Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses

Kazutaka Fujita; Akinori Okamoto; Nobuyuki Nishiyama; Yoshihiko Yokoyama; Hisamichi Kimura; Akihisa Inoue

doi:10.1016/j.jallcom.2006.08.328

Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses

Kazutaka Fujita, Akinori Okamoto, Nobuyuki Nishiyama, Yoshihiko Yokoyama, Hisamichi Kimura, Akihisa Inoue

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

The fracture toughness (K_Q) 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 K_Q in Zr-based bulk glassy alloys (BGAs). The plane strain fracture toughness K_IC of the BMG of Zr₅₀Cu₄₀Ni₁₀ 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 over(K, ̇) of about 0.1 MPa m^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 MPa m^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.

Original language	English
Pages (from-to)	22-27
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	434-435
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jallcom.2006.08.328
Publication status	Published - 2007 May 31
Externally published	Yes

Keywords

Amorphous materials
Casting
Scanning electron microscopy
X-ray diffraction

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses. / Fujita, Kazutaka; Okamoto, Akinori; Nishiyama, Nobuyuki; Yokoyama, Yoshihiko; Kimura, Hisamichi; Inoue, Akihisa.

In: Journal of Alloys and Compounds, Vol. 434-435, No. SPEC. ISS., 31.05.2007, p. 22-27.

Research output: Contribution to journal › Article › peer-review

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title = "Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses",

abstract = "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.",

keywords = "Amorphous materials, Casting, Scanning electron microscopy, X-ray diffraction",

author = "Kazutaka Fujita and Akinori Okamoto and Nobuyuki Nishiyama and Yoshihiko Yokoyama and Hisamichi Kimura and Akihisa Inoue",

note = "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.",

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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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Effects of loading rates, notch root radius and specimen thickness on fracture toughness in bulk metallic glasses

Abstract

Keywords

ASJC Scopus subject areas

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