Formation, and mechanical and magnetic properties of bulk ferromagnetic Fe-Nb-B-Y-(Zr, Co) alloys
- PDF / 182,939 Bytes
- 6 Pages / 585 x 783 pts Page_size
- 80 Downloads / 187 Views
J-H. Kim Small Business Corporation, Ulsan Regional Headquarters, Business Incubation Center, Ulsan 680-749, Korea
E. Fleury Advanced Metal Research Center, Korea Institute of Science and Technology, Seoul 130-650 Korea (Received 12 September 2005; accepted 17 January 2006)
Fe element was partially substituted by Zr and Co in an attempt to enhance the glass-forming ability, and mechanical and soft magnetic properties of Fe74-xNb6B17Y3(Zr, Co)x (x ⳱ 3, 5, 8) amorphous alloys. Both partial replacements resulted in the enhancement of the glass-forming ability, and 3-mm diameter rods with a fully amorphous structure were prepared by a copper mold casting method. Zr and Co containing Fe-based bulk amorphous alloys exhibited high compressive fracture strength of about 4 and 3.5 GPa, respectively. However, Zr and Co induced different effects on the magnetic properties. Whereas the partial replacement of Fe by Zr was found to decrease dramatically the saturation magnetization, the partial replacement of Fe by Co provided an increase of about 25% of the saturation magnetization.
I. INTRODUCTION
Research on bulk metallic glasses (BMGs) has received great attention recently because these materials show many unique properties such as high yield strength, large elastic limit, corrosion resistance, wear resistance, and formability in the supercooled liquid region.1 Because these properties can rarely be found in crystalline materials, BMGs are attractive for practical applications as a new class of structural as well as functional materials.2 Among these BMGs, Fe-based systems are the most important glass forming systems because of the abundant natural resources, low material cost, and unique physical/ mechanical properties. The first announcement of an Febased amorphous alloy with soft magnetic properties by Duwez and Lin3 in 1967 stimulated a large number of researchers because of its great potential for applications. In general, Fe-based BMGs are classified into the two classes of nonferromagnetic systems [such as Fe-Mn-CrMo-C-B, Fe-Cr-(Ln, Y)-Mo-C-B]4–5 and soft magnetic systems [such as Fe-(Nb, Mo, Cr)-(Al, Ga)-P-C-B, Fe(Co, Ni)-(Zr, Hf, Nb, Ta)-B, (Fe, Co, Ni)-Nb-Si-B]6–10
a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2006.0126 J. Mater. Res., Vol. 21, No. 4, Apr 2006
http://journals.cambridge.org
Downloaded: 19 Mar 2015
systems. Recently, for nonferromagnetic systems, Ponnambalam et al.5 and Lu et al.11 developed compositions containing a small amount of Y or Y/Ln (Er, Dy, Yb, and Gd), enabling the formation of fully amorphous rods with diameters larger than 1 cm. The ferromagnetic alloy systems have been intensively investigated and are indeed the major applications of amorphous alloys as transformer cores and electronic article surveillance devices.12 Many attempts were pursued in developing magnetic amorphous alloy composition with large glass-forming abilities (GFA) by investigating multicomponent alloy systems. Modification of the alloy composition for enhanced GF
Data Loading...
