Convection in Containerless Processing

• DOI: 10.1196/annals.1324.038
• Publication Date: 2005-01-11T06:28:05Z
• Authors: ROBERT W. HYERS; DOUGLAS M. MATSON; KENNETH F. KELTON; JAN R. ROGERS
• Keywords: Titanium; Hot Temperature; Models, Statistical; Time Factors; Viscosity; Weightlessness; Physics; Temperature; 02 engineering and technology; 7. Clean energy; electrostatic levitation; Zinc; Nickel; electromagnetic levitation; Thermodynamics; Stress, Mechanical; quasicrystals; stainless steel; 0210 nano-technology; Electromagnetic Phenomena; convection; Software; containerless processing

A bstract : Different containerless processing techniques have different strengths and weaknesses. Applying more than one technique allows various parts of a problem to be solved separately. For two research projects, on phase selection in steels the other nucleation growth quasicrystals, combination experiments using electrostatic levitation (ESL) electromagnetic (EML) is appropriate. In both experiments, convection an important variable. The convective conditions achievable with each method are compared for very materials: low‐viscosity, high‐temperature stainless steel, high‐viscosity, low‐temperature quasicrystal‐forming alloy. It clear that complementary when parameter explored experiments. number reasons, including sample size, temperature, reactivity, direct measurement velocity not feasible. Therefore, we must rely computation estimate these These models essential part almost any microgravity investigation. methods employed results obtained projects observation dendrite evolution steel ternary alloy rapid solidification (LODESTARS) quasicrystalline undercooled alloys space investigation (QUASI) explained. image