Abstract—To determine the cracking susceptibility for amorphous metal alloys (AMAs) or metallic glasses, a method based on the determining the dependence of the relative crack resistance (χ) on the load applied to intender of PMT-3 microhardness tester is proposed. In the method, the relative crack resistance at a load of 160 g is set equal to unit. At lower loads, crack resistance has been determined as the average of 10 measurements. In this article, we also have proposed a method for determining the heating temperature of AMA ribbons during laser beam machining that is based on a comparison of the dependence of the relative crack resistance of AMAs on load applied to indenter for samples annealed in the furnace and after laser irradiation. It has been found that cracks begin to appear in the samples after a ten-minute annealing at Т = 773 K.Fatigue tests of samples under a load varying from a maximum value of 750 MPa to a minimum of 400 MPa under a condition of repeated stress cycle with a frequency of 2 Hz have been carried out using a specially designed setup. In the domain exposed to laser radiation, four characteristic areas can be distinguished on the sample surface: internal reflow zone; dendritic growth area; area with unfinished growth of dendrites, area not exposed to radiation. In these areas, the relative crack resistance (χ) determined via the critical stress intensity factor of the first kind K_1c monotonically decreases from 1 in the center to 0 at the periphery. It has been established that the laser action does not affect fatigue, the fatigue limit of the samples remains the same and is equal to 428 MPa. The characteristic features of the destruction are revealed. Cracks that propagate with branching in the reflow zone and after passing through its boundary develop rectilinearly have been found.

中文翻译：

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金属玻璃在局部载荷下和外部作用后的行为

摘要-为了确定非晶态金属合金（AMA）或金属玻璃的开裂敏感性，提出了一种基于确定相对开裂抗力（χ）对PMT-3微硬度测试仪施加的载荷的依赖性的方法。在该方法中，将160 g载荷下的相对抗裂性设置为等于单位。在较低的负载下，抗裂性已确定为10次测量的平均值。在本文中，我们还提出了一种确定AMA激光加工过程中AMA带的加热温度的方法，该方法基于AMA的相对抗裂性与炉内退火样品施加到压头上的负载的相关性的比较。激光照射后。已经发现，在10分钟的退火温度下，样品中开始出现裂纹。Т = 773 K.使用特殊设计的装置在频率为2 Hz的重复应力循环条件下进行了从最大750 MPa到最小400 MPa的载荷下的样品疲劳试验。在暴露于激光辐射的区域中，可以在样品表面上区分出四个特征区域：内部回流区；树突生长面积 树突未完成生长的区域，未暴露于辐射的区域。在这些区域中，通过第一类临界应力强度因子K _{1 c}确定相对抗裂性（χ）从中心的1单调减少到外围的0。已经确定，激光作用不会影响疲劳，样品的疲劳极限保持不变，等于428 MPa。揭示了破坏的特征。已发现裂纹在回流区以分支方式传播，并在穿过其边界后呈直线发展。