Mo-Si-B Alloy Formed by Optional Laser Melting Process.

Area of Science:

• Materials Science
• Metallurgy
• Additive Manufacturing

Background:

• Molybdenum-silicon-boron (Mo-Si-B) alloys are advanced materials with potential applications in high-temperature environments.
• Selective Laser Melting (SLM) is an additive manufacturing technique offering precise control over alloy composition and microstructure.

Purpose of the Study:

• To investigate the density and mechanical properties of Mo-Si-B alloys fabricated using SLM.
• To explore the influence of varying SLM process parameters and compositions on alloy performance.
• To characterize the microstructure of the resulting Mo-Si-B alloys.

Main Methods:

• Solid-solid doping using pure Mo, amorphous Si, and B powders.
• Selective Laser Melting (SLM) with controlled laser power, scanning speed, and scanning distance.
• Microstructural observation and density measurements of the fabricated alloys.

Main Results:

• The Mo4.5-Si2-B (at.%) alloy exhibited the highest forming rate under specific SLM conditions (250 W laser power, 500 mm/s scanning speed, 60 μm scanning distance, 120° rotating scan strategy).
• The highest achieved density for the Mo-Si-B alloy was 94.22% under these optimal conditions.
• Microstructural analysis was performed to correlate processing parameters with material properties.

Conclusions:

• Optimized SLM parameters and composition are crucial for achieving high density and forming rates in Mo-Si-B alloys.
• The study demonstrates the feasibility of producing dense Mo-Si-B alloys with tailored properties via SLM.
• Further research can focus on enhancing mechanical properties and exploring a wider range of compositions and processing parameters.