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Effect of lattice misfit on the evolution of the dislocation structure in Ni-based single crystal superalloys during thermal exposure
Long, HB; Wei, H; Liu, YN; Mao, SC; Zhang, JX; Xiang, SS; Chen, YH; Gui, WM; Li, Q; Zhang, Z; Han, XD; Han, XD (reprint author), Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China.; Liu, YN (reprint author), Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia.
2016-11-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume120Pages:95-107
AbstractIn this study, we investigate the movement of dislocations in Ni-based superalloys under the influence of lattice misfit stresses between the ordered gamma'-cuboids and the disordered gamma-matrix during thermal exposure in the absence of an applied load. This study focuses on a different condition than the conventional creep testing, and thus offers a unique opportunity to study the intrinsic behavior of the alloy. The dislocation density increases substantially with time during thermal exposure, leading to the formation of various configurations of dislocation networks on the {100}(gamma/gamma') interfaces, including <110> diamond-shaped, <110>/<100> mixed polygon-shaped and <100> square-shaped networks. During thermal exposure, the b = l/2<110> native dislocations first move and evolve into 60 mixed dislocations along the <110> directions on the {100}(gamma/gamma') interfaces, forming the <110> diamond-shaped dislocation networks. In the case of longer thermal exposures, the dislocations further evolve into pure edge dislocations along the <100> on the {100}(gamma/gamma') interface, leading to the evolution of the <110> diamond shaped dislocation networks into <100> square-shaped networks, with the mixed <1104<100> dislocation networks as an intermediate stage during the transition. These movements occur by sweep glide in the {111} planes and diagonal climb on the {100} planes for the edge and mixed dislocations and by cross-slip for the screw dislocations. The driving force for all of these movements is the interaction between the normal misfit stresses and the edge components of the Burgers vectors of the dislocations to relax the misfit stresses. An analysis based on the elastic strain energy considerations is presented to explain the driving forces for the dislocation movements. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[long, haibo ; mao, shengcheng ; xiang, sisi ; chen, yanhui ; li, qing ; zhang, ze ; han, xiaodong] beijing univ technol, inst microstruct & property adv mat, beijing key lab microstruct & property adv mat, beijing 100124, peoples r china ; [wei, hua] nanjing tech univ, coll mat sci & engn, nanjing 211800, jiangsu, peoples r china ; [liu, yinong] univ western australia, sch mech & chem engn, crawley, wa 6009, australia ; [zhang, jianxin] shandong univ, key lab liquid struct & hered mat, minist educ, jinan 250061, peoples r china ; [gui, weimin] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china ; [zhang, ze] zhejiang univ, state key lab silicon mat, hangzhou 310058, zhejiang, peoples r china ; [zhang, ze] zhejiang univ, dept mat sci & engn, hangzhou 310058, zhejiang, peoples r china
KeywordNi-based Superalloys Dislocations Aging Lattice Mismatch Transmission Electron Microscopy
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNSFC [51231008, 51371173, 51471008, 11327901]; Beijing Municipal Education Commission research project [KM201410005033]; Beijing Nova Program [xx2014B108]; Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality [IDHT20140504]; Beijing University of Technology in young teacher ability of internationalization development plans; Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions [TCD201504013]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/76203
Collection中国科学院金属研究所
Corresponding AuthorMao, SC; Han, XD (reprint author), Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China.; Liu, YN (reprint author), Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia.
Recommended Citation
GB/T 7714
Long, HB,Wei, H,Liu, YN,et al. Effect of lattice misfit on the evolution of the dislocation structure in Ni-based single crystal superalloys during thermal exposure[J]. ACTA MATERIALIA,2016,120:95-107.
APA Long, HB.,Wei, H.,Liu, YN.,Mao, SC.,Zhang, JX.,...&Liu, YN .(2016).Effect of lattice misfit on the evolution of the dislocation structure in Ni-based single crystal superalloys during thermal exposure.ACTA MATERIALIA,120,95-107.
MLA Long, HB,et al."Effect of lattice misfit on the evolution of the dislocation structure in Ni-based single crystal superalloys during thermal exposure".ACTA MATERIALIA 120(2016):95-107.
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