Wire electric discharge machining induced titanium hydride in Ti-46Al-2Cr alloy

G. W. Qin, K. Oikawa, G. D.W. Smith, S. M. Hao

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Wire electric discharge machining (Wire-EDM) induced a new phase in Ti-46Al-2Cr (in at.%) intermetallic alloy has been identified by using X-ray diffraction technique. The new phase is found to be neither TiO2 nor Al2O3, but well consistent with fcc structure titanium hydride with the lattice parameter of 4.49-4.50 Å. The new phase exists in the wire-EDM cut alloy surface layer limiting to about 70 μm thick, much deeper than the wire-EDM induced recast layer thickness of 2-3 μm. One processing, vacuum annealing at 400-600 °C, has been proposed to remove this hydride induced by wire-EDM. In addition, The wire-EDM induced microcracks extensively happen on the EDM-cut surface and penetrate into matrix up to 10-30 μm.

Original languageEnglish
Pages (from-to)907-910
Number of pages4
Issue number9
Publication statusPublished - 2003 Sept


  • A. Titanium aluminides, based on TiAl
  • C. Electric discharge machining
  • F. X-ray diffraction


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