|About this Abstract
||2010 TMS Annual Meeting & Exhibition
||Processing Materials for Properties
||Direct Laser Deposition of Bulk Metallic Glasses
||Hongqing Sun, Pete C. Collins, Hamish L. Fraser, Katharine M. Flores
|On-Site Speaker (Planned)
Bulk metallic glasses (BMGs) have attracted tremendous attention as structural materials because of their remarkable mechanical properties. However, the critical cooling rates required to produce an amorphous atomic structure limit the dimensions of as-cast BMG components and therefore restrict their widespread use. As a layer-by-layer additive process with localized heat input and inherently rapid cooling, direct laser deposition provides the potential opportunity to produce non-equilibrium or amorphous structures that exceed the as-cast dimensional limit. In the present work, we use the Laser Engineering Net Shaping (LENS<SUP>TM</SUP>) process to deposit pre-alloyed Zr-based metallic glass forming powders. A continuous amorphous layer was achieved with optimization of the processing parameters. However, the accumulated heat input during multi-layer deposition results in the crystallization at the bottom of the deposit. To address this, we investigate the thermal history of the deposit and substrate using a combination of finite element modeling and in-situ thermal imaging.
||Definite: A CD-only volume