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

被引：1
|
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.
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页数：8
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