A novel medium heavy alloy (MHA) with excellent static/dynamic properties and impact toughness. (15th March 2019)

• Record Type: Journal Article
• Authors: Li, Y.; Liu, G.Q.; Hu, X.B.; Wu, L.H.; Tan, C.W.; Dravid, Vinayak P.; Liu, S.Z.
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 311
• Page End: 315
• Publication Date: 2019-03-15
• Subjects: Tungsten heavy alloys (WHAs) -- Ultra high strength steels (UHSSs) -- Medium heavy alloys (MHAs) -- Impact toughness -- Dynamic properties; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.036
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Conventional tungsten heavy alloys (WHAs) fabricated using powder metallurgic method exhibit a much lower strength than ultrahigh strength steels (UHSSs). Here, we first time designed a novel medium heavy alloy (MHA) of 57Ni-37W-5Co-1Ta fabricated using the casting technology. Compared to WHA, this MHA not only largely reduces the difficulty in manufacturing and post working, but also enhances the toughness by ~10 times together with excellent quasi-static and dynamic properties. The superior strength-toughness is attributed to the face-centered cubic (FCC) matrix and/or the nano-sized secondary phases. While the superior dynamic performance is attributed to the widening of adiabatic shear bands (ASBs). Graphical abstract: Unlabelled Image