Effect of W on the thermal stability, mechanical properties and corrosion resistance of Fe-based bulk metallic glass. (April 2022)

• Record Type: Journal Article
• Authors: Zhang, Xuanpeng; Lai, Limin; Xiao, Siming; Zhang, Hongju; Zhang, Feifei; Li, Ning; Guo, Shengfeng
• Is Part Of: Intermetallics. Volume 143(2022)
• Publication Date: 2022-04
• Subjects: Fe-based bulk metallic glasses -- Refractory metal -- Thermal stability -- Corrosion resistance; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2022.107485
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: In this work, the effect of refractory metal W on the thermal stability, mechanical properties and corrosion resistance of Fe36 Cr23 Mo18-X WX C15 B6 Y2 (X = 0, 3, 5, 8, 10, 12, 15, 18) bulk metallic glasses (BMGs) were systematically investigated. The results showed that a wide composition range could be quenched to form BMG when the considerable refractory metal was introduced, although the higher mixing enthalpy of W than Mo between other elements (such as Fe, Cr, C) incited the deterioration of glass forming ability (GFA). The introduction of W significantly improved the thermal stability of the alloy system with glass transition temperature T g and onset crystallization temperature T x of Fe36 Cr23 Mo8 W10 C15 B6 Y2 BMG reached 923 K and 972 K, respectively. The W-bearing Fe-based BMGs also exhibited a very high hardness of 1400 HV and Young's modulus of 271 GPa, respectively. The extremely high thermal stability and elastic modulus were mainly derived from the strong chemical bonding between atoms. In addition, the large addition of W reduced the corrosion current density of the original alloy by an order of magnitude, which was mainly due to the formation of WO3 and the increase of MoO2 in the passivation film which inhibit the pit initiation and pit growth. Highlights: 1. W improve the thermal stability of Fe-based BMGs obviously with very high T g of 923 K. 2. The W-bearing Fe-based BMGs show ultra-high hardness and Young's modulus. 3. The corrosion current density of Fe-based BMGs reduces by an order of magnitude with large addition of W.