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Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion
Liu Xianfeng1,2; Liu Dong1; Liu Renci1; Cui Yuyou1; Yang Rui1
Corresponding AuthorLiu Dong(dliu@imr.ac.cn)
2020-07-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:7Pages:979-987
Abstractbeta solidifying gamma-TiAl alloys are being considered for high-temperature application in the aerospace and automotive industries as high efficiency materials which can withstand temperatures up to 800 degrees C and owns attractively thermal and mechanical properties. Through thermos-mechanical process can obtain excellent alloy properties, such as high strength and better elongation. But it will cause anisotropy. Ti-43.5Al-4Nb-1Mo-0.1B alloy rectangular bar was prepared by isothermal hot canned extrusion process. The OM, SEM, XRD, TEM and tensile methods were used to study the microstructure and tensile properties of the rectangular rods in different states and locations. The results show that the extruded structure of the rectangular rods is relatively uniform and there is no significant difference in the microstructure at different locations. The extrusion deformation makes the orientation of the lamellar uniform, tending to be parallel to the extrusion direction; gamma phase in the grain boundary exists in the three forms of graininess, bulk and strip; the beta phase is shredded during extrusion and is elongated in a parallel extrusion direction. Under the TEM observation, lamellar at the edge of the bar was completely shredded, and lamellar at the core position was elongated after lamellar was broken. A large number of omega(0) phases are generated in the beta(0) phase, and the phase relationship of the two follows: [11 (1) over bar] (beta 0)//[0001](omega 0), {110}(beta 0)//{2 (1) over bar(1) over bar0}(omega 0). The tensile strength reaches 1000 MPa or more and elongations are about 0.5% of the rectangular bar at room temperature; the yield strength is above 400 MPa at 800 degrees C, which exhibits remarkable plasticity. After the ageing treatment of the hot extruded alloy, a large amount of lens-shape gamma phase is formed in the beta(0) phase, and the ageing treatment improves the high temperature tensile properties of the alloy, but the omega(0) phase can not be eliminated.
Keywordbeta solidifying gamma-TiAl alloy hot canned extrusion deformation microstructure tensile property
Funding OrganizationNational Natural Science Foundation of China
DOI10.11900/0412.1961.2019.00388
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51701209]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000538639000006
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139059
Collection中国科学院金属研究所
Corresponding AuthorLiu Dong
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
Recommended Citation
GB/T 7714
Liu Xianfeng,Liu Dong,Liu Renci,et al. Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion[J]. ACTA METALLURGICA SINICA,2020,56(7):979-987.
APA Liu Xianfeng,Liu Dong,Liu Renci,Cui Yuyou,&Yang Rui.(2020).Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion.ACTA METALLURGICA SINICA,56(7),979-987.
MLA Liu Xianfeng,et al."Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion".ACTA METALLURGICA SINICA 56.7(2020):979-987.
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