Effect of plasma-sprayed alumina on the strength,elastic modulus,and damping of Ti-25Al-10Nb-3V-1Mo intermetallic |
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| Authors: | R U Vaidya A K Zurek A Wolfenden D A Bowles M W Cantu |
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| Affiliation: | (1) Materials Science and Technology, Los Alamos National Laboratory, 87545 Los Alamos, NM, USA;(2) Department of Mechanical Engineering, Texas A and M University, 77843 College Station, TX, USA |
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| Abstract: | The effect of a plasma-sprayed Al2O3 coating on the bend strength, elastic modulus, and damping of Ti-25Al-10Nb-3V-1Mo intermetallic substrate was measured. Two
coating thicknesses of 0.1 and 1.0 mm were used in the study. The average strength and Weibull coefficients of the intermetallic
samples coated with the 0.1 mm Al2O3 coating were very similar to those of the uncoated intermetallic samples. On the other hand, the average strength of the
samples coated with 1.0 mm Al2O3 was significantly lower than the strength of the uncoated intermetallic substrate. The lower strength of the 1.0 mm coated
samples was attributed to the higher volume fraction of the Al2O3 coating (which has a lower strength than the Ti-25Al-10Nb-3V-1Mo substrate) and higher porosity in the 1.0 mm coating. The
Young’s modulus and damping values of the 0.1 mm Al2O3-coated intermetallics did not vary significantly from those of the uncoated substrate. However, the damping values of the
1.0 mm Al2O3-coated intermetallics were significantly larger than those of the uncoated substrate. The higher damping values measured
for the 1.0 mm Al2O3-coated samples were attributed to the higher porosity in the thicker coating and to defects in the coating as a result of
the spraying process. |
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| Keywords: | alumina plasma spray Ti-Al-Nb-V-Mo intermetallic Weibull analysis |
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