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学术报告:Diffusivity Analysis and Microstructural Characterization within β-Ti Alloys using Diffusion Multiple Approach
发布时间:2016/12/10 14:58                  浏览次数:683 次 

报告时间:20161220日,上午10

 

报告地点:三一大楼409会议室

 

报告人:陈章麒博士(美国俄亥俄州立大学)

 

报告人简介:陈章麒,美国俄亥俄州立大学在读博士研究生。本科毕业于中国科技大学少年班。本科毕业后即赴美国留学,师从赵继成教授。博士研究主要是利用扩散多元节这一高通量实验方法来进行低模量生物医用钛合金的研究。主要研究内容包含:钛合金关键体系相图和扩散系数的测定;微区性能(硬度、弹性模量、热容、热导率等)快速测试与表征;钛合金体系中马氏体相变研究。

 

报告摘要:The current generation of bio-compatible titanium alloys still have a relatively higher Young's modulus than that of human bones. Additional elements of the β stabilizers ( Mo, Nb, Ta, etc.) as well as the neutral elements (Hf, Sn, Zr etc.) have shown in the literature to further decrease the modulus and balance the properties of the alloys. In this work, high-throughput diffusion multiples (Ti-Mo-Nb-Ta-Zr) were made to study the diffusion coefficients in the bcc phase of the Ti-X (X = Mo, Nb, Ta, Zr) binary systems. For systems like Ti-Ta/Mo/Nb, diffusivity nearby pure Ta/Mo/Nb is unreliable, which is always orders of magnitude higher than tracer experimental results. The compositional range of reliable data can be determined from a critical concentration gradient value. Modulus mapping through nanoidentation were performed to show the common behavior in Ti-X systems. Furthermore, TEM were employed to reveal the composition dependence of microstructures in the diffusion regions of the Ti-X systems.

 

 

 

 

 

 

 

 

 

 

 

 

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