Microstructure of Ti-Based, Dendrite/Nanostructured-Matrix Composites

Abstract

Electron microscopy of the composite-forming alloys Ti 60 Cu 14 Ni 12 Sn 4 Nb 10 and Ti 60 Cu 14 Ni 12 Sn 4 Ta 10 , shows that for both alloys, the microstructure consists of an array of micron-scale dendrites surrounded by a nanoscale binary eutectic. In the Ta-containing alloy, one of the eutectic phases has been identified as having a bcc crystal structure similar to that of the dendrites. In the Nb-containing alloy, one of the eutectic phases has been found to have a similar composition to that of the dendrites. Further detailed structural and compositional characterization is needed in order to understand the solidification behaviour of such materials. This knowledge may then be used to improve the casting conditions and subsequent mechanical properties of the materials.

Microstructural and Nano‐Mechanical Characterisation of Multicomponent Composites Nanocrystalline Matrix

“…Dai et al [17] It was again shown that the matrix consisted of a binary eutectic and the earlier proposal that one of the eutectic phases had the same crystal structure as the dendrites [18] was confirmed by selected area electron diffraction (SAD). [17] The contribution from the two eutectic phases could not be separated using SAD and so the diffraction patterns obtained showed two sets of spots superimposed.…”