Formation of lamellar microstructure in Ti-48Al-7Nb-2.5V-1Cr alloy

被引：5

作者：

Yu, Yonghao ^{[1
]}

Kou, Hongchao ^{[1
]}

Wang, William Yi ^{[1
]}

Wang, Yichao ^{[1
]}

Qiang, Fengming ^{[1
]}

Zou, Chengxiong ^{[1
]}

Li, Jinshan ^{[1
]}

机构：

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

来源：

MATERIALS & DESIGN | 2022年 / 224卷

关键词：

TiAl alloy; Lamellar microstructure; Spinodal decomposition; Compositional modulation; Long-period superstructure; MASSIVE TRANSFORMATION; PHASE-TRANSFORMATIONS; SINGLE-CRYSTAL; TI; NUCLEATION; DIFFUSION; MECHANISM; STRENGTH; ORDER; GD;

D O I：

10.1016/j.matdes.2022.111342

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The reasonable design and application of phase transformation is an efficient approach to coordinate the microstructure and properties of alloys. The sequence of compositional and structural transformation determines the type and mechanism of phase transformation. Because of their low density and excellent high-temperature properties, TiAl alloys that contain fully lamellar microstructure have been applied to low-pressure turbine engine blades. However, there is no consensus on the mechanism of lamellar formation. Here, we propose a new mechanism that is dominated by spinodal decomposition, in which compositional transformation occurs prior to structural transformation during lamellar formation. Transitional lamellae with fcc-based long-period superstructures are introduced to prove the mechanism of sequentially spinodal decomposition, shear transformation, compositional modulation and ordering. (C) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页数：11

共 56 条

[41] Theoretical Study on the Structural, Elastic, Electronic and Thermodynamic Properties of Long-Period Superstructures h- and r-Al2Ti under High Pressure [J].