Effect of a weak magnetic field on ductile–brittle transition in micro-cutting of single-crystal calcium fluoride

• A weak magnetic field can enhance ductile-mode cutting of CaF 2 single crystal. Magnetic direction shows anisotropy in affecting ductile–brittle transition. coupled analysis magneto-plasticity and crystal plasticity is developed. Dislocation behaviour fracture toughness are revealed under field. DFT computation corroborates the magnetic-induced dislocation depinning theory. Magneto-plasticity occurs when a alters material offers viable solution to brittle materials. This study demonstrates susceptibility non-magnetic single-crystal calcium fluoride (CaF ) magneto-plastic effect. The influence on was confirmed micro-deformation tests 20 mT. surface pile-up effect weakened by 10–15 nm along with an enlarged plastic zone suppressed crack propagation Micro-cutting different orientations ( 111 plane increase transition machined aid where largest occurred [ 11 ¯ ] orientation from 512 range 664–806 nm. Meanwhile, subsurface damage layer concurrently thinner influence. An anisotropic relative also observed. analytical model derived determine factor M that successfully describes while considering behaviour, toughness, Previously suggested theoretical mechanism via formation non-singlet electronic states defected configurations density functional theory calculations. successful findings present opportunity for adoption magnetic-assisted micro-cutting