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In the present study, both excellent Elinvar and Invar characteristics have been found in the antiferromagnetic Fe-Mn based alloys consisting of about 25 mass%Mn and a small amount of Mo, W, Nb, Ta, Ti, Zr and Hf which are belonging to the 4~6 families in the periodic table. The best characteristics obtained in the present study were constant Young’s modulus (Elinvar characteristics) of 1 × 10−6 K−1 and a small thermal expansion coef cient (Invar characteristics) of 8 × 10−6 K−1 in the temperature range of 293~353 K under appropriate treatment of cold working and annealing. Such alloys will be expected as applications in a wide eld such as precision instruments, electromagnetic devices and controlling devices. [doi:10.2320/matertrans.M2017027]

New Type Fe-Mn Based Alloys with Super Elinvar and Invar Characteristics