{10 1 over line 2} twinning induced by the interaction between {11 2 over line 1} twin and β phase in α plus β Ti alloys

被引：14

作者：

Zheng, Xiaodong ^{[1
,2
]}

Liu, Guisen ^{[4
]}

Zheng, Shijian ^{[1
,2
]}

Ma, Yingjie ^{[3
]}

Yang, Rui ^{[3
]}

Wang, Jian ^{[5
]}

Ma, Xiuliang ^{[2
,6
]}

机构：

[1] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Mat Laminating Fabricat & Interfa, Tianjin 300130, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

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

[4] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[5] Univ Nebraska, Mech & Mat Engn, Lincoln, NE 68588 USA

[6] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China

来源：

ACTA MATERIALIA | 2022年 / 231卷

基金：

中国国家自然科学基金;

关键词：

Ti alloys; {10 1 over bar 2} twin; {11 2 over bar 1} twin; Interface; Transmission electron microscopy; ROOM-TEMPERATURE DEFORMATION; CRYSTAL PLASTICITY; SLIP TRANSMISSION; BIMETAL INTERFACES; LAMELLAR STRUCTURE; STRAIN-RATE; MECHANISMS; TI-6AL-4V; GRAIN; BOUNDARY;

D O I：

10.1016/j.actamat.2022.117900

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Severe plastic deformation induces numerous deformation twins in fully lamellar alpha+ beta Ti alloys. Interaction between deformation twins and beta phase brings a strong strengthening effect, however, the twinning transfer mechanism across alpha/ beta interface is still unclear. In this work, we report the interaction behavior and transfer mechanism of {11 2 over line 1} twin across alpha/ beta interface. Different from the common case that twinning strain transferred by plastic deformation of beta phase, the interaction between {11 2 over line 1} twin and beta phase induces {10 1 over line 2} twinning around the interaction area and the beta phase is free of plastic deformation. Experiments show that {10 1 over line 2} twins will nucleate in four quadrants of the intersection between {11 2 over line 1} twin and beta phase when the beta phase is thicker, whereas {10 1 over line 2} twins will only nucleate in one pair of diagonal quadrants of the intersection when the beta phase is thinner. The reason is that the strain field around the intersection between {11 2 over line 1} twin and beta phase is correlated with the thickness of beta phase, which ultimately determines where {10 1 over line 2} twins nucleate. Moreover, transmission electron microscopy (TEM) investigations reveal that the beta phase will block the motivation of {11 2 over line 1} twinning dislocation b { 11 2 over line 1 } t . In this situation, the twinning transfer of {11 2 over line 1} twin through the beta phase is accomplished with the help of elastic deformation of beta phase and nucleation of sequential {10 1 over line 2} twins. The {10 1 over line 2} twinning is facilitated by the dissociation of b { 11 2 over line 1 } t dislocations at the alpha/ beta interface promoted by the {11 2 over line 1} twinning shear stress field at the interaction area. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：13

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