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Influence of processing temperature on microstructure and microhardness of copper subjected to high-pressure torsion
Xie ZL(谢子令); Xie JJ(谢季佳); Hong YS(洪友士); Wu XL(武晓雷); Xie ZL
Source PublicationScience China-Technological Sciences
2010
Volume53Issue:6Pages:1534-1539
ISSN1674-7321
AbstractCu samples were subjected to high-pressure torsion (HPT) with up to 6 turns at room temperature (RT) and liquid nitrogen temperature (LNT), respectively. The effects of temperature on grain refinement and microhardness variation were investigated. For the samples after HPT processing at RT, the grain size reduced from 43 mu m to 265 nm, and the Vickers microhardness increased from HV52 to HV140. However, for the samples after HPT processing at LNT, the value of microhardness reached its maximum of HV150 near the center of the sample and it decreased to HV80 at the periphery region. Microstructure observations revealed that HPT straining at LNT induced lamellar structures with thickness less than 100 nm appearing near the central region of the sample, but further deformation induced an inhomogeneous distribution of grain sizes, with submicrometer-sized grains embedded inside micrometer-sized grains. The submicrometer-sized grains with high dislocation density indicated their nonequilibrium nature. On the contrary, the micrometer-sized grains were nearly free of dislocation, without obvious deformation trace remaining in them. These images demonstrated that the appearance of micrometer-sized grains is the result of abnormal grain growth of the deformed fine grains.
DOI10.1007/s11431-010-3157-7
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Indexed BySCI
Language英语
WOS IDWOS:000278839200014
WOS KeywordNANOCRYSTALLINE ; DEFORMATION ; CU ; EVOLUTION ; METALS ; ALLOY
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Multidisciplinary ; Materials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China [10721202, 10772178, 50571110]
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/43497
Collection非线性力学国家重点实验室
Corresponding AuthorXie ZL
Recommended Citation
GB/T 7714
Xie ZL,Xie JJ,Hong YS,et al. Influence of processing temperature on microstructure and microhardness of copper subjected to high-pressure torsion[J]. Science China-Technological Sciences,2010,53(6):1534-1539
APA 谢子令,谢季佳,洪友士,武晓雷,&Xie ZL.(2010).Influence of processing temperature on microstructure and microhardness of copper subjected to high-pressure torsion.Science China-Technological Sciences,53(6),1534-1539.
MLA 谢子令,et al."Influence of processing temperature on microstructure and microhardness of copper subjected to high-pressure torsion".Science China-Technological Sciences 53.6(2010):1534-1539.
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