Precipitation behavior and strengthening-toughening mechanism of hot rolled sheet of Ti65 titanium alloy during aging process

被引：51

作者：

Zhang, Zhixin ^{[1
,3
]}

Fan, Jiangkun ^{[1
,2
]}

Wu, Zhihong ^{[1
]}

Zhao, Ding ^{[1
]}

Gao, Qi ^{[3
]}

Wang, Qinbo ^{[3
]}

Chen, Zhiyong ^{[4
]}

Tang, Bin ^{[1
,2
]}

Kou, Hongchao ^{[1
,2
]}

Li, Jinshan ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Natl & Local Joint Engn Res Ctr Precis Thermoform, Xian 710072, Shaanxi, Peoples R China

[3] Baoti Grp Ltd, Baoji 721014, Shaanxi, Peoples R China

[4] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 831卷

基金：

中国国家自然科学基金;

关键词：

Titanium alloy; Mechanical property; Phase transformation; Silicide; Strengthening and toughening; TENSILE PROPERTIES; ROOM-TEMPERATURE; LATTICE STRAIN; EVOLUTION; MICROSTRUCTURE; TRANSFORMATION; DUCTILITY; EXPOSURE; TI3AL; CAST;

D O I：

10.1016/j.jallcom.2020.154786

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Although the addition of various alloying elements to the near a alloy improves the high temperature service performance, the plasticity is always unsatisfactory while the strength is increased. In the present work, the strength and ductility of the Ti65 alloy sheet are successfully improved simultaneously by optimizing the aging heat treatment process. The effect of aging heat treatment on microstructure, precipitation behavior and tensile property of Ti65 alloy sheet has been investigated by contrast tests of the sheets before and after aging. The results reveal that the ratio of equiaxed alpha(p) to lamellar alpha(s) varies, two kinds of (TiZr)(6)Si-3 silicide (globular and interfacial silicide) precipitate at different position and the interface transforms to be discontinuous during aging process. Besides, the strength and ductility of Ti65 alloy sheet are improved simultaneously during tensile tests after aging at 700 degrees C. The ultimate tensile strength and elongation strain gets 4.9% and 123.8% increase, respectively. The strengthening of the aged Ti65 alloy sheet is mainly attributed to the precipitation of the interfacial silicide (TiZr)(3)Si and Ti3Al. The significant improvement in ductility should benefit from the optimization of the ratios of the equiaxed alpha(p) and lamellar alpha(s), and the formation of discontinuous lamellae interface. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：9

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