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Combined strengthening from nanotwins and nanoprecipitates in an iron-based superalloy
Zhang, BB; Yan, FK; Zhao, MJ; Tao, NR; Lu, K; Tao, NR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2018-06-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume151Pages:310-320
AbstractA bulk nanostructured solutionized iron-based superalloy consisting of nanotwins and dislocation structures was prepared by means of dynamic plastic deformation at a high strain rate. The nanotwins constitute similar to 51% in volume with the average twin/matrix lamella thickness of similar to 20 nm. The sample exhibits a yield strength as high as 1130 MPa but with nearly zero uniform elongation. Subsequent peak-aging treatment at 700 degrees C for 1 h results in the precipitation of nano-sized gamma prime phases with a random distribution in the nanotwins and deformed matrix. The nanotwins still remain and keep the corresponding strengthening after aging. Those dispersed nanoprecipitates further raise the strength of the aged sample to 1420 MPa. Meanwhile, the uniform elongation increases to similar to 3% due to the intrinsic plasticity of nanotwins with a reduced dislocation density after aging annealing. This kind of combined strengthening from both nanotwins and precipitates provides a new strategy to further raise the strength of nanotwinned materials or precipitation-strengthened materials. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; A bulk nanostructured solutionized iron-based superalloy consisting of nanotwins and dislocation structures was prepared by means of dynamic plastic deformation at a high strain rate. The nanotwins constitute similar to 51% in volume with the average twin/matrix lamella thickness of similar to 20 nm. The sample exhibits a yield strength as high as 1130 MPa but with nearly zero uniform elongation. Subsequent peak-aging treatment at 700 degrees C for 1 h results in the precipitation of nano-sized gamma prime phases with a random distribution in the nanotwins and deformed matrix. The nanotwins still remain and keep the corresponding strengthening after aging. Those dispersed nanoprecipitates further raise the strength of the aged sample to 1420 MPa. Meanwhile, the uniform elongation increases to similar to 3% due to the intrinsic plasticity of nanotwins with a reduced dislocation density after aging annealing. This kind of combined strengthening from both nanotwins and precipitates provides a new strategy to further raise the strength of nanotwinned materials or precipitation-strengthened materials. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[zhang, b. b. ; yan, f. k. ; zhao, m. j. ; tao, n. r. ; lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [zhang, b. b.] univ chinese acad sci, beijing 100049, peoples r china
KeywordHigh Electrical-conductivity Dynamic Plastic-deformation Austenitic Stainless-steel Low-carbon Steels Cu-al Alloy Cr-zr Alloy Microstructural Evolution Tensile Behavior Pure Nickel Ag Alloy
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Natural Science Foundation of China [51771196, 51501191, U1730140]; National Key R&D Program of China [2017YFA0204401, 2017YFA0204402]; Key Research Program of Frontier Science, Chinese Academy of Sciences
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79290
Collection中国科学院金属研究所
Corresponding AuthorTao, NR (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, BB,Yan, FK,Zhao, MJ,et al. Combined strengthening from nanotwins and nanoprecipitates in an iron-based superalloy[J]. ACTA MATERIALIA,2018,151:310-320.
APA Zhang, BB,Yan, FK,Zhao, MJ,Tao, NR,Lu, K,&Tao, NR .(2018).Combined strengthening from nanotwins and nanoprecipitates in an iron-based superalloy.ACTA MATERIALIA,151,310-320.
MLA Zhang, BB,et al."Combined strengthening from nanotwins and nanoprecipitates in an iron-based superalloy".ACTA MATERIALIA 151(2018):310-320.
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