Metals and alloys deformed at high strain rates, which are occurring during impact or metal forming situations can suffer from premature failure due to the introduction of so called adiabatic shear bands (ASB). Very high strains occur in these narrow bands of localized deformation. In case of Ti6Al4V these bands are a known mechanism of failure [1,2], Although the main mechanism for adiabatic shearing is the competition between strain hardening and thermal softening, a detailed model of their structure and its role in the formation mechanism is not yet known. In this work a dedicated TEM study of the core structure in these adiabatic shear bands is presented.
展开▼
