Modification of the alpha-Ti laths to near equiaxed alpha-Ti grains in as-sintered titanium and titanium alloys by a small addition of boron

Yang, Y. F., Yan, M., Luo, S. D., Schaffer, G. B. and Qian, M. (2013) Modification of the alpha-Ti laths to near equiaxed alpha-Ti grains in as-sintered titanium and titanium alloys by a small addition of boron. Journal of Alloys and Compounds, 579 553-557. doi:10.1016/j.jallcom.2013.07.097

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Author Yang, Y. F.
Yan, M.
Luo, S. D.
Schaffer, G. B.
Qian, M.
Title Modification of the alpha-Ti laths to near equiaxed alpha-Ti grains in as-sintered titanium and titanium alloys by a small addition of boron
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
1873-4669
Publication date 2013-12
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2013.07.097
Open Access Status
Volume 579
Start page 553
End page 557
Total pages 5
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2014
Language eng
Formatted abstract
A small addition of boron (B) changes the morphology of the α-Ti laths in as-sintered Ti-6Al-4V and Ti- 10 V-2Fe-3Al to near equiaxed α-Ti grains and increases the number density of the resulting α-Ti grains by up to six folds. TiB forms at about 700 °C during heating to the isothermal sintering temperature and more than 90% of the TiB particles were found inside the α-Ti grains. Transmission electron microscopy (TEM) was used to identify the orientation relationships (ORs) between the TiB and α-Ti phases. Their exact ORs are affected by both the chemistry of the alloy and the processing conditions. The modification of the α-Ti laths and the substantial increase in the number density of the α-Ti grains are attributed to the enhanced heterogeneous nucleation of α-Ti on TiB due to the identified specific ORs and excellent lattice matches between these two phases. In addition, there exists a unique peritectoid reaction between b-Ti and TiB during the subsequent cooling after isothermal sintering by which-Ti + TiB → α-Ti, which may have contributed to the enhanced heterogeneous nucleation of α-Ti on TiB.
Keyword Titanium alloys
Powder metallurgy
Grain refinement
Sintering
Matrix Composite
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 2014 Collection
 
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