首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses
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Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses

机译:加载速率,缺口根半径和试样厚度对块状金属玻璃断裂韧性的影响

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The fracture toughness (K_Q) tests were carried out in order to study the effect of loading rate (K), notch root radius ? and specimen thickness (B) on the K_Q in Zr-based bulk glassy alloys (BGAs). The plane strain fracture toughness K_(IC) of the BMG of Zr_(50)Cu_(40)Ni_(10) at.% prepared by an arc tilt casting method showed a large value of 53 Mpa m~(1/2) under the conditions satisfying ASTM E399. With K of about 0.1 Mpam~(1/2) s~(-1), there were cases that the K_Q exhibited more than 100 MPa m~(1/2). The K_Q increased with increasing R even for smaller R of 30 μm and K_Q exhibited more than 120 MPam~(1/2) with R of more than 90 μm. K_Q decreases a little with decreasing the B from 2.3 to 0.12 mm was shown. In these cases, the estimated plane stress plastic zone sizes agreed well with the length of shear bands near the fatigue crack tips or notch roots on specimen surfaces.
机译:进行断裂韧性(K_Q)试验以研究加载速率(K),缺口根半径Zr基块状玻璃合金(BGA)中K_Q上的样品厚度(B)。通过电弧倾斜铸造法制备的Zr_(50)Cu_(40)Ni_(10)at。%的BMG的平面应变断裂韧性K_(IC)显示出53 Mpa m〜(1/2)的大值满足ASTM E399的条件。当K约为0.1 Mpam〜(1/2)s〜(-1)时,K_Q表现出大于100 MPa m〜(1/2)的情况。即使较小的R为30μm,K_Q随R的增加而增加,K_Q表现出大于120 MPam〜(1/2),R大于90μm。如图所示,K_Q随B从2.3减小到0.12 mm而略有下降。在这些情况下,估计的平面应力塑性区大小与疲劳裂纹尖端或试样表面上的缺口根附近的剪切带长度非常吻合。

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