Effects of pre-strain on shock compression and spallation damage of titanium

被引：2
作者：
Lin, Z. H. [1 ,2 ]
Cai, Y. [3 ,4 ]
Bian, Y. L. [3 ]
Xu, J. [3 ]
Li, L. X. [3 ]
Zhang, N. B. [1 ,2 ]
Liu, J. H. [5 ]
Lu, L. [1 ,2 ]
Luo, S. N. [1 ,2 ]
机构：
[1] Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu, Sichuan, Peoples R China
[2] Southwest Jiaotong Univ, Dynam Mat Data Sci Ctr, Chengdu, Sichuan, Peoples R China
[3] Peac Inst Multiscale Sci, Chengdu, Sichuan, Peoples R China
[4] Key Lab Extreme Mat Dynam Technol, Chengdu, Sichuan, Peoples R China
[5] Chengdu JiangDe Technol Co Ltd, Chengdu, Sichuan, Peoples R China
来源：
MATERIALIA | 2024年 / 36卷
关键词：
Deformation twins; Titanium; Spall damage; Microstructure; PURE TITANIUM; DEFORMATION-BEHAVIOR; DUCTILE FRACTURE; ALPHA-TITANIUM; TI; EVOLUTION; MECHANISMS; NUCLEATION; STRENGTH; ALLOY;
D O I：
10.1016/j.mtla.2024.102181
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of pre-strain on shock compression and spallation damage of commercially pure titanium are investigated via plate impact experiments. The titanium samples are pre-compressed along the rolling direction to different strains (up to 9% strain) and then impacted along the normal direction. Free-surface velocity histories are obtained via laser Doppler velocimetry. Scanning electron microscopy and electron backscatter diffraction characterizations are conducted on the postmortem samples. The Hugoniot equation of state of the titanium with zero pre-strain is determined up to 14 GPa. {1012}(1120) ( 1120 ) extension twins and {1122}(1010) ( 1010 ) contraction twins are generated during the pre-strain process. Shock loading leads to increased number density of {1012}(1120) ( 1120 ) and {1122}(1010) ( 1010 ) twins, and the generation of {1121}(1010) ( 1010 ) extension twins. Pre-strain results in smeared elastic-plastic transition under shock compression. In addition, impact loading induces numerous secondary twins for the sample with the maximum pre-compressive strain (9%). Spallation occurs via ductile damage regardless of the level of pre-strain. Voids prefer to nucleate at grain boundaries rather than at twin boundaries or in grain interiors. Pre-strain results in a negligible increase in spall strength.
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页数：10
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