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) |
|---|---|
| Pages (from-to) | 311-315 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 162 |
| DOIs | |
| State | Published - Mar 15 2019 |
Funding
This work was supported by the National Key Research and Development Program of China (Grant number of 2016YFB0300104 ). S.Z. Liu was grateful to Dr. Z. C. Liu in Beijing Institute of Technology for helpful discussions.
Keywords
- Dynamic properties
- Impact toughness
- Medium heavy alloys (MHAs)
- Tungsten heavy alloys (WHAs)
- Ultra high strength steels (UHSSs)
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
