| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Advanced Manufacturing, Processing, Characterization and Modeling of Functional Materials
|
| Presentation Title |
Magnetic Shielding Promotion in Laser Powder Bed Fusion of NiFeMo Permalloy via Directional Grain Formation and Thermal Post Processing |
| Author(s) |
Abdel-Moez Mohamed, Richard S Sheridan, Ji Zou, Kai Bongs, Moataz M. Attallah |
| On-Site Speaker (Planned) |
Abdel-Moez Mohamed |
| Abstract Scope |
This study focuses on promoting the magnetic shielding properties of laser powder bed fabricated Ni80Fe15Mo5 alloy via directional grain formation in the easy magnetisation axes and using post-process heat treatments. The as-fabricated vertically oriented samples exhibited weak magnetic properties because of the preferred <100> grain orientation (the hard magnetisation axis). Tilting the samples by 45˚ and 35˚ improved the directional magnetic properties due to promotion of crystal growth in the easy magnetisation axes (<110> and <111>, showing high saturation magnetisation and reducing the coercivity. The magnetic properties were further enhanced by combining hydrogen heat treatment (HT) and hot isostatic pressing (HIP), which led to stress relief, pores closure, and grain growth. It was found that the 35˚ tilted HIP+HT sample achieved the highest magnetic properties. Electron backscattered diffraction and X-ray diffraction were used to rationalise the microstructure-property relations with respect to the interaction between the texture, microstructure, and magnetic properties. |
| Proceedings Inclusion? |
Planned: At-meeting proceedings |