Non-destructive measurement of Young’s modulus for intermetallic compound phase through Brillouin light scattering
(1. School of Materials and Energy, Lanzhou University, Lanzhou 730000, China;
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
3. Lanzhou Jinchuan Technology Park Co., Ltd., Lanzhou 730101, China;
4. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China)
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
3. Lanzhou Jinchuan Technology Park Co., Ltd., Lanzhou 730101, China;
4. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China)
Abstract: Different from the current measurement methods for Young’s modulus of metal materials, the Young’s modulus of intermetallic compounds (IMCs) was obtained by a non-destructive method based on Brillouin light scattering (BLS) in this paper. The single-phase regions of CoSn, CoSn2, Cu3Sn and Cu6Sn5 phases required for BLS test were obtained by applying long-term thermal stabilization through adjusting temperature gradient. The volume fractions of the corresponding phases near the solid-liquid interfaces of the samples were 98.3%, 94.2%, 99.6% and 95.9%, respectively. All the independent elastic coefficients and Young’s moduli of IMCs were obtained by Brillouin scatterometer. The Young’s moduli of CoSn, CoSn2 and Cu3Sn and Cu6Sn5 phases obtained through the present method are 115.0, 101.7, 129.9 and 125.6 GPa, respectively, which are in a good agreement with the previous experimental results. Thus, the effectiveness of BLS in measuring the Young’s moduli of IMCs in bulk alloys is confirmed.
Key words: Brillouin light scattering; intermetallic compound; elastic stiffness tensor; thermal stabilization; Young’s modulus