Spark plasma sintering of Ti–1Al–8V–5Fe alloy: densification mechanism and grain growth
Applied Physics A: Materials Science and Processing, ISSN: 1432-0630, Vol: 126, Issue: 9
2020
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Article Description
The Ti–1Al–8V–5Fe (Ti185) alloys were prepared by spark plasma sintering (SPS) from TiH, FeV, Al and Fe powders. The densification mechanism and grain-growth behavior of as-sintered alloys during SPS were investigated at temperatures of 800–1200 °C. A modified creep model considering liquid phase is proposed to modify the deviation of effective stress. The result shows that liquid phase caused by low-melting-point elemental powder can increase the effective stress, which enhances the particle rearrangement and densification. Densification stage at low temperature (800–1000 °C) without obvious grain growth and grain growth stage at 1100–1200 °C were identified during SPS process. At early densification stage, it is controlled by diffusion-controlled grain boundary sliding where the stress exponent n is close to 1, while at next stage, it is dominated by dislocation-climbing corresponding to the n close to 3. The grain-growth mechanism of SPS Ti185 during grain-growth stage was under the control of bulk and grain boundary diffusion.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85089531230&origin=inward; http://dx.doi.org/10.1007/s00339-020-03911-w; https://link.springer.com/10.1007/s00339-020-03911-w; https://link.springer.com/content/pdf/10.1007/s00339-020-03911-w.pdf; https://link.springer.com/article/10.1007/s00339-020-03911-w/fulltext.html; https://dx.doi.org/10.1007/s00339-020-03911-w; https://link.springer.com/article/10.1007/s00339-020-03911-w
Springer Science and Business Media LLC
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