Deformation induced Elinvar behavior in Fe-Ni Invar alloy

Fe-Ni alloys exhibiting temperature-independent elastic modulus(Elinvar)and thermal expansion(Invar)properties have found wide and significant applications,such as liquefied natural gas tanks,micrometers,reed relays,hairsprings,etc.[1].Owing to the technical and theoretical importance of Invar and Elinvar effects,the underlying mechanisms of such effects have been

Fe-Ni alloys exhibiting temperature-independent elastic modulus （Elinvar） and thermal expansion （lnvar） properties have found wide and significant applications, such as liquefied natural gas tanks, micrometers, reed relays, hairsprings, etc. [1]. Owing to the technical and theoretical importance of Invar and Eiinvar effects, the underlying mechanisms of such effects have been vital issues in materials science and solid-state physics. Theoretical and experimental studies have been carried out to explain the Invar and Elinvar behaviors from magnetic [2,3] or structural [4] aspects, while no agreement has been reached due to the lack of convincing evidence. Accordingly, ascertaining influencing factors, structural or magnetic, may open a new avenue of understanding such behaviors.