Imperial College London
Portrait Picture

Dr Sam Humphry-Baker

Faculty of Engineering, Department of Materials

Lecturer in Ceramics
 
 
 
//

Contact

 

s.humphry-baker

 
 
//

Location

 

LM.04DRoyal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{King:2019:10.1016/j.actamat.2019.01.006,
author = {King, DJM and Cheung, STY and Humphry-Baker, SA and Parkin, C and Couet, A and Cortie, MB and Lumpkin, GR and Middleburgh, SC and Knowles, AJ},
doi = {10.1016/j.actamat.2019.01.006},
journal = {Acta Materialia},
pages = {435--446},
title = {High temperature, low neutron cross-section high-entropy alloys in the Nb-Ti-V-Zr system},
url = {http://dx.doi.org/10.1016/j.actamat.2019.01.006},
volume = {166},
year = {2019}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - High-entropy alloys (HEAs) with high melting points and low thermal neutron cross-section are promising new cladding materials for generation III+ and IV power reactors. In this study a recently developed high throughput computational screening tool Alloy Search and Predict (ASAP) has been used to identify the most likely candidate single-phase HEAs with low thermal neutron cross-section, from over a million four-element equimolar combinations. The selected NbTiVZr HEA was further studied by density functional theory (DFT) for moduli and lattice parameter, and by CALPHAD to predict phase formation with temperature. HEAs of NbTiVZrx (x=0.5, 1, 2) were produced experimentally, with Zr varied as the dominant cross-section modifier. Contrary to previous experimental work, these HEAs were demonstrated to constitute a single-phase HEA system; a result obtained using a faster cooling rate following annealing at 1200°C. However, the beta (BCC) matrix decomposed following aging at 700°C, into a combination of nano-scale beta, alpha (HCP) and C15 Laves phases.
AU  - King,DJM
AU  - Cheung,STY
AU  - Humphry-Baker,SA
AU  - Parkin,C
AU  - Couet,A
AU  - Cortie,MB
AU  - Lumpkin,GR
AU  - Middleburgh,SC
AU  - Knowles,AJ
DO  - 10.1016/j.actamat.2019.01.006
EP  - 446
PY  - 2019///
SN  - 1359-6454
SP  - 435
TI  - High temperature, low neutron cross-section high-entropy alloys in the Nb-Ti-V-Zr system
T2  - Acta Materialia
UR  - http://dx.doi.org/10.1016/j.actamat.2019.01.006
UR  - http://hdl.handle.net/10044/1/65649
VL  - 166
ER  -
Download