Size-dependent to size-independent transition in creep of single crystalline Cu micropillars

被引：2

作者：

Liu, Ying ^{[1
,2
,3
]}

Liu, Wenbin ^{[1
,2
,3
]}

Yu, Long ^{[1
]}

Sui, Haonan ^{[1
,2
,3
]}

Cheng, Yangyang ^{[1
]}

Duan, Huiling ^{[1
,2
,3
]}

机构：

[1] Peking Univ, State Key Lab Turbulence & Complex Syst, Dept Mech & Engn Sci, BIC ESAT,Coll Engn, Beijing 100871, Peoples R China

[2] Peking Univ, HEDPS, CAPT, Beijing 100871, Peoples R China

[3] Peking Univ, IFSA Collaborat Innovat Ctr MoE, Beijing 100871, Peoples R China

来源：

EXTREME MECHANICS LETTERS | 2022年 / 56卷

基金：

中国国家自然科学基金;

关键词：

Micromechanical test; Creep; Transition behavior; Competition mechanism; BCC METALS; DISLOCATION; PLASTICITY; NICKEL; DEFORMATION; MODEL; FLOW; MECHANISMS; STRENGTH; PILLARS;

D O I：

10.1016/j.eml.2022.101843

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Micromechanical tests are performed to investigate the sample size effects on creep behavior of single crystalline Cu micropillars at room temperature. We report a transition from size-dependent to size -independent creep, where the transition size decreases with increasing holding stress. Furthermore, we find that the stress-related transition from size-dependent to size-independent creep can be explained by the competition between thermally-activated dislocation generation from sources and thermally -activated dislocation motion. Based on this competition mechanism, a quantitative model is established to further formulate the transition, where the model predictions agree well with the experimental results. (C) 2022 Elsevier Ltd. All rights reserved.

引用

页数：8

共 52 条

[1] Size-dependent fracture toughness of tungsten [J].

Ast, Johannes ;

Goeken, Mathias ;

Durst, Karsten .

ACTA MATERIALIA, 2017, 138 :198-211

[2] Effects of pre-strain on the compressive stress-strain response of Mo-alloy single-crystal micropillars [J].

Bei, H. ;

Shim, S. ;

Pharr, G. M. ;

George, E. P. .

ACTA MATERIALIA, 2008, 56 (17) :4762-4770

[3] Fundamental differences in mechanical behavior between two types of crystals at the nanoscale [J].

Brinckmann, Steffen ;

Kim, Ju-Young ;

Greer, Julia R. .

PHYSICAL REVIEW LETTERS, 2008, 100 (15)

[4] Failure of fracture toughness criterion at small scales [J].

Cheng, Yangyang ;

Yu, Long ;

Chen, Lirong ;

Liu, Wenbin ;

Yi, Xin ;

Duan, Hulling .

PHYSICAL REVIEW MATERIALS, 2019, 3 (11)

[5] Nanoscale room temperature creep of nanocrystalline nickel pillars at low stresses [J].

Choi, In-Chul ;

Kim, Yong-Jae ;

Seok, Moo-Young ;

Yoo, Byung-Gil ;

Kim, Ju-Young ;

Wang, Yinmin ;

Jang, Jae-il .

INTERNATIONAL JOURNAL OF PLASTICITY, 2013, 41 :53-64

[6] A MODEL FOR BOUNDARY DIFFUSION CONTROLLED CREEP IN POLYCRYSTALLINE MATERIALS [J].

COBLE, RL .

JOURNAL OF APPLIED PHYSICS, 1963, 34 (06) :1679-&

[7] Theoretical and numerical investigations of single arm dislocation source controlled plastic flow in FCC micropillars [J].

Cui, Y. N. ;

Lin, P. ;

Liu, Z. L. ;

Zhuang, Z. .

INTERNATIONAL JOURNAL OF PLASTICITY, 2014, 55 :279-292

[8] Scale-free intermittent flow in crystal plasticity [J].

Dimiduk, Dennis M. ;

Woodward, Chris ;

LeSar, Richard ;

Uchic, Michael D. .

SCIENCE, 2006, 312 (5777) :1188-1190

[9] Unravelling the physics of size-dependent dislocation-mediated plasticity [J].

El-Awady, Jaafar A. .

NATURE COMMUNICATIONS, 2015, 6

[10] The role of the weakest-link mechanism in controlling the plasticity of micropillars [J].

El-Awady, Jaafar A. ;

Wen, Ming ;

Ghoniem, Nasf M. .

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2009, 57 (01) :32-50

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