Ni-base Single Crystals

Nickel base single crystals are among the major materials achievements of the twentieth century. Among all structural materials, nickel-base alloys are unique for their ability to operate at 90% of their melting point with substantial mechanical loads in chemically severe environments. Design advances in these materials have been synonymous with advances in the performance and efficiency in aircraft and power-generation turbines, rocket engines, and nuclear power plants. Our research focuses on the design of new alloys that are compatible with advanced thermal barrier coating systems, development of new single crystal solidification processes that can produce physically large single crystals for power generation systems, development of rejuvenation approaches to extend the lifetimes of these high value materials and for predicting their behavior during processing and in service environments.

Researchers

Tresa Pollock

Research interests include the mechanical and environmental performance of materials in extreme environments, unique high temperature materials processing paths, ultrafast laser-material interactions, alloy design and 3-D materials characterization.

Jean-Charles Stinville

  • Deformation behavior and damage of polycrystalline and monocrystalline materials in relation with microstructure and/or microstructure evolution induced by heat/conversion treatment
  • Effect of microstructure and mechanical properties changes on deformation behavior and damage of metallic materials

Alice Cervellon

- Very high cycle fatigue of Ni- and CoNi-based superalloys in monocrystalline and polycristalline version

- Effect of microstructure on mechanical properties and damage of metallic materials

Brent Goodlet

Applications of Resonant Ultrasound Spectroscopy (RUS) to characterize materials and nondestructively evaluate damage.

Jeff Rossin

Work to predict the microstructure, fabrication conditions, and consequent integrity of additively manufactured (AM) high temperature (nickel-base) alloys using non-destructive examination (NDE) techniques such as Resonant Ultrasound Spectroscopy (RUS). Destructive techniques such as electron backscatter diffraction, three-dimensional tomography, and transmission electron microscopy are utilized to validate RUS and finite element modeling frameworks. These NDE frameworks contribute to cost effective and efficient screening of AM components.