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High strengthening effects and excellent wear resistance of Ti 3 Al(Si)C 2 solid solutions
Author(s) -
Wo Shaoshuai,
Huang Zhenying,
Cai Leping,
Hu Wenqiang,
Wang Yuanbo,
Zhou Yang,
Zhai Hongxiang
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13264
Subject(s) - materials science , tribology , indentation hardness , flexural strength , hot pressing , vickers hardness test , friction coefficient , phase (matter) , solid solution , wear resistance , solid solution strengthening , metallurgy , coefficient of friction , composite material , microstructure , chemistry , organic chemistry
The Ti 3 Al 1.2− x Si x C 2 ( x = 0, 0.2, 0.4) powders were synthesized from Ti, Al, Si, and TiC powders, and nearly pure Ti 3 Al 1.2− x Si x C 2 bulks were fabricated by the means of two‐time hot‐pressing method. Significant strengthening effect in bulks was found after the addition of 0.2 Si and 0.4 Si to form Ti 3 Al(Si)C 2 solid solutions. The flexural strengths of Ti 3 AlSi 0.2 C 2 and Ti 3 Al 0.8 Si 0.4 C 2 were 485 and 554 MPa, 14% and 30% larger than the strength of Ti 3 AlC 2 , respectively. The Vickers hardness of these compounds were separately, 6.95 and 7.57 GPa, representing the enhancements of 37% and 49% over those of Ti 3 AlC 2 . The tribological behavior was studied by dry‐sliding method with a S45C steel at the sliding speed of 30 m/s and the normal load of 20‐80 N. The results showed that after incorporating different contents of Si, the friction coefficient was between 0.22 and 0.30, correspondingly lower wear rate was 3.19‐2.61 × 10 −6 mm 3 /Nm. These excellent tribological performances were attributed to the presence of continuous self‐generated oxidized films during tribological examination. Finally, the phase compositions and microhardness of the oxidized films were analyzed and characterized.