Journal article
The sintering densification, microstructure and mechanical properties of gamma Ti-48Al-2Cr-2Nb alloy with a small addition of copper
Y Xia, SD Luo, X Wu, GB Schaffer, M Qian
Materials Science and Engineering A | ELSEVIER SCIENCE SA | Published : 2013
Abstract
Titanium aluminide based alloys are difficult to consolidate by pressureless sintering. A systematic study has been made of the effect of small additions of copper on the sintering densification, microstructure and mechanical properties of gamma Ti-48Al-2Cr-2Nb (in at% throughout). The density of the Ti-48Al-2Cr-2Nb alloy sintered at 1375 °C for 120. min increased consistently from 74% theoretical density (TD) without Cu to >98%TD with an addition of up to 2. at%Cu. The enabling effect of a small addition of Cu is due to the formation of a wetting liquid, supported by dilatometry, differential scanning calorimetry (DSC) and Thermal-Calc analyses. Rapid sintering shrinkage occurred around 125..
View full abstractGrants
Funding Acknowledgements
This work was supported by the Australian Research Council. Yang Xia wishes to thank The University of Queensland (UQ) for an UQ International Research Tuition Award (UQIRTA) and the China Scholarship Council (CSC) for a CSC scholarship. Useful discussion with Dr Dong Qiu of UQ on the TEM characterisation shown in Fig. 5 is acknowledged.