Superelastic Titanium Alloys for Vibration Damping in Military Aeroengines
Lead Research Organisation:
University of Cambridge
Department Name: Materials Science & Metallurgy
Abstract
Superelastic materials have great potential as the basis for high frequency damping systems, as the martensitic transformation that gives rise to the phenomenon is fully reversible and occurs at near sonic velocities. However, transformation stability is a key issue if these materials are to be successful in engineering applications and so characterising the contributions to their cyclic fatigue behaviour is critical. In addition, little is known about the effect of loading variables, such as strain rates, which can be critical design parameters. As such, results gathered in this work will be used to create a behavioural database, containing information that is not only important in defining the useable design space of these materials but also in identifying points at which behavioural changes occur.
Studentship Projects
| Project Reference | Relationship | Related To | Start | End | Student Name |
|---|---|---|---|---|---|
| EP/R511870/1 | 01/10/2017 | 30/09/2023 | |||
| 2110120 | Studentship | EP/R511870/1 | 01/10/2018 | 30/12/2022 | Nicole Church |
| Description | Work for this award has focussed on the behaviour and properties of Ti2448, which is a commercial Ti-based Superelastic alloy that is currently used in the biomedical sector as a bone replacement alloy. Key findings have formed the basis of 6 publications by the end of the PhD funding period which have helped elucidate the factors that influence different aspects of the Superelastic transformation. Two more publications associated with this funding are currently in review. Skills have been developed in DSC analysis, Mechanical Testing and Microscopy techniques, and synchrotron data collection and analysis. |
| Exploitation Route | This work has the potential to enable the better design and control of Superelastic alloys and their properties by a range of sectors. Whilst this award primarily focusses on use for the Aerospace sector, these alloys also have relevance in other fields such as biomedical, for example, as artificial bone replacement alloys. |
| Sectors | Aerospace, Defence and Marine,Healthcare,Transport |
| Title | Research Data Supporting "Development of Ultra-High Strength Ti-Nb-Sn Alloys Through Grain-Refinement by in situ Zener Pinning" |
| Description | Data corresponding to the figures in the associated paper. Data is provided for alloys of three compositions varying by their Sn content (at.%). Data includes X-ray diffraction data (.xy files) for all alloys in the heat-treated condition, and the as cast condition for the -8Sn alloy, ECCI micrographs (.tiff files) and mechanical testing data (.csv files) for all alloys. EDX data is also included as a .oip file, which can be opened using AZtec software. The associated data necessary for AZtec to read this file is contained in data.zip. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2022 |
| Provided To Others? | Yes |
| URL | https://www.repository.cam.ac.uk/handle/1810/337301 |
| Title | Research Data Supporting "The Effect of Sample Size on the Microstructure and Mechanical Properties of Ti2448 (Ti-24Nb-4Zr-8Sn, wt%)" |
| Description | Data corresponding to the figures in the associated paper. Data includes X-ray diffraction data (.txt files), ECCI micrographs (.tiff files) and mechanical testing data (.csv files). Please refer to the associated manuscript for more details. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2022 |
| Provided To Others? | Yes |
| URL | https://www.repository.cam.ac.uk/handle/1810/340865 |
| Title | Research Data Supporting "The influence of stress on subsequent superelastic behaviour in Ti2448 (Ti-24Nb-4Zr-8Sn, wt%)" |
| Description | Data corresponding to the figures in the associated paper. Data is provided for samples of identical composition (Ti-24Nb-4Zr-8Sn wt%) solution treated at 900C for 30 min under vacuum, cooled at different rates. Data includes X-ray diffraction data (.xy files), DSC data (.txt files), EBSD data (.ctf files), ECCI micrographs (.tiff files) and mechanical testing data (.csv files). Please refer to the associated manuscript for more details. EBSD data was processed using Channel 5 Tango software to generate IPF maps and misorientation data. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2022 |
| Provided To Others? | Yes |
| URL | https://www.repository.cam.ac.uk/handle/1810/332239 |
| Title | Research data supporting "Functional Fatigue During Superelastic Load Cycling of Ti2448 (Ti-24Nb-4Zr-8Sn, wt%)" |
| Description | Data to support the figures in the associated publication. Details of the methods used can be found in the open access publication. .zip files contain the .xy files for the in situ synchrotron data. Files are numbered in sequential order. EBSD (.ctf) and FSD (.tif) data are given, labelled for the number of cycles the sample has been subjected to by that point. These data correspond to the same region of the sample. EBSD data for the initial microstructural condition is also given. Mechanical testing data (.csv) is labelled for the peak load applied for each of the three samples. (.zip) files also contain mechanical testing data obtained during in situ loading in the synchrotron and are labelled accordingly. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2023 |
| Provided To Others? | Yes |
| URL | https://www.repository.cam.ac.uk/handle/1810/346461 |
| Title | Research data supporting "On the Influence of Thermal History on the Martensitic Transformation in Ti-24Nb-4Zr-8Sn (wt%)" |
| Description | Data corresponding to the figures in the associated paper. Data includes X-ray diffraction data, ECCI and EBSD images, TEM diffraction and HAADF data and DSC data. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2021 |
| Provided To Others? | Yes |
| URL | https://www.repository.cam.ac.uk/handle/1810/326404 |
| Title | Research data supporting "The influence of grain size on the onset of the superelastic transformation in Ti-24Nb-4Sn-8Zr (wt%)" |
| Description | Data corresponding to the figures in the associated paper. Data includes X-ray diffraction data (.txt and .xy files), EBSD data (.ctf files) and mechanical testing data (.csv files) for samples in two series (Rolled bar and Plate material), with systematically varying grain sizes (achieved by varying solution-treatment time). Please refer to the associated paper for more information regarding sample conditions and preparation. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2022 |
| Provided To Others? | Yes |
| URL | https://www.repository.cam.ac.uk/handle/1810/332240 |