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首页> 外文期刊>Physica, C. Superconductivity and its applications >Crack propagation and acoustic emission behavior of silver-added Dy123 bulk superconductor
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Crack propagation and acoustic emission behavior of silver-added Dy123 bulk superconductor

机译：含银Dy123块状超导体的裂纹扩展和声发射行为

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摘要

The relationship between the crack propagation process and acoustic emission (AE) signals was investigated in 3-point bending tests in which stress loading was applied parallel to the c-axis of U-notched specimens cut from Dy123 bulk superconductors with and without the addition of silver (Ag). The average bending stress of the specimens containing 10 mass% of Ag was approximately 20% higher than that of the specimens without the addition of Ag; the total AE energy of the former specimens was approximately fourfold greater than that of the latter specimens. However, cracks initiated in all of the specimens at a bending stress level of around 25 MPa, regardless of the presence or absence of Ag. An analysis of the amplitude distribution revealed that the failure mode was matrix failure in both types of specimens. Cracks in the low-strength specimens without Ag propagated between gas holes or along cleavage planes, and the AE event count and total AE energy were low. By contrast, the high-strength Ag-added specimens had fewer gas holes and cleavage cracks on account of their improved microstructure. In these samples, crack propagation orthogonal to the cleavage planes caused Ag particles to separate from the matrix and induced cleavage cracks. The addition of Ag presumably had the effect of inhibiting crack propagation, with the result that the AE event count and AE energy increased.
机译：在三点弯曲试验中研究了裂纹扩展过程与声发射（AE）信号之间的关系，在这种试验中，在有和没有添加Dy123块状超导体的情况下，平行于从Dy123大块超导体上切下的U形缺口试样的c轴施加应力载荷。银（Ag）。含有10质量％的Ag的试样的平均弯曲应力比不添加Ag的试样的平均弯曲应力高约20％。前一个样品的总AE能量大约比后一个样品的四倍。但是，无论有无Ag，在25MPa左右的弯曲应力水平下，所有试样均产生裂纹。对幅度分布的分析表明，在两种类型的样本中，破坏模式均为基体破坏。没有银的低强度试样的裂纹在气孔之间或沿解理面传播，并且AE事件计数和总AE能量都较低。相比之下，由于添加了高强度Ag的样品具有改善的微观结构，因此它们的气孔和解理裂纹更少。在这些样品中，垂直于分裂平面的裂纹扩展导致Ag颗粒从基体上分离，并引起分裂裂纹。推测Ag的添加具有抑制裂纹扩展的效果，其结果是AE事件数和AE能量增加。

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