About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Lightweight Composites, Materials & Alloys
|
| Presentation Title |
Crystal Plasticity Insights Into Directionally Dependent Surface Roughness in CP-Ti |
| Author(s) |
Kyung Mun Min, Hyuk Jong Bong |
| On-Site Speaker (Planned) |
Kyung Mun Min |
| Abstract Scope |
This study examines the evolution of surface roughness and the underlying deformation mechanisms in commercially pure titanium (CP-Ti) sheets, a promising material for metallic bipolar plates in fuel cells. When loaded along the rolling direction (RD), CP-Ti sheets developed pronounced surface creases and significant roughness. In contrast, transverse direction (TD) loading produced lower roughness and a more uniform surface texture. Crystal plasticity finite element modeling revealed that this directional dependence arises from differences in slip and twinning system activation. RD loading was dominated by prismatic ⟨a⟩ slip, limiting through-thickness deformation, while TD loading activated multiple deformation modes, enabling more distributed strain. These findings were supported by fractographic features observed through scanning electron microscopy. Given that excessive surface roughness can impair both formability and corrosion resistance, this work offers insights for designing durable CP-Ti bipolar plates for next-generation fuel cells. |