Enhancement of room-temperature mechanical properties of TiAl alloy by trace addition of C

被引：15

作者：

Cao, Jun ^{[1
]}

Sun, Tielong ^{[1
]}

Guo, Zhichao ^{[1
]}

Yang, Gang ^{[1
]}

Liang, Yongfeng ^{[1
]}

Lin, Junpin ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 884卷

基金：

中国国家自然科学基金;

关键词：

Titanium aluminides; C microalloying; Mechanical properties; Microstructure; Microcracking; INTERMETALLIC ALLOYS; CARBON ADDITION; GAMMA; DESIGN; MICROSTRUCTURE; TURBOCHARGER; SOLUBILITY; BEHAVIOR; CAST;

D O I：

10.1016/j.msea.2023.145598

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Lightweight and high-temperature-resistant gamma-TiAl based alloys have attracted considerable research attention for application in aerospace and automotive engines. For TiAl alloys, C alloying is usually beneficial for improving the high-temperature mechanical properties, while deteriorates the room-temperature (RT) mechanical properties, particularly the plasticity. This study demonstrates that trace C alloying can significantly improve the RT mechanical properties of a cast Ti-46Al-6Nb alloy. The initiation and propagation of microscopic cracks during three-point bending with and without C microalloying were analyzed. A comprehensive effect that involves segregation, phase content, hardness, lamellar spacing, and lamellar interface improvement is proposed for the simultaneous enhancement of the strength and plasticity with trace C addition. This study offers an accurate and feasible strategy to utilize the solid-solution strengthening of interstitial C in TiAl alloys.

引用

页数：9

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