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

IMR OpenIR

	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
通讯作者	Liu Dong(dliu@imr.ac.cn)
	2020-07-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	56 期号:7 页码:979-987
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.
关键词	beta solidifying gamma-TiAl alloy hot canned extrusion deformation microstructure tensile property
资助者	National Natural Science Foundation of China
DOI	10.11900/0412.1961.2019.00388
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51701209]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000538639000006
出版者	SCIENCE PRESS
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/139059
专题	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.