Surface softening mechanism based on microstructure analyses under ultrasonic impact condition for Ti-17 titanium alloy

IF 3.8 2区工程技术 Q2 ENGINEERING, MANUFACTURING

Advances in Manufacturing Pub Date : 2024-10-29 DOI:10.1007/s40436-024-00525-w

Chang-Feng Yao, Wen-Hao Tang, Liang Tan, Min-Chao Cui, Yun-Qi Sun, Tao Fan, Xu-Hang Gao

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Abstract

Ultrasonic impact significantly influences the mechanical properties and flow stress of Ti-17 titanium alloy. In this study, compression tests on Ti-17 titanium alloy were conducted under ultrasonic impact conditions, varying ultrasonic amplitudes and compression rates. The flow stress, surface elemental content, microhardness, and microstructure of Ti-17 titanium alloy were tested, and the softening mechanism of Ti-17 titanium alloy under ultrasonic impact conditions was investigated. The results indicate that the softening mechanism of Ti-17 titanium alloy involved ultrasonic softening combined with stress superposition. Ultrasonic impact leads to a higher distribution of grain orientation differences, alters the distribution of small-angle grain boundaries, and changes the distribution of surface phases, resulting in a reduced density of α phases. The geometrically necessary dislocation density at the surface increases, and the average grain size decreases from 2.91 μm to 2.73 μm. The Brass-type texture essentially disappears, transforming mainly into a Copper-type texture {112}<11-1>, with the maximum pole density decreasing from 73.98 to 39.88.

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基于超声冲击条件下Ti-17钛合金微观组织分析的表面软化机理

超声冲击对Ti-17钛合金的力学性能和流变应力有显著影响。在本研究中，对Ti-17钛合金在不同超声振幅和压缩率的冲击条件下进行了压缩试验。测试了Ti-17钛合金的流变应力、表面元素含量、显微硬度和显微组织，探讨了Ti-17钛合金在超声冲击条件下的软化机理。结果表明，Ti-17钛合金的软化机理是超声软化和应力叠加相结合。超声冲击导致晶粒取向差分布增大，改变了小角晶界分布，改变了表面相分布，导致α相密度降低。表面几何必需位错密度增大，平均晶粒尺寸从2.91 μm减小到2.73 μm。黄铜型织构基本消失，主要转变为铜型织构{112}<；11-1>，最大极密度从73.98下降到39.88。

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来源期刊

Advances in Manufacturing Materials Science-Polymers and Plastics

CiteScore

9.10

自引率

3.80%

发文量

274

期刊介绍： As an innovative, fundamental and scientific journal, Advances in Manufacturing aims to describe the latest regional and global research results and forefront developments in advanced manufacturing field. As such, it serves as an international platform for academic exchange between experts, scholars and researchers in this field. All articles in Advances in Manufacturing are peer reviewed. Respected scholars from the fields of advanced manufacturing fields will be invited to write some comments. We also encourage and give priority to research papers that have made major breakthroughs or innovations in the fundamental theory. The targeted fields include: manufacturing automation, mechatronics and robotics, precision manufacturing and control, micro-nano-manufacturing, green manufacturing, design in manufacturing, metallic and nonmetallic materials in manufacturing, metallurgical process, etc. The forms of articles include (but not limited to): academic articles, research reports, and general reviews.