Influence of dwell time and pressure on SPS process with titanium Aluminides

authored by: Bernd Arno Behrens, Kai Brunotte, Julius Peddinghaus, Adrian Heymann
Abstract: Spark plasma sintering (SPS) or the field-assisted sintering technique (FAST) is commonly used to process powders that are difficult to consolidate, more efficiently than in the conventional powder metallurgy process route. During the process, holding time and applied holding pressure influence the product’s microstructure and subsequently its properties. In this study, in addition to the temperature impact, the influence of pressure and dwell time on the consolidation behaviour of titanium aluminide (TiAl) powders during the SPS process is investigated. Commercially available pre-alloyed TiAl48-2Cr-2Nb (GE48) and TiAl44-4Nb-0.7Mo-0.1B (TNM) powders were used, which have a high application potential in, for example, the aerospace industry. The results were evaluated based on microstructural analyses, hardness measurements and relative density calculations. It was shown that the investigated parameters significantly influence the sintering results, especially in the low temperature range. Depending on the temperature field in the sample, complete sintering is not achieved if the dwell time is too short in combination with too low a pressure. Above a certain temperature, the impact of holding pressure and holding time is significantly lower.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Article
Journal: Metals
Volume: 12
ISSN: 2075-4701
Publication date: 04.01.2022
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Materials Science, Metals and Alloys
Electronic version(s): https://doi.org/10.3390/met12010083 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{f7b87e12b18f4e579e25057f585ae483,
title = "Influence of dwell time and pressure on SPS process with titanium Aluminides",
abstract = "Spark plasma sintering (SPS) or the field-assisted sintering technique (FAST) is commonly used to process powders that are difficult to consolidate, more efficiently than in the conventional powder metallurgy process route. During the process, holding time and applied holding pressure influence the product{\textquoteright}s microstructure and subsequently its properties. In this study, in addition to the temperature impact, the influence of pressure and dwell time on the consolidation behaviour of titanium aluminide (TiAl) powders during the SPS process is investigated. Commercially available pre-alloyed TiAl48-2Cr-2Nb (GE48) and TiAl44-4Nb-0.7Mo-0.1B (TNM) powders were used, which have a high application potential in, for example, the aerospace industry. The results were evaluated based on microstructural analyses, hardness measurements and relative density calculations. It was shown that the investigated parameters significantly influence the sintering results, especially in the low temperature range. Depending on the temperature field in the sample, complete sintering is not achieved if the dwell time is too short in combination with too low a pressure. Above a certain temperature, the impact of holding pressure and holding time is significantly lower.",
keywords = "Powder metallurgical process, Spark plasma sintering, TiAl powders",
author = "Behrens, {Bernd Arno} and Kai Brunotte and Julius Peddinghaus and Adrian Heymann",
note = "Funding Information: Funding: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) ",
year = "2022",
month = jan,
day = "4",
doi = "10.3390/met12010083",
language = "English",
volume = "12",
journal = "Metals",
issn = "2075-4701",
publisher = "Multidisciplinary Digital Publishing Institute",
number = "1",
}