Strengthening via deformation twinning in a nickel alloy

Shaw, Leon L.; Villegas, Juan; Huang, Jian-Yu; Chen, Shuo

doi:10.1016/j.msea.2007.06.072

Strengthening via deformation twinning in a nickel alloy

Journal Article · Sun Jul 01 00:00:00 EDT 2007 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2007.06.072· OSTI ID:1426945

Shaw, Leon L. ^[1]; Villegas, Juan ^[1]; Huang, Jian-Yu ^[2]; Chen, Shuo ^[3]

Univ. of Connecticut, Storrs, CT (United States). Department of Chemical, Materials and Biomolecular Engineering
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnology (CINT)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Electrochemical Energy Laboratory

In this study, nanograins and nanotwins are produced in specimens using one processing technique to allow direct comparison in their nanohardnesses. It is shown that the hardness of nanotwins can be close to the lower end of the hardness of nanograins. The resistance of nanotwins to dislocation movement is explained based on elastic interactions between the incident 60° dislocation and the product dislocations. The latter includes one Shockley partial at the twin boundary and one 60° dislocation in the twinned region. The analysis indicates that a resolved shear stress of at least 1.24 GPa is required for a 60° dislocation to pass across a twin boundary in the nickel alloy investigated. It is this high level of the required shear stress coupled with a limited number of dislocations that can be present between two adjacent twin boundaries that provides nanotwins with high resistance to dislocation movement. The model proposed is corroborated by the detailed analysis of high-resolution transmission electron microscopy.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1426945

Alternate ID(s):: OSTI ID: 21146163

Report Number(s):: SAND--2007-1949J; 526865

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: 1-2 Vol. 480; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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A Novel Strategy for the Design of Advanced Engineering Alloys-Strengthening Turbine Disk Superalloys via Twinning Structures Yuan, Yong; Gu, Yuefeng; Cui, Chuanyong Advanced Engineering Materials, Vol. 13, Issue 4 https://doi.org/10.1002/adem.201000232	journal	December 2010
Characterization of Plastic Deformation Induced by Shot-Peening in a Ni-Base Superalloy Messé, O. M. D. M.; Stekovic, S.; Hardy, M. C. JOM, Vol. 66, Issue 12 https://doi.org/10.1007/s11837-014-1184-8	journal	October 2014
Formation mechanism of fivefold deformation twins in a face-centered cubic alloy Zhang, Zhenyu; Huang, Siling; Chen, Leilei Scientific Reports, Vol. 7, Issue 1 https://doi.org/10.1038/srep45405	journal	March 2017

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36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
Nanomaterials
Nickel alloys
Strengthening
Twins

Strengthening via deformation twinning in a nickel alloy

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