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Solid bubble formation in titanium injected with krypton ions

1986; Elsevier BV; Volume: 138; Issue: 2-3 Linguagem: Inglês

10.1016/0022-3115(86)90004-8

1873-4820

J.H. Evans, D.J. Mazey,

Nuclear Materials and Properties

The precipitation of krypton ions injected into titanium at 300 K has been investigated using transmission electron microscopy and electron diffraction. The substructure contained the very high concentration of bubbles characteristic of inert gas implantations into metals. The additional result of interest to be discussed in the present paper was the finding of solid krypton within bubbles having an hexagonal-close-packed (hcp) structure epitaxial with the parent hcp Ti matrix. A brief study is included of the melting of solid krypton during annealing using dark field electron microscopy and lattice parameter measurements. The results are discussed with regard to recent studies of solid inert-gas precipitation in fcc and bcc metals. In particular, a compilation of the effect of metal shear modulus on solid xenon and solid krypton bubble pressures for various metals appears to clarify the possible pressure dependence of bubble growth mechanisms.