The effect of Si additions on the sintering and sintered microstructure and mechanical properties of Ti-3Ni alloy

Yang, Y. F., Luo, S. D., Bettles, C. J., Schaffer, G. B. and Qian, M. (2011) The effect of Si additions on the sintering and sintered microstructure and mechanical properties of Ti-3Ni alloy. Materials Science and Engineering A: Structural Materials: Properties Microstructure and Processing, 528 24: 7381-7387. doi:10.1016/j.msea.2011.06.029


Author Yang, Y. F.
Luo, S. D.
Bettles, C. J.
Schaffer, G. B.
Qian, M.
Title The effect of Si additions on the sintering and sintered microstructure and mechanical properties of Ti-3Ni alloy
Journal name Materials Science and Engineering A: Structural Materials: Properties Microstructure and Processing   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2011-09-15
Sub-type Article (original research)
DOI 10.1016/j.msea.2011.06.029
Volume 528
Issue 24
Start page 7381
End page 7387
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
Thermodynamic predictions suggest that silicon has the potential to be a potent sintering aid for Ti–Ni alloys because small additions of Si lower the solidus of Ti–Ni alloys appreciably (>200 °C by 1 wt.% Si). A systematic study has been made of the effect of Si on the sintering of a Ti–3Ni alloy at 1300 °C. The sintered density increased from 91.8% theoretical density (TD) to 99.2%TD with increasing Si from 0% to 2%. Microstructural examination reveals that coarse particles and/or continuous networks of Ti5Si3 form along grain boundaries when the addition of Si exceeds 1%. The grain boundary Ti5Si3 phase leads to predominantly intergranular fracture and therefore a sharp decrease in ductility concomitant with increased tensile strengths. The optimum addition of Si is proposed to be ≤1%. Dilatometry experiments reveal different shrinkage behaviours with respect to different Si contents. Interrupted differential scanning calorimetry (DSC) experiments and corresponding X-ray diffraction (XRD) analyses clarify the sequence of phase formation during heating. The results provide a useful basis for powder metallurgy (PM) Ti alloy design with Si.
Keyword Titanium
Silicon
Sintering aid
Powder metallurgy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2012 Collection
 
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