using Phase Change Materials (PCMs). PCMs need a heat transfer medium to transfer the energy from the source to the PCM. In this present work spherical balls are used to store the PCM and water is used as a heat transfer fluid. Paraffin wax (PW) and Palmitic acid (PA) and (4060% PW-PA) eutectic mix...

Two high-strength low-alloyed steels alloyed with various Nb contents were prepared using continuous casting (CC) technology. In the round Steel 30Nb CC billet, it was segregation of C and in central equiaxed zone that promoted precipitation primary NbC carbides at grain boundaries. After processing into seamless tubes, micron-sized located middle bands, surrounded by many nano-sized formed dur...

In typical solidification processes the flow of molten metal is usually regarded as an unavoidable phenomenon potentially affecting the morphology of dendritic growth. Fundamental understanding of such flow is thus important for predicting and controlling solidification microstructures. This paper presents numerical simulations on the evolution of dendritic microstructures with melt convection....

A comprehensive methodology that takes into account alloy solidification, shrinkage-driven interdendritic fluid flow, hydrogen precipitation, and porosity evolution has been developed for the prediction of microporosity fraction in aluminum A356 alloy castings. The mathematical models presented are implemented in a computational framework consistent with those of commercial casting codes, allow...

In this paper, a multi-scale analysis scheme for solidification based on two-scale computational homogenization is discussed. Solidification problems involve evolution of surfaces coupled with flux jump boundary conditions across interfaces. We provide consistent macro-micro transition and averaging rules based on Hill’s macrohomogeneity condition. The overall macro-scale behavior is analyzed w...