TY - JOUR
T1 - Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses
AU - Fujita, Kazutaka
AU - Okamoto, Akinori
AU - Nishiyama, Nobuyuki
AU - Yokoyama, Yoshihiko
AU - Kimura, Hisamichi
AU - Inoue, Akihisa
N1 - Funding Information:
This work was funded by a Grant-in-Aid for Scientific Research (A) from the Japan Society for the promotion for Science and a Grant-in-Aid for Scientific Research on Priority Areas (Material Science of Bulk Metallic Glasses) from the Ministry of Education, Culture, Sports, Science and Technology. It was performed under the inter-university cooperative research program of Metallic Glasses Research Centre, IMR.
PY - 2007/5/31
Y1 - 2007/5/31
N2 - The fracture toughness (KQ) tests were carried out in order to study the effect of loading rate (over(K, ̇)), notch root radius (R) and specimen thickness (B) on the KQ in Zr-based bulk glassy alloys (BGAs). The plane strain fracture toughness KIC of the BMG of Zr50Cu40Ni10 at.% prepared by an arc tilt casting method showed a large value of 53 MPa m1/2 under the conditions satisfying ASTM E399. With over(K, ̇) of about 0.1 MPa m1/2 s-1, there were cases that the KQ exhibited more than 100 MPa m1/2. The KQ increased with increasing R even for smaller R of 30 μm, and KQ exhibited more than 120 MPa m1/2 with R of more than 90 μm. KQ 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.
AB - The fracture toughness (KQ) tests were carried out in order to study the effect of loading rate (over(K, ̇)), notch root radius (R) and specimen thickness (B) on the KQ in Zr-based bulk glassy alloys (BGAs). The plane strain fracture toughness KIC of the BMG of Zr50Cu40Ni10 at.% prepared by an arc tilt casting method showed a large value of 53 MPa m1/2 under the conditions satisfying ASTM E399. With over(K, ̇) of about 0.1 MPa m1/2 s-1, there were cases that the KQ exhibited more than 100 MPa m1/2. The KQ increased with increasing R even for smaller R of 30 μm, and KQ exhibited more than 120 MPa m1/2 with R of more than 90 μm. KQ 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.
KW - Amorphous materials
KW - Casting
KW - Scanning electron microscopy
KW - X-ray diffraction
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U2 - 10.1016/j.jallcom.2006.08.328
DO - 10.1016/j.jallcom.2006.08.328
M3 - Article
AN - SCOPUS:33947581036
VL - 434-435
SP - 22
EP - 27
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - SPEC. ISS.
ER -