Stress-strain behavior of lamellar Ti-38Al-3Zr and -3Nb alloys with average lamellar thickness ranging from 10 to 1000 nm were studied at room temperature. Their yield stresses decrease from a high value of coherent lamellar structures to a low value after introducing misfit dislocations onto lamellar boundaries. Their strain hardening rates increase with decreasing lamellar thickness, and then drop to a low level when the misfit dislocations become absent. There is critical thickness of γ lamellae for introduction of misfit dislocations. The thickness decreases with increasing lattice misfit between the constituent phases.
ASJC Scopus subject areas
- Physics and Astronomy(all)