Determination method for elastic constants of monocrystalline high temperature alloy

Abstract

The invention discloses a determination method for elastic constants of monocrystalline high temperature alloy, and belongs to the technical field of physical parameter determination of monocrystalline alloy. According to the method, two types of monocrystalline high temperature alloy plates with specific 3D orientations are prepared by a seed crystal method, first and second orientations of the first type of monocrystalline plate are (001) and (100) respectively, and first and second orientations of the second type of monocrystalline plate are (011) and (110) respectively. A rectangular elastic modulus sample whose length direction is in parallel with the primary orientation of the monocrystalline plate is cut from a material plate, and the young modulus E (001) and the shear modulus G(001)-(100) of the first type of sample and the shear modulus G (011)-(110) of the second type of sample are measured by a knock resonance method. The three elastic constants C11, C12 and C44 of the monocrystalline high temperature alloy can be simply calculated from the measured young modulus and two shear modulus.

Description

technical field [0001] The invention relates to the technical field of measuring physical property parameters of single crystal alloys, in particular to a method for measuring elastic constants of cubic single crystal superalloys at different temperatures. Background technique [0002] Single crystal superalloys have a cubic crystal structure, and the most notable feature is anisotropy. The alloy has significant differences in Young's modulus and shear modulus along each crystal direction, while the bending frequency of single crystal and torsional frequency depend on the alloy's Young's modulus and shear modulus, respectively, so the vibration analysis of a single crystal blade must determine the modulus values ​​corresponding to its crystal orientation. Stress analysis of anisotropic single crystal superalloys must also fully understand the elastic properties of the alloy. A comprehensive description of the elastic properties of single crystal superalloys requires three el...

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Problems solved by technology

[0003] At present, the Poisson's ratio of single crystal alloy is measured by laser interference moiré method, and the testing process and data processing process are complicated.

During the measurement process, it is necessary to prepare a Poisson’s ratio sample with a large size and a relatively complex shape. The size of the material plate required for processing the sample is large, and it is easy to form miscellaneous crystals. The preparation is difficult, and the processing of samples with complex shapes is also difficult.

The test process of measuring the Poisson's ratio of the sample by laser moiré interferometry is relatively complicated. The data processing needs to identify and count the interference moiré. Matrix inversion operation to get the final elastic constant

Therefore, the process of using the existing method for calculating the elastic constant of single crystal alloy is complicated and difficult

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