Spark plasma sintering of Fe–Si–B–Cu–Nb / Finemet based alloys. (February 2021)

• Record Type: Journal Article
• Authors: Larimian, T.; Chaudhary, V.; Khan, M.U.F.; Ramanujan, R.V.; Gupta, R.K.; Borkar, T.
• Is Part Of: Intermetallics. Volume 129(2021)
• Publication Date: 2021-02
• Subjects: Finemet -- Spark plasma sintering -- Mechanical alloying -- Soft magnetic materials -- Magnetization; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2020.107035
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: The influence of mechanical alloying (MA) and spark plasma sintering (SPS) processing parameters on the microstructure, magnetic and mechanical properties of Finemet (Fe73.5 Cu1 Nb3 Si13.5 B9 ) type alloys was investigated. Finemet alloy powder was obtained via mechanical alloying of elemental powders for 30 h, 60 h, 90 h, and 120 h with ball to powder ratio (BPR) of 10:1 and 15:1. The milled powders were consolidated using the SPS process. The XRD patterns confirm the presence of the α-Fe3 Si phase in all Finemet alloys, also broadening of the (110) peak of α-Fe3 Si was observed with increasing milling time. The microhardness of Finemet alloys increases with increase in milling time primarily due to a decrease in grain size. All samples show good saturation magnetization ( M s ), 120h sample exhibiting the highest M s of 166 emu/g, however coercivity increases with increasing milling time. Additionally, α-Fe3 Si crystal size decreases with increasing the BPR primarily due to higher impact energy. Highlights: Fe–Si–B–Cu–Nb/Finemet alloys processed via mechanical alloying followed by SPS. Finemet alloy powder milled for 120 h Exhibited partial amorphous structure. Microhardness of Finemet alloys increases with decreasing crystallite size. Finemet alloy MA'd for 120hrs. Exhibited excellent soft magnetic behavior.