The near-solid wall multi-bubble cavitation is an extremely complex phenomenon, and cavitation has strong erosiveness. The melting point (about 3410 °C) of tungsten is highest among all pure metals, and its hardness is also very high (its yield strength is greater than 1 GPa). What would happen to pure tungsten wire under extreme conditions caused by collapsing cavitation bubbles at high hydrostatic pressure? In this paper, we have studied the fracture process of pure tungsten wire with diameter of 0.2 mm mounted at the focus of a standing acoustic wave produced by a spherical cavity transducer with two open ends placed in a near spherical pressure container, and also studied the macro and micro morphological characteristics of the fracture and the surface damage at different fracture stages of tungsten wire under various hydrostatic pressures and driving electric powers. The results have shown that the fracture time of tungsten wire is inversely proportional to avitation intensity with hydrostatic pressure and driving electric power, the higher the acoustic pressure caused by higher electric power, the shorter the fracture time. The possible fracture mechanisms of tungsten wire in this situation we found mainly contributed to asymmetrically bubbles collapse near the surface of tungsten wire, leading to tearing the surface apart; consequently cracks along the radial and axial directions of a tungsten wire extend simultaneously, classified as trans-granular fracture and inter-granular fracture, respectively. With the increase of cavitation intensity, the cracks tend to extend more radially and the axial crack propagation path becomes shorter, that is, mainly for trans-granular fracture; with the decrease of cavitation intensity, intergranular fracture becomes more obvious. When the hydrostatic pressure was 10 MPa and the driving electric power was 2 kW, the fibers became softener due to the fracture of the tungsten wire. The fracture caused by acoustic cavitation was different from conventional mechanical fracture, such as tensile, shear, fatigue fracture, on macro and micro morphology.

接近实心壁的多气泡空化是一种极其复杂的现象，并且空化具有很强的侵蚀性。在所有纯金属中，钨的熔点（约3410°C）最高，其硬度也很高（屈服强度大于1 GPa）。在高静水压力下，空化气泡破裂会导致极端条件下的纯钨丝发生什么情况？在本文中，我们研究了直径为0.2 mm的纯钨丝的断裂过程，该直径固定在由两个开口端放在近球形压力容器中的球形腔换能器产生的驻声波的焦点处，并研究了在不同静水压力和驱动功率下钨丝不同断裂阶段的断口宏观和微观形态特征以及表面损伤。结果表明，钨丝的断裂时间与静水压力和驱动功率的激发强度成反比，较高功率引起的声压越高，断裂时间越短。我们发现在这种情况下钨丝可能的断裂机理主要是导致钨丝表面附近的气泡不对称塌陷，导致表面破裂。因此，沿钨丝径向和轴向的裂纹同时扩展，分为跨晶断裂和晶间断裂，分别。随着空化强度的增加，裂纹趋向于径向扩展，轴向裂纹的传播路径变短，这主要是针对跨晶断裂。随着空化强度的降低，晶间断裂变得更加明显。当静水压为10MPa且驱动功率为2kW时，由于钨丝的断裂，纤维变得柔软。由声空化引起的断裂在宏观和微观形态上不同于常规的机械断裂，例如拉伸，剪切，疲劳断裂。晶间骨折变得更加明显。当静水压为10MPa且驱动功率为2kW时，由于钨丝的断裂，纤维变得柔软。由声空化引起的断裂在宏观和微观形态上不同于常规的机械断裂，例如拉伸，剪切，疲劳断裂。晶间骨折变得更加明显。当静水压为10MPa且驱动电力为2kW时，由于钨丝的断裂，纤维变得柔软。由声空化引起的断裂在宏观和微观形态上不同于常规的机械断裂，例如拉伸，剪切，疲劳断裂。