Experimental evaluation of glass forming ability of Fe48-xMo14Cr15Y2C15B6Six (x= 0 ou 8) alloys

• Grant number: 15/19502-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2015
• End date: December 31, 2018
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
• Principal Investigator: Claudio Shyinti Kiminami
• Grantee: Giovanne Lopes Liberato
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 13/05987-8 - Processing and characterization of amorphous, metastable and nano-structured metallic alloys, AP.TEM
• Associated scholarship(s): 17/26038-5 - Characterization of extruded samples of Fe43.2Co28.8B19.2Si4.8Nb4 amorphous alloy by computed tomography and scanning electron microscopy, BE.EP.IC

Abstract

The Fe-Cr based amorphous alloys has attracted increasing interest due mainly to high corrosion resistance and mechanical properties of these alloys. The most promising application for Fe-Cr based amorphous alloys is as protective coatings against corrosion. However, for the amorphous alloy used in this application, the content of elements such as Mo and Cr are high, which significantly raises the cost. Thus, it is important to conduct studies on compositions to improve the cost/ benefit relation of these alloys making them more competitive compared to the stainless steels and other alloys used in corrosion-resistant coatings. Si is an inexpensive element and it has been reported in the literature that its presence in magnetic "soft" amorphous alloys significantly increases the corrosion resistance of the alloy. This element, when present in amorphous Fe-Cr based alloy, is added in small quantities, and still it is not clear their effect on the glass forming ability, GFA, and the corrosion resistance of these alloys. Therefore, this project for Scientific Initiation aims to evaluate the effect of Si addition on the GFA in the Fe-Mo-Cr-Y-C system alloys through study of two alloys: Fe48Mo14Cr15Y2C15B6 (no Si content) and Fe40Mo14Cr15Y2C15B6Si8 (with addition of 8 at% Si and reduction of Fe content)The goals are to confirm the ability of formation of amorphous structure of the two selected alloys and establishing which of the two has higher GFA and quantification of the maximum thickness of sample produced by casting in cooper mound with amorphous structure for each of the two compositions.