Nonferromagnetic Cr-base ternary Invar alloys of BCC structure

All the Invar alloys now in practical application are ferromagnetic Fe-base alloys of the fcc structure, but the ferromagnetism of these alloys is often liable to limit the scope of their application. Very recently, the present authors discovered that antiferromagnetic Cr-Fe-Mn ternary solid solution alloys of the bcc structure possess Invar characteristics over a wide temperature range centered around room temperature, and furthermore, that the alloys are practically free from any magnetic effect. It became clear that these alloys show Elinvar characteristics in the Invar temperature range. Similar results have been obtained on a number of other Cr-based ternary solid solution alloys of the bcc structure.