Fracture mechanism of electrically-assisted micro-tension in nanostructured titanium using synchrotron radiation X-ray tomography

被引：9
作者：
Chen, Wanji [1 ,2 ,3 ]
Xu, Jie [1 ,2 ,3 ]
Ding, Chaogang [1 ,2 ,3 ]
Shan, Debin [1 ,2 ,3 ]
Guo, Bin [1 ,2 ,3 ]
Langdon, Terence G. [4 ]
机构：
[1] Harbin Inst Technol, State Key Lab Precis Hot Proc, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[3] Harbin Inst Technol, Minist Educ, Key Lab Microsyst & Microstruct Mfg, Harbin 150080, Peoples R China
[4] Univ Southampton, Dept Mech Engn, Mat Res Grp, Southampton SO17 1BJ, England
来源：
SCRIPTA MATERIALIA | 2023年 / 222卷
基金：
欧洲研究理事会; 中国国家自然科学基金;
关键词：
Fracture; Electrically-assisted micro-tension; Micro-forming; Nano-Ti; Synchrotron X-ray tomography; HIGH-PRESSURE TORSION; BEHAVIOR; AZ31;
D O I：
10.1016/j.scriptamat.2022.114997
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A coarse-grained (CG) Ti with an average grain size of similar to 50 mu m was processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa through 10 turns at room temperature (RT) to produce nanostructured titanium (Nano-Ti) with an average grain size of similar to 95 nm. Electrically-assisted (EA) micro-tensions of CG-Ti and Nano-Ti were performed using pulsed unidirectional current with a current density of 750 A/mm(2), pulse width of 10(-4) s. The stress drop is higher for Nano-Ti compared with CG-Ti. The results of fractograph observations show many cleavage steps in Nano-Ti while the CG-Ti is dominated by dimples. The spatial distribution of voids in tensile specimens was revealed after testing using synchrotron radiation X-ray tomography. The results demonstrate that applying a pulse current can effectively reduce the number and volume of voids before fracture. A model is presented describing the fracture mechanism of CG-Ti and Nano-Ti during EA micro-tension.
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页数：5
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