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).
Original language | English (US) |
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Pages (from-to) | 311-315 |
Number of pages | 5 |
Journal | Scripta Materialia |
Volume | 162 |
DOIs | |
State | Published - Mar 15 2019 |
Keywords
- Dynamic properties
- Impact toughness
- Medium heavy alloys (MHAs)
- Tungsten heavy alloys (WHAs)
- Ultra high strength steels (UHSSs)
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys