Microstructure and mechanical property of directionally solidified Ti-46Al-0.5W-0.5Si alloys with and without Gd

Ding, Rengen; Jones, I.P.; Chiu, Yu-Lung; Chen, Ruirun

doi:10.1016/j.intermet.2011.08.008

Cited by 6 publications

(1 citation statement)

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“…Thus, rare earth elements could possibly combine both effects in one, by reacting with oxygen from the titanium matrix and by forming small oxides leading to grain refinement. Earlier investigations on titanium alloys with gadolinium addition [10][11][12] exhibit refined grains that improve the strength of the alloys, and it is also well known that gadolinium is an oxygen getter [10,12]. Thus, in this study gadolinium was chosen as a possible addition to Ti-6Al-4V.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Ti–6Al–4V with gadolinium addition fabricated by metal injection moulding

Holm¹,

Ebel²,

Dahms³

2013

Materials & Design

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This study presents the results of investigations on Ti-6Al-4V alloyed with 1 to 5 wt.% gadolinium. The Ti-6Al-4V+Gd samples are fabricated by metal injection moulding (MIM) using Ti-6Al-4V and elemental gadolinium powder. In previous investigations, it is shown that TiB precipitates in Ti-6Al-4V fabricated by MIM result in a microstructure refinement, while the removal of oxygen improves the ductility. Thus, rare earth elements could possibly combine both effects in one, by reacting with oxygen from the titanium matrix and by forming small oxides leading to grain refinement. Because there are actually no investigations concerning Ti-6Al-4V alloyed with gadolinium, this study mainly gives a first overview to show how the microstructure and mechanical features of Ti-6Al-4V change. In order to provide this overview, this study shows that it is possible to prepare a reasonable homogeneous powder metallurgical Ti-6Al-4V alloy with Gd additions by using the MIMtechnique. Adding Gd to Ti-6Al-4V alloy powder and processing the blend by MIM leads to significant grain refinement and a slight change in pore size and shape. However, strength and ductility are reduced by the addition of Gd.

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