About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys VIII
|
Presentation Title |
J-85: Developing Non-equiatomic Refractory BCC HEAs with Improved Mechanical Properties Using Combinatorial Screening |
Author(s) |
Taohid Bin Nur Tuhser, Ian Stewart Winter, Daryl Chrzan, Andrew Minor, Mark Asta, Thomas John Balk |
On-Site Speaker (Planned) |
Taohid Bin Nur Tuhser |
Abstract Scope |
The optimum balance between ductility and hardness of refractory
high entropy alloys (RHEAs) is strongly dependent on alloy composition, which need not
be exactly equiatomic. In this study, 2D composition gradients of VNbMoTaW and
VNbMoTaWHf thin films were made by magnetron sputtering. Replacing Mo with
Nb in the same system is expected to improve ductility. X-ray diffraction and
energy dispersive x-ray spectroscopy were used to develop a map of alloy
phase space. The BCC crystal structure was stable for Nb ranging from 10.4 at% to 28.7 at% for VNbMoTaW and 8.4 at% to 22.6 at% for VNbMoTaWHf system. Bulk samples of varying Nb compositions were prepared using vacuum arc melting. Mechanical properties, including hardness and ductility of tensile specimens, were investigated with the bulk samples. Finally, a series of thermomechanical processing for selected compositions were done to check the phase stability and to establish appropriate composition-structure-property relationships. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |