Imperial College London

Professor David W. McComb

Faculty of EngineeringDepartment of Materials

Adjunct Professor
 
 
 
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Contact

 

+44 (0)20 7594 6750d.mccomb Website

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Smith:2018:10.1007/s11661-018-4701-5,
author = {Smith, TM and Esser, BD and Good, B and Hooshmand, MS and Viswanathan, GB and Rae, CMF and Ghazisaeidi, M and McComb, DW and Mills, MJ},
doi = {10.1007/s11661-018-4701-5},
journal = {Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science},
pages = {4186--4198},
title = {Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys},
url = {http://dx.doi.org/10.1007/s11661-018-4701-5},
volume = {49},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - © 2018, The Minerals, Metals & Materials Society and ASM International. In this study, local chemical and structural changes along superlattice intrinsic stacking faults combine to represent an atomic-scale phase transformation. In order to elicit stacking fault shear, creep tests of two different single crystal Ni-based superalloys, ME501 and CMSX-4, were performed near 750 °C using stresses of 552 and 750 MPa, respectively. Through high-resolution scanning transmission electron microscopy (STEM) and state-of-the-art energy dispersive X-ray spectroscopy, ordered compositional changes were measured along SISFs in both alloys. For both instances, the elemental segregation and local crystal structure present along the SISFs are consistent with a nanoscale γ′ to D019 phase transformation. Other notable observations are prominent γ-rich Cottrell atmospheres and new evidence of more complex reordering processes responsible for the formation of these faults. These findings are further supported using density functional theory calculations and high-angle annular dark-field (HAADF)-STEM image simulations.
AU - Smith,TM
AU - Esser,BD
AU - Good,B
AU - Hooshmand,MS
AU - Viswanathan,GB
AU - Rae,CMF
AU - Ghazisaeidi,M
AU - McComb,DW
AU - Mills,MJ
DO - 10.1007/s11661-018-4701-5
EP - 4198
PY - 2018///
SN - 1073-5623
SP - 4186
TI - Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys
T2 - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
UR - http://dx.doi.org/10.1007/s11661-018-4701-5
VL - 49
ER -