IMECH-IR  > 非线性力学国家重点实验室
Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation
Chen L(陈柳); Yuan FP(袁福平); Jiang P(姜萍); Xie JJ(谢季佳); Wu XL(武晓雷); Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
2017-05-10
Volume694Pages:98-109
ISSN0921-5093
AbstractThe surface mechanical attrition treatment was taken to fabricate the gradient structure in AZ31 magnesium alloy sheet. Microstructural investigations demonstrate the formation of dual gradients with respect to grain size and orientation where the microstructural sizes decreased from several microns to about 200 nm from center area to treated surface while the c-axis gradually inclined from being vertical to treated plane towards parallel with it. According to tensile results the gradient structured sample has yield strength of 305 MPa in average which is increased by about 4 times when compared with its coarse-grained counterpart. Meanwhile contrary to quickly failure after necking in most traditional magnesium alloys the failure process of gradient structure appears more gently which makes it has 6.5% uniform elongation but 11.5% total elongation. The further comparative tensile tests for separated gradient layers and corresponding cores demonstrate that the gradient structured sample has higher elongation either in uniform or in post-uniform stages. In order to elucidate the relationship between mechanical properties and deformation mechanisms for this dual gradient structure the repeated stress relaxation tests and pole figure examinations via X-ray diffraction were conducted in constituent gradient layer and corresponding core as well as gradient structured sample. The results show that the pyramidal dislocations in dual gradient structure are activated through the whole thickness of sample. Together with the contribution of grain-size gradient more dislocations are activated in dual gradient structure under tensile loading which results in stronger strain hardening and hence higher tensile ductility.
KeywordGradient Structure Mechanical Properties Tensile Ductility Magnesium Alloy
DOI10.1016/j.msea.2017.04.005
Indexed BySCI ; EI
Language英语
WOS IDWOS:000401597300013
WOS KeywordMAGNESIUM AZ31 ALLOY ; NONBASAL SLIP ; ULTRAHIGH-STRENGTH ; PURE MAGNESIUM ; DUCTILITY ; TEMPERATURE ; ANISOTROPY ; AUSTENITE ; SYSTEMS ; COPPER
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China (NSFC)(51301187 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB22040500) ; 973 Programs(2012CB932203 ; 11572328 ; 2012CB937500 ; 11222224 ; 6138504) ; 11472286)
DepartmentLNM实验平台 ; LNM材料介观力学性能的表征
Classification一类
Ranking1
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Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60554
Collection非线性力学国家重点实验室
Corresponding AuthorWu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Chen L,Yuan FP,Jiang P,et al. Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2017,694:98-109.
APA 陈柳,袁福平,姜萍,谢季佳,武晓雷,&Wu, XL .(2017).Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,694,98-109.
MLA 陈柳,et al."Mechanical properties and deformation mechanism of Mg-Al-Zn alloy with gradient microstructure in grain size and orientation".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 694(2017):98-109.
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