About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Evaluation Method of Ductile-to-Brittle Transition Temperature Using Nano-indentation and Molecular Dynamics Simulation |
Author(s) |
Yeonju Oh, Won-Seok Ko, Nojun Kwak, Takahito Ohmura, Heung Nam Han |
On-Site Speaker (Planned) |
Yeonju Oh |
Abstract Scope |
Tungsten has emerged as a promising material for use in a variety of high-temperature applications; however, the characterization of its ductile-to-brittle transition is currently limited to large scale scenarios and destructive testing. In this presentation, we propose a novel non-destructive method to evaluate the ductile-to-brittle transition temperature (DBTT) of pure tungsten at extremely small scales. The new concept is based on constructing a practical Yoffee diagram where the effective yield stress is evaluated from pop-in behavior during nano-indentation, and the brittle fracture stress is calculated on the basis of MD simulation. Experimental validation has been made by tensile test confirming the availability of the proposed method as an engineering tool to estimate the DBTT. Based on the new method, we’ve examined the DBTT variation of four tungsten specimens with different degree of deformation. Further details on microstructure dependence of DBTT in tungsten would be discussed in terms of dislocation characters. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Other |