Lab Highlight: Powder Metallurgy, Sintering, & Characterization of High-Temp Mo-Si-B Alloys

In the intensive Research Lab: Properties, Testing, and Analytics module, Master of Science in Materials Science (MSI) students at VGU engaged in a hands-on laboratory series focused on Powder Metallurgy—a vital manufacturing technology for producing components from high-melting-point materials.

The lab series tasked students with synthesizing and analyzing refractory Molybdenum-Silicon-Vanadium-Boron (Mo-V-Si-B) alloys, which are designed for extreme aerospace and turbine environments.

🔬 Sintering & Mechanical Alloying Process

Operating research-grade mechanical alloying equipment, students executed key steps in the powder metallurgy pipeline:

• Mechanical Alloying via Ball Milling: Preparing a high-purity Mo-V-Si-B powder mixture and milling specimens at varied intervals (1 hour, 2 hours, 5 hours, and 20 hours) to study particle refinement and lattice deformation.
• Particle Size Dynamic Light Scattering (DLS): Monitoring the systematic reduction in particle sizes and the development of high surface energies as a function of milling time.
• X-Ray Diffraction (XRD) Lattice Scans: Tracking phase transitions, lattice expansion, and the creation of supersaturated solid solutions due to intense mechanical forces.
• Morphology Mapping via SEM: Characterizing particle shape transitions—observing the formation of distinct lamellar (layered) microstructures during the initial 1–2 hours of milling.

!NOTEScientific Finding: Powder metallurgy allows us to engineer alloys far beyond their equilibrium limits. In this lab, XRD scans successfully proved the insertion of Vanadium into the Molybdenum lattice, while SEM microscopy confirmed optimal particle welding and mechanical consolidation during the early milling hours.

🚀 Equipping Future Advanced Metallurgy Experts

By analyzing their own XRD and SEM data, VGU students master advanced materials characterization and processing.

This practical training lays the groundwork for high-impact master's theses and prepares our graduates to enter specialized metallurgy, aerospace turbine R&D, and advanced additive manufacturing industries globally!