Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion

doi:10.11900/0412.1961.2019.00388

CORC > 金属研究所 > 中国科学院金属研究所

	Microstructure and Tensile Properties of Ti-43.5Al-4Nb-1Mo-0.1B Alloy Processed by Hot Canned Extrusion
	Liu Xianfeng 1,2; Liu Dong 1; Liu Renci 1; Cui Yuyou 1; Yang Rui 1
刊名	ACTA METALLURGICA SINICA
	2020-07-11
卷号	56 期号:7 页码:979-987
关键词	beta solidifying gamma-TiAl alloy hot canned extrusion deformation microstructure tensile property
ISSN号	0412-1961
DOI	10.11900/0412.1961.2019.00388
通讯作者	Liu Dong(dliu@imr.ac.cn)
英文摘要	beta 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.
资助项目	National Natural Science Foundation of China[51701209]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000538639000006
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/139058]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu Dong
作者单位	1.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
推荐引用方式 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.