Phase diagrams of the 5th group metals

1 Phase diagrams of the 5th group metals. The compound formation patterns of Y Nb and Ta are shown in Fig 5.20. Several analogies between them may be remarked (1) no compound formation is observed with the lanthanides and the actinides, (2) an extended region of no-compounds is represented by the metals of the first groups (up to about the 6th group however check the vanadium pattern), 

H Compound-forming element O Phase diagram known no intermediate phases formed No information available B Questionable compound forming capability 

The trend of intermetallic reactivity and alloy stability of V, Nb and Ta with the different elements may be further discussed in terms of the melting points of the compounds as described in the following paragraphs. 

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