Effect of Ni addition on fatigue properties of bulk glassy Zr 50Cu40Al10 alloys

Yoshihiko Yokoyama; Kenzo Fukaura; Akihisa Inoue

doi:10.2320/matertrans.45.1672

Effect of Ni addition on fatigue properties of bulk glassy Zr ₅₀Cu₄₀Al₁₀ alloys

Yoshihiko Yokoyama, Kenzo Fukaura, Akihisa Inoue

Institute for Materials Research (IMR)

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

36 Citations (Scopus)

Abstract

We examined Wöhler curves of Zr₅₀Cu₄₀Al ₁₀ and Zr₅₀Cu₃₀Ni₁₀Al₁₀ bulk glassy alloys (BGAs) using a rotating-beam fatigue test to evaluate the effect of addition Ni on fatigue strength. As a result, we found that the fatigue limit was increased from 250 MPa to 500 MPa by adding 10 at% Ni instead of Cu to a Zr₅₀Cu₄₀Al₁₀ BGA. Zr ₅₀Cu₄₀Al₁₀ BGAs exhibit wider fatigue-fractured region with striation-like marks than that of Zr₅₀Cu ₃₀Ni₁₀Al₁₀ BGAs. Additive Ni element limits the fatigue-fractured region to half of the whole fractured surface. We also measured dimensions of fatigue-fracture area of Zr₅₀Cu ₄₀Al₁₀ and Zr₅₀Cu₃₀Ni ₁₀Al₁₀ BGAs to estimate the value of fatigue-fracture toughness. Especially, the fatigue fracture toughness decreases suddenly around 10⁵-̃10⁴ cycles, similar to the Wöhler curves. The significant decrease of fatigue-fracture toughness originates from embrittlement/hardening in front of the fatigue crack tip during fatigue test.

Original language	English
Pages (from-to)	1672-1678
Number of pages	7
Journal	Materials Transactions
Volume	45
Issue number	5
DOIs	https://doi.org/10.2320/matertrans.45.1672
Publication status	Published - 2004 May

Keywords

Fatigue limit
French's damage curve
Striation-like mark
Surface oxidization
Wöhler curve
ZrCuAl and ZrCu NiAl Bgas

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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abstract = "We examined W{\"o}hler curves of Zr50Cu40Al 10 and Zr50Cu30Ni10Al10 bulk glassy alloys (BGAs) using a rotating-beam fatigue test to evaluate the effect of addition Ni on fatigue strength. As a result, we found that the fatigue limit was increased from 250 MPa to 500 MPa by adding 10 at% Ni instead of Cu to a Zr50Cu40Al10 BGA. Zr 50Cu40Al10 BGAs exhibit wider fatigue-fractured region with striation-like marks than that of Zr50Cu 30Ni10Al10 BGAs. Additive Ni element limits the fatigue-fractured region to half of the whole fractured surface. We also measured dimensions of fatigue-fracture area of Zr50Cu 40Al10 and Zr50Cu30Ni 10Al10 BGAs to estimate the value of fatigue-fracture toughness. Especially, the fatigue fracture toughness decreases suddenly around 105{\~-}104 cycles, similar to the W{\"o}hler curves. The significant decrease of fatigue-fracture toughness originates from embrittlement/hardening in front of the fatigue crack tip during fatigue test.",

keywords = "Fatigue limit, French's damage curve, Striation-like mark, Surface oxidization, W{\"o}hler curve, ZrCuAl and ZrCu NiAl Bgas",

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AU - Yokoyama, Yoshihiko

AU - Fukaura, Kenzo

AU - Inoue, Akihisa

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N2 - We examined Wöhler curves of Zr50Cu40Al 10 and Zr50Cu30Ni10Al10 bulk glassy alloys (BGAs) using a rotating-beam fatigue test to evaluate the effect of addition Ni on fatigue strength. As a result, we found that the fatigue limit was increased from 250 MPa to 500 MPa by adding 10 at% Ni instead of Cu to a Zr50Cu40Al10 BGA. Zr 50Cu40Al10 BGAs exhibit wider fatigue-fractured region with striation-like marks than that of Zr50Cu 30Ni10Al10 BGAs. Additive Ni element limits the fatigue-fractured region to half of the whole fractured surface. We also measured dimensions of fatigue-fracture area of Zr50Cu 40Al10 and Zr50Cu30Ni 10Al10 BGAs to estimate the value of fatigue-fracture toughness. Especially, the fatigue fracture toughness decreases suddenly around 105-̃104 cycles, similar to the Wöhler curves. The significant decrease of fatigue-fracture toughness originates from embrittlement/hardening in front of the fatigue crack tip during fatigue test.

AB - We examined Wöhler curves of Zr50Cu40Al 10 and Zr50Cu30Ni10Al10 bulk glassy alloys (BGAs) using a rotating-beam fatigue test to evaluate the effect of addition Ni on fatigue strength. As a result, we found that the fatigue limit was increased from 250 MPa to 500 MPa by adding 10 at% Ni instead of Cu to a Zr50Cu40Al10 BGA. Zr 50Cu40Al10 BGAs exhibit wider fatigue-fractured region with striation-like marks than that of Zr50Cu 30Ni10Al10 BGAs. Additive Ni element limits the fatigue-fractured region to half of the whole fractured surface. We also measured dimensions of fatigue-fracture area of Zr50Cu 40Al10 and Zr50Cu30Ni 10Al10 BGAs to estimate the value of fatigue-fracture toughness. Especially, the fatigue fracture toughness decreases suddenly around 105-̃104 cycles, similar to the Wöhler curves. The significant decrease of fatigue-fracture toughness originates from embrittlement/hardening in front of the fatigue crack tip during fatigue test.

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KW - Striation-like mark

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KW - Wöhler curve

KW - ZrCuAl and ZrCu NiAl Bgas

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