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Experimental Study at the Phase Interface of a Single-Crystal Ni-Based Superalloy Using TEM
Hongye Zhang1,2, Huihui Wen2,3, Runlai Peng1
1School of Technology, Beijing Forestry University, Beijing 100083, China.
Materials (Basel, Switzerland)
|October 14, 2022
Summary
This study investigates the phase interface of single-crystal nickel-based superalloys using in-situ TEM. Findings reveal how interface width and strain fields correlate, offering insights into high-temperature material behavior and intermediate temperature brittleness.
Area of Science:
- Materials Science
- Metallurgy
- Solid State Physics
Background:
- Single-crystal Ni-based superalloys are critical for high-temperature applications like turbine blades.
- Understanding their phase interface behavior is crucial for improving performance and durability.
Purpose of the Study:
- To analyze the interface structure and strain fields in a second-generation single-crystal Ni-based superalloy.
- To investigate the temperature-dependent evolution of dislocation density near the phase interface.
- To explore the link between dislocation density changes and intermediate temperature brittleness.
Main Methods:
- In-situ transmission electron microscopy (TEM) at various temperatures.
- Intensity ratio analysis for two-phase interface width measurement.
- Geometric phase analysis (GPA) with adaptive mask selection for strain field mapping.
- Fourier transform analysis of TEM images to quantify dislocation density.
Main Results:
- The strained irregular transition region at the interface aligns with calculated interface widths.
- Intensity ratio analysis and strain measurements provide complementary data for interface evaluation.
- Dislocation density in the gamma phase initially decreases with temperature, then sharply increases around 450 °C.
Conclusions:
- Combined intensity ratio and strain analysis effectively evaluates interface structure.
- The observed changes in dislocation density correlate with intermediate temperature brittleness in Ni-based superalloys.
- This research provides critical data for the design and application of advanced superalloys.
