Abstract
The Invar effect in 3D transition metal such as Ni and Mn, were prepared on a series composition of binary Ni1-xMnx system with x=0.3, 0.5, 0.8 by using powder metallurgy technique. In this work, the characterization of structural and thermal properties have been investigated experimentally by X-ray diffraction, thermal expansion coefficient and vibrating sample magnetometer (VSM) techniques. The results show that anonymously negative thermal expansion coefficient are changeable in the structure. The results were explained due to the instability relation between magnetic spins with lattice distortion on some of ferromagnetic metals.
Highlights
Invar and the associated binary Fe-Ni alloys are known for their invariance of material properties over a range of temperatures
The purpose of this research of these series is to investigate the physical origin of the Invar phenomenon
Materials and Method: The researcher used a new method of powder metallurgy technique (PMT) in spite of casting or electric arc methods
Summary
Invar and the associated binary Fe-Ni alloys are known for their invariance of material properties over a range of temperatures. Poor machinability is a serious problem associated with the use of Invar alloy in conventional manufacturing process [1]. The most interesting of these compounds has an anomalously small thermal expansion below the Curie temperature [2, 3]. It is one of the most important problems of the 3d magnetic and structural properties [4, 5]. These Invar characteristics are very closely related to the magnetic moment from the slater –Pauling curve with increasing Fe concentration in the Fe – Ni system [6]. The purpose of this research of these series is to investigate the physical origin of the Invar phenomenon
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