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Slip systems are inherent to the symmetry of a crystal system. I expect, because of the reduced symmetry of an orthorhombic crystal, that it will have fewer slip systems and so the critical resolved shear stress of a random direction will be higher.
hamrack-
Hadn't seen this.
Yeah. So like a simillar affect to varying grain pattern would have.Back to the ongoing discussion: I had asked my teacher about this and he gave me a roundabout his explanation (dumbed down a lot I can imagine):
At the different energies the electrons are more likely to be present with differing spacing (smaller spacing at higher energies). If the electrons can overlap with the metal ions they'd be electrostatically more stable. Hence at low energy a wider spacing is favoured (lower packing fraction hence BCC) and when the energy increases smaller gaps are favoured hence FCC. That may explain why it returns to the BCC at an even higher temperature.
Does this sound plausible? I know I must have missed/brushed over complications but as an idea...
HHC
Do orthohombic crystals (thinking of martensite specifically) have an affect on formation/disruption of slip systems other than interfeirance of stress and dislocation feilds?