Role of Microstructure Discontinuities in the Soft Magnetic Composites with Aluminium Alloy Addition

Archives of Metallurgy and Materials

R. Bidulský¹  M. Actis Grande¹  J. Bidulská² 

[1] Politecnico Di Torino, Department of Applied Science and Technology, Alessandria, Italy;Technical University of Košice, Faculty of Metallurgy, Department of Metals Forming, Košice, Slovakia

关键词: Keywords : Soft Magnetic Composites;    Insulated Iron Powder Compound;    Aluminium Alloy;    Coercivity;    Specific Losses;   

DOI  :  10.2478/amm-2013-0001

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The paper focuses on the effect of both the aluminium alloy addition and microstructural inhomogeneties on the magnetic behaviour of soft magnetic materials tested at low frequencies. The IIPC material (base on the commercial Somaloy 1P powder) has been blended with different amounts of commercially aluminium alloy Alumix 321 (0, 5 and 10 wt %). Specimens with a different green density were obtained by pressing at a pressure in the range from 400 to 800 MPa. Different thermal treatments (in air or nitrogen at the maximum temperature of 500ºC for 30 min) were carried out on the evaluated systems. The microstructure investigation revealed that for materials with high aluminium alloy contents, pores are located nearby or around the aluminium alloy particles. The heat treatment regime resulted in a coarse-grained structure with a small number of inclusions within the grains and at the grain boundaries. The comparison of the results indicated that the magnetic properties were considerably dependent on the microstructural inhomogeneities.

【 授权许可】

Unknown