Behavior of cracking in Mo3Al-Mo3Al8 two-phase intermetallics with lamellar structures

Rikiya Nino; Seiji Miura; Tetsuo Mohri

doi:10.1016/S0966-9795(00)00106-0

Behavior of cracking in Mo₃Al-Mo₃Al₈ two-phase intermetallics with lamellar structures

Rikiya Nino, Seiji Miura, Tetsuo Mohri

Institute for Materials Research (IMR)

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

20 Citations (Scopus)

Abstract

The behavior of cracking in Mo-Al intermetallics with two different interlamellar spacings is investigated by micro Vickers tests at room temperature. The experimental results show the coarse lamellar structure can suppress crack nucleation even under a high load of 9.8 N, whereas the fine one starts being cracked under a low load of 2.94 N. It contradicts to the general observation that toughness of alloys is better with finer grains. The experimental observations are discussed in terms of a fracture mechanics model including dislocation emission at the crack tip. The present model shows that stress concentration at crack tip tends to increase with decreasing interlamellar spacing. The experimental results are qualitatively explained by the present model.

Original language	English
Pages (from-to)	113-118
Number of pages	6
Journal	Intermetallics
Volume	9
Issue number	2
DOIs	https://doi.org/10.1016/S0966-9795(00)00106-0
Publication status	Published - 2001 Feb

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/S0966-9795(00)00106-0

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title = "Behavior of cracking in Mo3Al-Mo3Al8 two-phase intermetallics with lamellar structures",

abstract = "The behavior of cracking in Mo-Al intermetallics with two different interlamellar spacings is investigated by micro Vickers tests at room temperature. The experimental results show the coarse lamellar structure can suppress crack nucleation even under a high load of 9.8 N, whereas the fine one starts being cracked under a low load of 2.94 N. It contradicts to the general observation that toughness of alloys is better with finer grains. The experimental observations are discussed in terms of a fracture mechanics model including dislocation emission at the crack tip. The present model shows that stress concentration at crack tip tends to increase with decreasing interlamellar spacing. The experimental results are qualitatively explained by the present model.",

author = "Rikiya Nino and Seiji Miura and Tetsuo Mohri",

note = "Funding Information: This research was partially supported by NEDO (New Energy and Industrial Technology Development Organization) under contract 98Ec07-004-2 with Hokkaido University. ",

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T1 - Behavior of cracking in Mo3Al-Mo3Al8 two-phase intermetallics with lamellar structures

AU - Nino, Rikiya

AU - Miura, Seiji

AU - Mohri, Tetsuo

N1 - Funding Information: This research was partially supported by NEDO (New Energy and Industrial Technology Development Organization) under contract 98Ec07-004-2 with Hokkaido University.

PY - 2001/2

Y1 - 2001/2

N2 - The behavior of cracking in Mo-Al intermetallics with two different interlamellar spacings is investigated by micro Vickers tests at room temperature. The experimental results show the coarse lamellar structure can suppress crack nucleation even under a high load of 9.8 N, whereas the fine one starts being cracked under a low load of 2.94 N. It contradicts to the general observation that toughness of alloys is better with finer grains. The experimental observations are discussed in terms of a fracture mechanics model including dislocation emission at the crack tip. The present model shows that stress concentration at crack tip tends to increase with decreasing interlamellar spacing. The experimental results are qualitatively explained by the present model.

AB - The behavior of cracking in Mo-Al intermetallics with two different interlamellar spacings is investigated by micro Vickers tests at room temperature. The experimental results show the coarse lamellar structure can suppress crack nucleation even under a high load of 9.8 N, whereas the fine one starts being cracked under a low load of 2.94 N. It contradicts to the general observation that toughness of alloys is better with finer grains. The experimental observations are discussed in terms of a fracture mechanics model including dislocation emission at the crack tip. The present model shows that stress concentration at crack tip tends to increase with decreasing interlamellar spacing. The experimental results are qualitatively explained by the present model.

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Behavior of cracking in Mo₃Al-Mo₃Al₈ two-phase intermetallics with lamellar structures

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