Emergence of crack tip plasticity in semi-brittle α-Fe

被引：0

作者：

Suzudo, T. ^{[1
]}

Ebihara, K. ^{[1
]}

Tsuru, T. ^{[2
,3
,4
]}

Mori, H. ^{[5
]}

机构：

[1] Japan Atom Energy Agcy, Ctr Computat Sci & Esyst, Ibaraki 3191195, Japan

[2] Japan Atom Energy Agcy, Nucl Sci & Engn Ctr, Ibaraki 3191195, Japan

[3] Kyoto Univ, Elements Strategy Initiat Struct Mat ESISM, Honmachi,Sakyo Ku, Kyoto 6068501, Japan

[4] Japan Sci & Technol Agcy, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 3320012, Japan

[5] Coll Ind Technol, Dept Mech Engn, Amagasaki, Hyogo 6610047, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2024年 / 135卷 / 07期

基金：

日本学术振兴会;

关键词：

BRITTLE; FRACTURE;

D O I：

10.1063/5.0178940

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Fractures in body-centered-cubic metals and alloys below the ductile-to-brittle transition temperature are brittle. This is theoretically explained by the notion that the critical stress intensity factor of a given crack front for brittle fracture is smaller than that for plastic deformation; hence, brittle fracture is selected over plastic deformation. Although this view is true from a macroscopic perspective, such a fracture is always accompanied by small-scale plastic deformation near the crack tip, that is, crack tip plasticity. This paper investigates the origin of this plasticity using atomistic modeling with the machine learning interatomic potential of alpha-Fe. Some plastic modes are activated by rapid crack propagation, whereas no plasticity is activated when the crack tips are gradually fractured. The group of activated atoms dynamically caused by brittle crack propagation was identified as the precursor of plasticity.

引用

页数：7

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