Size Dependent Compressive Strength of FIB Machined Single Crystal Manganese Pillars
Hittite Journal of Science and Engineering, cilt.11, sa.1, ss.41-47, 2024 (TRDizin)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 11 Sayı: 1
- Basım Tarihi: 2024
- Doi Numarası: 10.17350/hjse19030000330
- Dergi Adı: Hittite Journal of Science and Engineering
- Derginin Tarandığı İndeksler: TR DİZİN (ULAKBİM)
- Sayfa Sayıları: ss.41-47
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Atatürk Üniversitesi Adresli: Evet
Özet
The deformation behavior of single crystals of manganese pillars generated by focused ion beam (FIB), with diameters ranging from ~1 μm to ~4.5 μm, has been studied as a func- tion of specimen size using micropillar compression at ambient temperature. The manga- nese pillars were machined from randomly chosen larger grains of polycrystalline metal. At ambient temperature, single crystals of manganese display chaotic slip planes emerging on the sample surface and brittle plastic deformation when the sample size is decreased to the micrometer scale. The manganese pillars reached very high flow stresses in the range of 4-5.6 GPa. The stress-strain curves of all tested manganese pillars demonstrated significant work hardening and smooth flow behavior, with strains up to 8-10%. After 10% strain, how- ever, the flow stresses remained constant with no work hardening. As previously reported, the manganese pillars with undetermined crystal orientation demonstrated a less pronounced size effect (-0.14) by the size effect exponent of BCC pillars.