Fabrication, Structure and Mechanical and Ultrasonic Properties of Medical Ti6Al4V Alloys Part I: Microstructure and Mechanical Properties of Ti6Al4V Alloys Suitable for Ultrasonic Scalpel
Fabrication, Structure and Mechanical and Ultrasonic Properties of Medical Ti6Al4V Alloys Part I: Microstructure and Mechanical Properties of Ti6Al4V Alloys Suitable for Ultrasonic Scalpel
复制标题
医用Ti6Al4V合金的制备、组织及力学和超声性能第一部分：适用于超声刀的Ti6Al4V合金的显微组织和力学性能
DOI：
10.3390/ma13020478
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发表时间：
2020-01-02
期刊：
影响因子：
3.4
通讯作者：
Liu, Shaojun
中科院分区：
文献类型：
--
作者：
He, Zheyu;He, Hao;Liu, Shaojun
Ti6Al4V合金被认为是超声刀的关键部件。本文系统地研究了医用超声刀用Ti6Al4V合金的制备工艺、组织结构、力学性能和超声性能。这些合金具有较低的弹性模量，并呈现出典型的双峰微观结构，β相含量相对较高（约40%），片层α厚度≤ 0.9 µm。在第一篇论文中，讨论了热轧Ti6Al4V合金经热处理后的显微组织与力学性能之间的关系。在第二篇论文中，报道了热处理Ti6 Al 4V合金的超声性能与显微组织的关系。随着固溶温度的升高，初生α相的含量和尺寸减小。相比之下，片状α相的含量和尺寸增加。此外，β相含量先增加后减少。时效处理可使Ti6Al4V合金的显微组织发生轻微变化。当固溶处理温度从960 °C升高到980 °C时，合金中的层状α相的平均尺寸增加了1.1 μm。这导致平均屈服强度（93 MPa）降低。合金的弹性模量主要由β相含量控制。在960 °C固溶处理的合金中，β相含量最高，平均弹性模量最低，为99.69 GPa，在41.25 mm处的共振频率最低，为55.06 kHz，平均振幅最高，为21.48 µm。
Ti6Al4V alloy has been considered as a key component used in ultrasonic scalpels. In this series of papers, the fabrication, structure, and mechanical and ultrasonic properties of medical Ti6Al4V alloys suitable for ultrasonic scalpel are studied systemically. These alloys with low elastic modulus and present a typical bimodal microstructure with relatively high β phase content (~40%) and lamellar α thickness of ≤ 0.9 µm. In the first paper, the relationship between the microstructure and mechanical properties of hot-rolled Ti6Al4V alloys treated by heating treatment is discussed. In the second paper, the dependence of the ultrasonic properties on the microstructure of the heat-treated Ti6Al4V alloys is reported. With increasing solid solution temperature, the content and size of the primary α phase decrease. In contrast, the content and size of the lamellar α phase increase. Additionally, the β phase content first increases and then decreases. The microstructure of Ti6Al4V alloys could be slightly changed by aging treatment. When the solid solution treatment temperature increases to 980 °C from 960 °C, the average size of the lamellar α phase in the alloys increases by 1.1 µm. This results in a decrease in the average yield strength (93 MPa). The elastic modulus of alloys is mainly controlled by the β phase content. The microstructure of alloys by solution-treatment at 960 °C shows the highest β phase content and lowest average elastic modulus of 99.69 GPa, resulting in the minimum resonant frequency (55.06 kHz) and the highest average amplitude (21.48 µm) of the alloys at the length of 41.25 mm.