Invar Properties of Cementite (Fe^<1-x>Me_x)_3C, Me=Cr,Mn,Ni
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Lattice parameters and thermal expansion have been measured on cementite partially substituted with Cr, Mn or Ni. The lattice-parameter-composition curves of (Fe_<1-x>Cr_x)_3C and (Fe_<1-x>Mn_x)_3C show notable anomalies at around x=0.08 for Cr and x=0.13 for Mn, where the Curie temperature of the alloys passed through the room temperature region. The lattice parameters at ferromagnetic state are larger than those at paramagnetic state. These compounds show an Invar type thermal expansion below the Curie temperature. These low thermal expansions in a narrow range around Fe_3C are caused by the large positive spontaneous volume magnetostriction in the ferromagnetic state.
- 社団法人日本物理学会の論文
- 1975-10-15
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