Magnetic and microstructural aspects of WC-VC-Co-Ru alloys. (November 2018)

• Record Type: Journal Article
• Authors: Chipise, L.; Jain, P.K.; Cornish, L.A.
• Is Part Of: International journal of refractory metals & hard materials. Volume 76(2018)
• Page Start: 49
• Page End: 56
• Publication Date: 2018-11
• Subjects: Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2018.05.017
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Magnetic and microstructural properties of WC-VC-Co-Ru alloys were investigated. To establish the effect of varying Ru and VC content, three alloy series were studied: 80WC-10VC-(10- x )Co- x Ru (0 ≤ x ≤ 3) (wt%), (89.6- x )WC-10Co-0.4VC- x Ru (0 ≤ x ≤ 2) (wt%) and (89.2- x )WC-10Co-0.8VC- x Ru (0 ≤ x ≤ 2) (wt%). Coercivity and magnetic saturation, measured using a magnetic analyzer and a Koerzimeter, were reported. Scanning electron microscopy was used to determine the microstructural parameters: WC mean intercept length, binder mean free path and contiguity. Magnetic saturation decreased with Ru additions for all alloy series, but did not respond to changes in VC content. Coercivity decreased with Ru additions in all three alloy series. Higher VC contents corresponded to higher coercivities. The WC mean intercept length decreased with Ru additions for the (89.6- x )WC-10Co-0.4VC- x Ru series and, to a much lesser extent, the (89.2- x )WC-10Co-0.8VC- x Ru series. For the 80WC-10VC-(10- x )Co- x Ru alloy series, no trend was observed in the WC mean intercept length as Ru was added. The WC mean intercept length was lower for alloy series with higher VC content. The binder mean free path decreased with Ru additions for the 80WC-10VC-(10- x )Co- x Ru and (89.6- x )WC-10Co-0.4VC- x Ru alloy series, but increased for the (89.2- x )WC-10Co-0.8VC- x Ru alloy series. Lower binder mean free paths were associated with higher VC contents. Contiguity increased with Ru content for the 80WC-10VC-(10- x )Co- x Ru alloy series, but decreased for the (89.6- x )WC-10Co-0.4VC- x Ru and (89.2- x )WC-10Co-0.8VC- x Ru alloys. The alloy series with higher VC content had lower contiguities. Highlights: The magnetic and microstructural properties of the WC-VC-Co-Ru alloys studied were affected by both VC and Ru contents. At low VC contents, the WC-VC-Co-Ru alloys had the same magnetic response as conventional WC-Co alloys. There is no clear correlation between magnetic properties and microstructural characteristics of WC-VC-Co-Ru alloys. The 80WC-10VC-(10- x )Co- x Ru alloys fitted most the expression C = 1.03 exp.(-5V β ). The (89.6- x )WC-10Co-0.4VC- x Ru alloys and (89.2- x )WC-10Co-0.8VC- x Ru alloys fitted most the expression, C β = 0.85–1.80V β . The effect of contiguity on the binder mean free path appeared to increase with VC.