| About this Abstract |
| Meeting |
TMS Specialty Congress 2024
|
| Symposium
|
Accelerating Discovery for Mechanical Behavior of Materials 2024
|
| Presentation Title |
Defect Populations and Their Linkage to Strength Distribution Parameters in Additively Manufactured Alumina |
| Author(s) |
Sarah Boardman, Corinne E. Packard |
| On-Site Speaker (Planned) |
Corinne E. Packard |
| Abstract Scope |
Optimizing microstructure of additively manufactured ceramics first requires knowledge of the strength-controlling defects, which may or may not be the same defects in conventionally processed ceramics even within the same material system. We use a combination of designed experiments, statistical methods, and extensive fractographic examination to measure the 4-point flexural strength and defect distributions in high purity, Lithography-based Ceramic Manufacturing alumina. We find that the characteristic strengths of fully dense bars are near or above that of conventionally processed alumina for all print conditions, but the Weibull modulus varies greatly (m = 3.8–19.5) depending on print parameters. The dominant strength-controlling defect populations all have a printing-based origin, but the specific defect type varies with print orientation. Lowest performance results from alignment of the print axis along the bar length, yielding a low Weibull modulus arising from weak delamination flaws. Results point towards slurry reformulation as a potential design solution. |
| Proceedings Inclusion? |
Definite: Other |