Atomic-scale understanding of the γ/α2 interface in a TiAl alloy

被引：19

作者：

Wang, Xiaodong ^{[1
,2
]}

Shen, Yidi ^{[3
]}

Song, Shuangxi ^{[1
]}

Liu, Pan ^{[1
,2
]}

An, Qi ^{[3
]}

Reddy, Kolan Madhav ^{[1
]}

机构：

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

[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China

[3] Univ Nevada, Chem & Mat Engn Dept, Reno, NV 89557 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 846卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

TiAl alloy; Eutectoid reaction; Interface; Transmission electron microscopy; Density functional theory; TOTAL-ENERGY CALCULATIONS; DEFORMATION MECHANISMS; BEHAVIOR;

D O I：

10.1016/j.jallcom.2020.156381

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：

The eutectoid reaction often produces lamellar structure of two alternating phases, which exhibits promising mechanical properties because of high density interfaces. However, the atomic-level understanding of these interfacial structures remains controversial. Here we report the atomic structure of gamma/alpha(2) interface in a fully lamellar TiAl alloy investigated by the aberration corrected transmission electron microscopy and density functional theory (DFT) simulations. The results reveal that the orientation relationship between alpha(2)/gamma interface in TiAl alloy always follows (0001)(alpha 2)parallel to{111}(gamma) and < 11-20 >(alpha 2)parallel to < 1-10 >(gamma) with a semi-coherent lattice match due to the ultralow interfacial energy predicated by DFT calculation. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：6

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