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Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy
Li, Xiaobing1,2,3; Tang, Hongjian2,3; Xing, Weiwei2,3; Zhao, Pengxiang2,4; Chen, Bo2,3; Ma, Yingche2,3; Liu, Kui2,3
Corresponding AuthorXing, Weiwei(wwxing@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
2021-09-01
Source PublicationINTERMETALLICS
ISSN0966-9795
Volume136Pages:9
AbstractThe effects of W on the microstructure and tensile properties of two high Mn-containing beta - gamma TiAl alloys (nominal composition is Ti-42Al-5Mn and Ti-42Al-5Mn-0.8 W (at.%)) prepared by vacuum induction melting and conventional forging process were systematically investigated. The results showed that there were coarse columnar lamellar colonies in the as-cast W-free alloy, but in the W-added alloy, the microstructure was relatively uniform without the presence of coarse columnar lamellar colony. After forging, the two alloys were all nearly lamellar structure. With W addition, the lamellae size was reduced and the volume fraction of lamellar colonies was slightly decreased whereas the contents of beta o and gamma phases around the lamellar colony were increased. The partitioning behavior of W has also been investigated which was in the order of beta o>alpha 2>gamma in Ti-42Al-5Mn-0.8 W. The research results also proved that W addition had little effect on the distribution behavior of Ti and Al in gamma and alpha 2, whereas it has pronounced impact on that of Mn, Ti and Al in beta o. Under 800 degrees C ageing conditions, a large amount of granular Laves (Ti(Al,Mn)2) phase precipitated from beta o phase in the as-forged W-free alloy, which resulted in the brittle fracture at room temperature. On the contrary, the microstructure and tensile properties of the W-added alloy remain relatively stable with only a small amount of Laves phase observed, most of the beta o phase remained unchanged in the ageing samples. The Laves phase suppressed in W contained alloy are mainly due to the influences of W on the distribution of Mn in the beta o, and the diffusion and enrichment behavior of Mn during ageing.
KeywordTiAl-Mn based intermetallics Microstructure Ageing Laves phase Mechanical properties W
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China of Liaoning province ; China Postdoctoral Science Foundation
DOI10.1016/j.intermet.2021.107230
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51971215] ; National Natural Science Foundation of China of Liaoning province[2019-MS-330] ; China Postdoctoral Science Foundation[2019M661152]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000696701700003
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/166964
Collection中国科学院金属研究所
Corresponding AuthorXing, Weiwei; Liu, Kui
Affiliation1.Ji Hua Lab, Foshan 528200, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
3.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110014, Peoples R China
4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Li, Xiaobing,Tang, Hongjian,Xing, Weiwei,et al. Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy[J]. INTERMETALLICS,2021,136:9.
APA Li, Xiaobing.,Tang, Hongjian.,Xing, Weiwei.,Zhao, Pengxiang.,Chen, Bo.,...&Liu, Kui.(2021).Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy.INTERMETALLICS,136,9.
MLA Li, Xiaobing,et al."Microstructural stability, phase evolution and mechanical properties of a forged W-modified high-Mn beta-gamma-TiAl alloy".INTERMETALLICS 136(2021):9.
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