High-strength dual-scale structure titanium alloy, preparation method therefor, and application thereof

US11072841B2 · kind B2 · utility

Assignee

• South China University of Technology · CN

Inventors

• Chao-Hui Yang · Qionghai, CN
• Yaguang Yao · 流花街道, CN
• Shengguan Qu · 流花街道, CN
• Xiaoqiang Li · Beijing, CN
• Weiwen Zhang · 流花街道, CN
• Yuanyuan Li · Beijing, CN

Key dates

• Filing date: Dec 20, 2016
• Grant date: Jul 27, 2021
• Expiry date: Jun 2, 2038

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2998/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high-strength dual-scale structure titanium alloy, a preparation method therefor, and an application thereof, belonging to the technical field of alloy processing. The composition system of the titanium alloy is Ti—Nb—Cu—Co—Al, the atomic percentage of the various elements being 58˜70% Ti, 9˜16% Nb, 4˜9% Cu, 4˜9% Co, and 2˜8% Al. The microstructure comprises a dual-scale coexistence of micro-crystal isometric bcc β-Ti and ultra-fine crystal isometric bcc β-Ti, and a dual-scale coexistence of micro-crystal strip fcc CoTi2 and ultra-fine crystal isometric fcc CoTi2, or an ultra-fine crystal strip fcc CoTi2 twin crystal is distributed along a boundary of a dual-scale substrate, the dual-scale substrate being a nano needle-shaped martensite a′ phase dispersed within micro-crystal bcc β-Ti. The mechanical properties of the titanium alloy are significantly improved, and the titanium alloy may be used in fields such as aerospace and aviation, weaponry and sports equipment.