Thermal Expansion Coefficient, Temperature Coefficient of Young&amp;rsquo;s Modulus and Equilibrium Diagram of Ferromagnetic Cobalt-Manganese Alloys

Masumoto, Hakaru; Sawaya, Shôhachi; Kikuchi, Michio

doi:10.2320/matertrans1960.11.171

Cited by 5 publications

(1 citation statement)

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“…Following this rule, novel Invar alloys have been found in different systems. For instance, the value of M s /T c reaches a maximum value at a Mn concentration of 23.85% in the Co-Mn binary alloy system, and a minimum TEC also appears for the same composition [75]. In another example, the TEC of the Fe-B amorphous alloys becomes smaller with the decrease of the B content since that the Curie temperature decreases remarkably while the saturation magnetization slowly increases which lead to a larger value of M s /T c [25].…”

Section: Relationship Between Magnetic Properties and Invar Effectmentioning

confidence: 98%

Invar effects in FeNiCo medium entropy alloys: From an Invar treasure map to alloy design

et al. 2019

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To facilitate the understanding of Invar effects and design of FeNiCo-base Invar alloys characterized by low thermal expansion coefficient (TEC), we investigated the magnetic and thermal expansion behavior of an equiatomic prototype medium entropy alloy FeNiCo and a non-equiatomic (super Invar) Fe 63 Ni 32 Co 5 (at. %) reference alloy by means of experiments and ab initio calculations. Both alloys consist of a single face-centered cubic phase with fully recrystallized microstructure in the homogenized state. Large spontaneous volume magnetostriction is observed in both alloys below their respective Curie temperatures. The Invar effect in the non-equiatomic Fe 63 Ni 32 Co 5 alloy is of step-type with nearly zero TEC over a wide temperature range (from room temperature to 120°C) below its Curie temperature. The equiatomic FeNiCo alloy shows a peak-type Invar effect in a very narrow temperature range (from ∼675°C to ∼730°C) with relatively low TECs. The equiatomic FeNiCo alloy shows both higher saturation magnetization and Curie temperature than the non-equiatomic Fe 63 Ni 32 Co 5 alloy. The relationships among magnetic behavior, spontaneous volume magnetostriction and Invar effects for a wider array of metallic alloys are discussed mainly based on Masumoto's rule combined with Wohlfarth's itinerant electron theory. An Invar alloy search map is constructed based on the present results and available literature data to visualize the relationships among saturation magnetization, Curie temperature and thermal expansion coefficient for a wide range of Invar alloys. Based on this treasure map a design route for further developments of new Invar alloys by tuning their magnetic properties is discussed.

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Section: Relationship Between Magnetic Properties and Invar Effectmentioning

confidence: 98%