A Researcher’s Guide to: Microgravity Materials Research

June 2025 Edition

Most materials are formed from a partially or totally fluid sample, and the transport of heat and mass from the fluid into the solid during solidification inherently influences the formation of the material and its resultant properties. The ISS provides a long-duration microgravity environment for conducting experiments that enables researchers to examine the effects of heat and mass transport on materials processes in the near-absence of gravity-driven forces. The microgravity environment greatly reduces buoyancy-driven convection, hydrostatic pressure, and sedimentation. It can also be advantageous for designing experiments with reduced container interactions. The reduction in these gravity-related sources of heat and mass transport may be taken advantage of to determine how material processes and microstructure formation are affected by gravity-driven and gravity independent sources of heat and mass transfer. 

Materials science experiments on the ISS have yielded broad and significant scientific advancements, including contributing to the development of improved mathematical models for predicting material properties during processing on Earth and enabling a better understanding of microstructure formation during solidification towards controlling the material properties of various alloys. 

This researcher’s guide provides information on the acceleration environment of the space station and describes facilities available for materials research. Examples of previous microgravity materials research and descriptions of planned research are also provided.

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