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Effect of Cooling Rate on Boride and Room Temperature Tensile Properties of beta-Solidifying gamma-TiAl Alloys
Wang Xi1,2; Liu Renci1; Cao Ruxin3; Jia Qing1; Cui Yuyou1; Yang Rui1
Corresponding AuthorLiu Renci(rcliu@imr.ac.cn)
2020-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:2Pages:203-211
Abstractbeta-solidifying gamma-TiAl alloys have attracted much attention for their higher specific strength and better mechanical properties at elevated temperature. They usually need some boron addition to refine the lamellar grain size, which is believed to improve their poor room temperature ductility. However, the boron addition may cause some side effects on mechanical properties for the formation of borides with unfavorable morphology and crystal structure, which is severely influenced by the alloy composition and cooling rate during casting. The components of gamma-TiAl applied usually have complex structure, such as different thicknesses, which leads to different cooling rates and therefore different microstructures and mechanical properties. To evaluate the influence of cooling rate on the microstructure and mechanical properties of gamma-TiAl investment casting, plate with step thicknesses was designed to achieve different cooling rates. Step plates of beta-solidifying boron-containing TiAl alloy were fabricated by centrifugal casting in Y2O3 facing coating ceramic moulds. It was found that boride mainly distributed on grain boundary, and its aspect ratio increased with increasing cooling rate, with its morphology varying from short, flat plate to long, curvy ribbon. The short plate and curvy ribbon borides were TiB with B27 and B structure, respectively. Both types of boride exhibit anisotropic growth characteristics (especially for B, structure), with the slowest growth rate along [100] and [010] for B27 structure and B, structure, respectively. This is attributed to the difficulty of atomic rearrangement along corresponding directions during solidification. The cooling rate increase caused the increase of yield strength but the decrease of room temperature ductility, the former results from the decreasing of grain size and lamellar spacing, while the latter results from the easy cracking nucleation and propagation of the long curvy boride, leaving smooth curvy surfaces on the fracture surface. Samples containing short flat plate boride showed better ductility, and no smooth curvy surface was observed.
Keywordgamma-TiAl alloy beta-solidifying investment casting cooling rate boride tensile property
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China
DOI10.11900/0412.1961.2019.00100
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51701209] ; National Key Research and Development Program of China[2016YFB0701304] ; National Key Research and Development Program of China[2016YFB0701305]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000507327100008
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/136749
Collection中国科学院金属研究所
Corresponding AuthorLiu Renci
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Coll Mat Sci & Engn, Shenyang 110016, Peoples R China
3.China Three Gorges Univ, Coll Mech & Power Engn, Yichang 443002, Peoples R China
Recommended Citation
GB/T 7714
Wang Xi,Liu Renci,Cao Ruxin,et al. Effect of Cooling Rate on Boride and Room Temperature Tensile Properties of beta-Solidifying gamma-TiAl Alloys[J]. ACTA METALLURGICA SINICA,2020,56(2):203-211.
APA Wang Xi,Liu Renci,Cao Ruxin,Jia Qing,Cui Yuyou,&Yang Rui.(2020).Effect of Cooling Rate on Boride and Room Temperature Tensile Properties of beta-Solidifying gamma-TiAl Alloys.ACTA METALLURGICA SINICA,56(2),203-211.
MLA Wang Xi,et al."Effect of Cooling Rate on Boride and Room Temperature Tensile Properties of beta-Solidifying gamma-TiAl Alloys".ACTA METALLURGICA SINICA 56.2(2020):203-211.
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