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      Effect of Surface Mechanical Treatments on the Microstructure-Property-Performance of Engineering Alloys

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          Abstract

          Fatigue is a dominant failure mechanism of several engineering components. One technique for increasing the fatigue life is by inducing surface residual stress to inhibit crack initiation. In this review, a microstructural study under various bulk (such as severe plastic deformation) and surface mechanical treatments is detailed. The effect of individual microstructural feature, residual stress, and strain hardening on mechanical properties and fatigue crack mechanisms are discussed in detail with a focus on nickel-based superalloys. Attention is given to the gradient microstructure and interface boundary behavior for the mechanical performance. It is recommended that hybrid processes, such as shot peening (SP) followed by deep cold rolling (DCR), could enhance fatigue life. The technical and scientific understanding of microstructural features delineated here could be useful for developing materials for fatigue performance.

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              Imperfect Oriented Attachment: Dislocation Generation in Defect-Free Nanocrystals

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                07 August 2019
                August 2019
                : 12
                : 16
                Affiliations
                [1 ]School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
                [2 ]Advanced Remanufacturing and Technology Centre, Agency for Science, Technology and Research (A*STAR), 3 CleanTech Loop, Singapore 637143, Singapore
                [3 ]Energy Research Institute, Nanyang Technological University, Singapore 639798, Singapore
                Author notes
                [* ]Correspondence: msridhar@ 123456ntu.edu.sg
                Article
                materials-12-02503
                10.3390/ma12162503
                6720836
                31394741
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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