首页|Multifunctional nanostructured NiTi alloy with Invar, Elinvar and Rinvar properties
Multifunctional nanostructured NiTi alloy with Invar, Elinvar and Rinvar properties
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NSTL
Elsevier
? 2022 Elsevier B.V.A multifunctional NiTi alloy with Invar (dimension-invariant), Elinvar (elastic modulus-invariant) and Rinvar (resistivity-invariant) properties over the temperature range from 125 K to 375 K is fabricated through cold rolling of 60% thickness reduction. The underlying microstructure of such multifunctional NiTi alloy mainly consists of B2 and B19′ nanocrystals which can continuously undergo a small fraction of thermally induced B2?B19′ phase transition over a wide temperature range. Such phase transition can induce a negative thermal expansion to compensate for the positive expansions of the B2 and B19′ phases and thus yield the Invar property. Meanwhile, the opposite temperature dependences of elastic modulus of the B2 and B19′ phases can compensate each other and cause the macroscopic overall Elinvar property. In addition, the presence of nanocrystals enhances the negative temperature dependence of resistivity (TDR) caused by boundary scattering, which compensates for the positive TDR due to background scattering and thus leads to the Rinvar behavior. The three compensation mechanisms in the dual-phase nanostructure can also be exploited in other shape memory alloys to obtain the Invar, Elinvar and Rinvar properties so as to broaden their applications.
NSTL
Elsevier
