Dry-Sliding Tribological Properties of TiAl Alloys and Ti{sub 2}AlN/TiAl Composites at High Temperature

The dry-sliding tribological properties of TiAl alloy and its composite Ti{sub 2}AlN/TiAl were investigated comparatively in the temperature range of 25-800 °C. The wear test results showed the wear resistance of TiAl alloy and Ti{sub 2}AlN/TiAl composite from 25 to 400 °C was poor, but it improved...

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Published inJournal of materials engineering and performance Vol. 27; no. 11
Main Authors Zhang, Ningbo, Sun, Dongli, Han, Xiuli, Wang, Daqun, Wang, Qing, Liu, Hao, Yu, Zhenhe
Format Journal Article
LanguageEnglish
Published United States 15.11.2018
Subjects
ALUMINIUM COMPOUNDS
BINARY ALLOY SYSTEMS
COMPOSITE MATERIALS
ENAMELS
FRICTION
LAYERS
MATERIALS SCIENCE
NITROGEN COMPOUNDS
SURFACES
TERNARY ALLOY SYSTEMS
TITANIUM COMPOUNDS
WEAR RESISTANCE
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Summary:The dry-sliding tribological properties of TiAl alloy and its composite Ti{sub 2}AlN/TiAl were investigated comparatively in the temperature range of 25-800 °C. The wear test results showed the wear resistance of TiAl alloy and Ti{sub 2}AlN/TiAl composite from 25 to 400 °C was poor, but it improved obviously when temperature was above 600 °C. Also, 15 vol.% incorporation of Ti{sub 2}AlN particles was beneficial to improve the friction and wear properties of TiAl. Protective oxide layer generated on the wear surface of 15 vol.% Ti{sub 2}AlN/TiAl composite from 25 to 400 °C, hence, the wear resistance improved. Ti{sub 2}AlN particles played a load-carrying role and inhabited the delamination of enamel layer effectively when the temperature was above 800 °C. Overall, Ti{sub 2}AlN particles which acted as hard spots changed the state of wear surface and further provided a second phase strengthening effect, which resulted in the difference in tribological behaviors between TiAl alloy and its composite.
ISSN:1059-9495
1544-1024