Description
The microstructure of two-phase () shocked zirconium was studied in-situ during heating with high energy X-ray diffraction techniques. The volume fraction of the phase was monitored as the reverse phase transformation occurred:metastable the start and finish temperatures being 470 K and 550 K, respectively, during heating at 3 K/min. Phase strains were monitored and separated in terms of thermal expansion and mechanical strains due to local phase constraints. Stresses in the zirconium were estimated to be a superposition of a hydrostatic component (of order –50 MPa) and uniaxial component (of order –600 MPa) along the c-axis. A high dislocation density was observed in both the phases in the as-shocked state. The dislocation and phasedensity of the decreased preceding the reverse transformation suggesting that it is the presence of the high concentration of defects in the phase which retarded the preverse transformation to the stable hase.
Recommended Citation
Brown, D. (2014). Stability of the two-phase microstructure of shocked zirconium. In A. Bajaj, P. Zavattieri, M. Koslowski, & T. Siegmund (Eds.). Proceedings of the Society of Engineering Science 51st Annual Technical Meeting, October 1-3, 2014 , West Lafayette: Purdue University Libraries Scholarly Publishing Services, 2014. https://docs.lib.purdue.edu/ses2014/mss/mmemb/59
Stability of the two-phase microstructure of shocked zirconium
The microstructure of two-phase () shocked zirconium was studied in-situ during heating with high energy X-ray diffraction techniques. The volume fraction of the phase was monitored as the reverse phase transformation occurred:metastable the start and finish temperatures being 470 K and 550 K, respectively, during heating at 3 K/min. Phase strains were monitored and separated in terms of thermal expansion and mechanical strains due to local phase constraints. Stresses in the zirconium were estimated to be a superposition of a hydrostatic component (of order –50 MPa) and uniaxial component (of order –600 MPa) along the c-axis. A high dislocation density was observed in both the phases in the as-shocked state. The dislocation and phasedensity of the decreased preceding the reverse transformation suggesting that it is the presence of the high concentration of defects in the phase which retarded the preverse transformation to the stable hase.