Effects of heat treatment on microstructure evolution and mechanical properties of Ti-22Al-24Nb-0.5Mo alloy

doi:10.1016/j.msea.2022.144052

IMR OpenIR

	Effects of heat treatment on microstructure evolution and mechanical properties of Ti-22Al-24Nb-0.5Mo alloy
	Li, N.1,2; Zhao, Z. B.1; Sun, H.1,2; Zhou, T. Y.1,2; Wang, Q. J.1; Yang, J. X.1; Liu, Y. H.1,2; Zhang, B. H.1,2
通讯作者	Zhao, Z. B.(zbzhao@imr.ac.cn)
	2022-11-01
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	857 页码:10
摘要	In this study, microstructure evolution, tensile and fracture behaviors of Ti-22Al-24Nb-0.5Mo alloy processed under different heat treatment processing routes were investigated systematically. The results revealed the ex-istence of bimodal-size microstructures of the primary O lamellae and the secondary acicular O phase. The strength and ductility of alloy specimens were optimized by accommodating the volume fractions and mor-phologies of the precipitates. With the increase of the solution temperature, more acicular O phase precipitated out, which led to the increase of the yield strength and ultimate tensile strength. It was observed that the acicular O phase led to the increase of the strength at elevated temperature without sacrificing plasticity. Owing to the improvement of microscopic strain homogeneity under coupled actions of stress and high temperature, the tensile fracture mode changed from quasi-cleavage to ductile transgranular creep fracture. The fracture tough-ness of this alloy was determined by the B2 phase and the acicular O phase. It was evaluated that the fracture toughness reduced with a higher volume fraction of the acicular O phase, which in turn affected the contiguity of the B2 matrix. Considering this, balanced strength and toughness were achieved by tailoring the relative contents of the B2 and acicular O phase.
关键词	Ti2AlNb-Based alloy Heat treatment Microstructures Tensile properties Fracture toughness
资助者	National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
DOI	10.1016/j.msea.2022.144052
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; [51801213] ; [2020193]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000875721200002
出版者	ELSEVIER SCIENCE SA
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/321006/176348
专题	中国科学院金属研究所
通讯作者	Zhao, Z. B.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li, N.,Zhao, Z. B.,Sun, H.,et al. Effects of heat treatment on microstructure evolution and mechanical properties of Ti-22Al-24Nb-0.5Mo alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,857:10.
APA	Li, N..,Zhao, Z. B..,Sun, H..,Zhou, T. Y..,Wang, Q. J..,...&Zhang, B. H..(2022).Effects of heat treatment on microstructure evolution and mechanical properties of Ti-22Al-24Nb-0.5Mo alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,857,10.
MLA	Li, N.,et al."Effects of heat treatment on microstructure evolution and mechanical properties of Ti-22Al-24Nb-0.5Mo alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 857(2022):10.