Ultrasonic nonlinear evaluation of tensile plastic damage in Nickel based single crystal superalloy

材料科学 极限抗拉强度 高温合金 位错 复合材料 可塑性 超声波传感器 透射电子显微镜 衍射 单晶 打滑(空气动力学) 冶金 微观结构 结晶学 光学 声学 热力学 纳米技术 物理 化学
作者
J.J. Wang,Zhixun Wen,Haiqing Pei,C.J. Zhang,Y.M. Zhang,Z.F. Yue
出处
期刊:NDT & E international [Elsevier BV]
卷期号:129: 102648-102648 被引量:7
标识
DOI:10.1016/j.ndteint.2022.102648
摘要

The tensile interruption tests of Nickel-based single crystal (NBSX) superalloys at room temperature were carried out to artificially introduce controllable levels of plastic damage, and linear and nonlinear ultrasonic nondestructive methods were used to evaluate it. The results indicate that ultrasonic nonlinear parameter β shows hypersensitivity to early tensile plastic damage compared with traditional linear parameters. Transmission electron microscope (TEM) and X-ray diffraction (XRD) measurements of dislocation string length and dislocation density were conducted to calculate the theoretical predicted values of β by ultrasonic nonlinearity dislocation monopole model, and they are in well agreement with experimental results. In addition, the actuation of slip systems and evolution of dislocation configuration were observed under optical microscope (OM) and TEM. From the perspective of element distribution and energy, it is revealed that the plastic deformation mechanism of the NBSX superalloys at room temperature is anti-phase boundary (APB) dislocation pairs shear γ′ phase. The measurement results of macro mechanical properties manifested that accumulative tensile plastic deformation lead to increase of strength and decrease of plasticity. • Tensile interruption tests of nickel-based single crystal superalloys were conducted. • The microstructure evolution of materials was quantitatively studied by TEM and XRD. • The changes of strength and plasticity of materials during tensile plastic damage were measured. • The tensile plastic damage degree was evaluated using ultrasonic linear and nonlinear methods. • The variation of nonlinear parameter was explained by ultrasonic nonlinear dislocation string model.
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