Prediction of the metatectic reaction: application to hafnium alloys

Abstract

The metatectic reaction\(\beta \xrightarrow{{{\text{cooling}}}}\alpha + {\text{L}}\) is one of the most disadvantageous in relation to high temperature properties of alloys. Assuming the regular solution approximations, the occurrence of this reaction in binary systems where one constituent is subjected to an allotropic transformation is studied. It is shown that the occurrence of the metatectic reaction is strongly related to the difference between the melting and transformation temperatures of the solvent element and to the strain energy contribution of the interaction parameters. It appears that the metatectic reaction is probably more common than is generally assumed.