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Recently, the Li Faxin research group of the School of Engineering of Peking University has developed the world's first Dynamic Mechanical Analyzer (DMA) suitable for hard materials (metals, ceramics, etc.
Figure 1 Hard material DMA based on electromechanical impedance method and its automatic measurement software interface
Modulus and internal friction (or damping) is the basic physical properties of all solid material, which can change with temperature accurately reflects the evolution of the interior of the material, such as atomic diffusion, grain boundary sliding, solid state phase transition
Li Faxin’s research group proposed a modulus and internal friction measurement method based on the electromechanical impedance method, which can accurately and quickly measure the Young’s modulus, shear modulus and corresponding internal friction of materials ( Rev Sci Instrum 2020, Editor's Pick, https://doi .
Using this new DMA, the research team obtained the grain boundary sliding internal friction peak (Ge Feng) in polycrystalline pure aluminum under high frequency vibration (tens of kHz) for the first time.
Figure 2 shows the results of measuring the modulus and internal friction of the TC4 titanium alloy from room temperature to 1200 ° C using the new DMA
Figure 2 Modulus and internal friction temperature spectrum of TC4 titanium alloy from room temperature to 1200°C
