Abstract
A TEM study of pure tantalum and tantalum-tungsten alloys explosivelyshocked at a peak pressure of 30 GPa is presented. While no omega phase wasfound in shock-recovered pure Ta and Ta-5W which mainly contain a cellulardislocation structure, a shock-induced omega phase was found in Ta-10Wwhich contains evenly distributed dislocations with a density higher than1 × 1012 cm − 2. The shock-induced (hexagonal) transition occurs when the dynamic recovery of dislocations becomes largelysuppressed in Ta-10W shocked under dynamic-pressure conditions. A dislocation-basedmechanism is proposed for the shock-induced phase transformation.
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