Localized dislocation interactions within slip bands and crack initiation in Mg-10Gd-3Y-0.3Zr alloy

被引：26

作者：

He, Chao ^{[1
,2
]}

Li, Xue ^{[1
]}

Liu, Yongjie ^{[1
,2
]}

Wang, Chong ^{[1
,2
]}

Zhang, Hong ^{[1
,2
]}

Li, Lang ^{[1
,2
]}

Wang, Qingyuan ^{[1
,3
]}

Shao, Xiaohong ^{[4
]}

Chen, Qiang ^{[5
]}

机构：

[1] Sichuan Univ, Coll Architecture & Environm, Key Lab Deep Earth Sci & Engn, Minist Educ, Chengdu 610065, Peoples R China

[2] Sichuan Univ, Key Lab Sichuan Prov, Failure Mech & Engn Disaster Prevent & Mitigat, Chengdu 610065, Peoples R China

[3] Chengdu Univ, Sch Architecture & Civil Engn, Chengdu 610106, Peoples R China

[4] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[5] Kyushu Univ, Fac Engn, Fatigue & Fracture Mat Lab, Fukuoka 8190395, Japan

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2021年 / 150卷

基金：

中国国家自然科学基金;

关键词：

Fatigue crack initiation; Slip bands; Magnesium alloy; Dislocation intensity zone; (c plus a) dislocation; HIGH-CYCLE FATIGUE; MAGNESIUM ALLOYS; C PLUS; POLYCRYSTALLINE MAGNESIUM; EARLY PROPAGATION; DEFORMATION; BEHAVIOR; TENSILE;

D O I：

10.1016/j.ijfatigue.2021.106302

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The underlying low-stress cyclic deformation and associated dislocation activities within the slip bands (SBs) in a rare earth-containing magnesium (RE-Mg) alloy were characterized. The results show that basal slip is the predominant deformation at grain scale, but the gliding of (c + a) dislocation is also visible near grain boundaries to accommodate localized inhomogeneous deformation. The interaction between basal (a) dislocations and nonbasal (c + a) dislocations results in the nucleation of dislocation intensity zones (DIZs), which subsequently hinders the development of the basal slip bands. Therefore, it is suggested that the DIZs contributed to the enhanced high cycle fatigue resistance of RE-Mg alloys.

引用

页数：10

共 38 条

[1] Pyramidal II to basal transformation of 'c plus a' edge dislocations in Mg-Y alloys [J].

Ahmad, Rasool ;

Wu, Zhaoxuan ;

Groh, Sebastien ;

Curtin, W. A. .

SCRIPTA MATERIALIA, 2018, 155 :114-118

[2] The role of microtexture on the faceted fracture morphology in Ti-6Al-4V subjected to high-cycle fatigue [J].

Bantounas, Ioannis ;

Dye, David ;

Lindley, Trevor C. .

ACTA MATERIALIA, 2010, 58 (11) :3908-3918

[3] Cracks and extrusions caused by persistent slip bands [J].

Brown, L. M. .

PHILOSOPHICAL MAGAZINE, 2013, 93 (28-30) :3809-3820

[4] Structural evolutions of metallic materials processed by severe plastic deformation [J].

Cao, Yang ;

Ni, Song ;

Liao, Xiaozhou ;

Song, Min ;

Zhu, Yuntian .

MATERIALS SCIENCE & ENGINEERING R-REPORTS, 2018, 133 :1-59

[5] Effects of microstructural inhomogeneities and micro-defects on tensile and very high cycle fatigue behaviors of the friction stir welded ZK60 magnesium alloy joint [J].

Chen, Yao ;

He, Chao ;

Yang, Kun ;

Zhang, Hong ;

Wang, Chong ;

Wang, Qingyuan ;

Liu, Yongjie .

INTERNATIONAL JOURNAL OF FATIGUE, 2019, 122 :218-227

[6] Characteristic cyclic plastic deformation in ZK60 magnesium alloy [J].

Dong, Shuai ;

Yu, Qin ;

Jiang, Yanyao ;

Dong, Jie ;

Wang, Fenghua ;

Jin, Li ;

Ding, Wenjiang .

INTERNATIONAL JOURNAL OF PLASTICITY, 2017, 91 :25-47

[7] ANNIHILATION OF DISLOCATIONS DURING TENSILE AND CYCLIC DEFORMATION AND LIMITS OF DISLOCATION DENSITIES [J].

ESSMANN, U ;

MUGHRABI, H .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1979, 40 (06) :731-756

[8] The role of twinning deformation on the hardening response of polycrystalline magnesium from discrete dislocation dynamics simulations [J].

Fan, Haidong ;

Aubry, Sylvie ;

Arsenlis, Athanasios ;

El-Awady, Jaafar A. .

ACTA MATERIALIA, 2015, 92 :126-139

[9]

Hansen Niels., 2014, Physical Metallurgy, P1681, DOI DOI 10.1016/B978-0-444-53770-6.00017-4

[10] Small crack initiation and early propagation in an as-extruded Mg-10Gd-3Y-0.5Zr alloy in high cycle fatigue regime [J].

He, Chao ;

Shao, Xiaohong ;

Yuan, Shucheng ;

Peng, Liming ;

Wu, Yujuan ;

Wang, Qingyuan ;

Chen, Qiang .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2019, 744 :716-723

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