| http://www.w3.org/ns/prov#value | - om the group consisting of Hafnium, Rhenium and Lanthanides, in particular Cerium, [0024] (d) and a balance of Tantalum [0025] The alloys preferably provide for a uniform beta structure, which is uniform and corrosion resistant, and have the ability for conversion oxidation or nitridization surface hardening of the medical implant or device. [0026] The tungsten content is preferably between 0,1 an
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