Metallurgical Abstracts on Light Metals and Alloys vol. 58
Alloy Design and Solidification Microstructure of Ti-Zr-Hf-Ag-V Multi-Component Alloys with a Dual Bcc Structure
Takeshi Nagase*, Mitsuharu Todai**,***, Satoshi Ichikawa****, Aira Matsugaki***** and Takayoshi Nakano*****
* Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, Himeji 671-2280, Japan
** Department of Environmental Materials Engineering, National Institute of Technology, Niihama College, Ehime, 792-8580, Japan
*** Institute of Industrial Science, The University of Tokyo, 4-6-1, Komaba Megro-ku, Tokyo 153-8505, Japan
**** Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Ibaraki 567-0047, Japan
***** Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita 565-0871, Osaka, Japan
[Published in Materials Transactions, Vol. 65 (2024), pp. 1041-1048]
https://doi.org/10.2320/matertrans.MT-MA2024009
E-mail: m.todai[at]niihama-nct.ac.jp
Key Words: high entropy alloys, metals and alloys, microstructure, solidification, liquid phase separation
TiZrHfAgV0.2 (Ti23.8Zr23.8Hf23.8Ag23.8V4.8, at%) high entropy alloys (HEAs) with a dual bcc structure were developed. Fine lamella structure was observed in the arc-melted ingots and melt-spun ribbons. The TiZrHfAgV0.2 HEAs with a dual bcc phase structure were designed by exploiting the concept of immiscibility of the constituent elements. The immiscibility of the constituent elements in the multi-component alloys was discussed using the mixing enthalpy (ΔHi-j) matrix of the i-j elements, binary phase diagrams with liquid miscibility gap, and the thermodynamic calculations.
TiZrHfAgV0.2 HEA was designed based on the concept of immiscibility of the constituent elements by using mixing enthalpy, binary phase diagrams with stable and meta-stable liquid miscibility gap, and the thermodynamic calculations. This graphical abstract shows the phase constitution and Solidification microstructure of the rapidly-solidified melt-spun ribbons in the TiZrHfAgV0.2 HEA.