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March JOM Examines Mechanical Properties|
Posted on: 2/18/2013 12:00:00 AM... The March 2013 issue of JOM focuses on Mechanical Properties as its theme, examined through ten papers comprising two technical topics: Interphase Defects, Structures, and Phase Stability; and Modeling Mechanical Behavior of Ultrafine-grained Polycrystals.INTERPHASE DEFECTS, STRUCTURES, AND PHASE STABILITY
“Interphase Defects, Structures, and Phase Stability” (Pages 35¬¬8–359)
Also highlighting this edition of JOM is a special feature on the story behind Essential Readings in Light Metals, a comprehensive historical retrospective of the aluminum industry due to be released at the TMS 2013 Annual Meeting and Exhibition in San Antonio, Texas. Other features include an update on the expansion of TMS’s young professionals program, and perspectives on what the future holds for TMS from its newest Board members.
The entire March 2013 issue of JOM is now available online. An overview of the technical topics and articles is presented below. As TMS’s publishing partner, Springer, continues to transition to a new online format, TMS members will need to log in with their society username and password on the TMS website and then visit JOMGateway.net to gain free access to this issue of JOM, as well as articles archived back to 1985.
This commentary summarizes the five articles within this technical topic that examine recent research efforts in understanding
interphase defects, structures, and phase stabilities from different perspectives.
“The Influence of Grain Boundaries on Radiation-Induced Point Defect Production in Materials: A Review of Atomistic Studies” (Pages 360–373)
Xian Ming Bai and Blas P. Uberuaga
Nanocrystalline materials, which contain a high density of grain boundaries, have demonstrated enhanced radiation tolerance compared to large grain counterpart under certain conditions. This is because, as has long been recognized, grain boundaries can serve as defect sinks for absorbing and annihilating radiation-induced defects. Increasingly, researchers have examined how grain boundaries influence the direct production of defects during collision cascade, the origin of the radiation-induced defects. In this review article, the authors analyze the computational studies in this area that have been performed during the past two decades.
“Behavior of Vacancies and Interstitials at Semicoherent Interfaces” (Pages 374–381)
Kedarnath Kolluri, Michael J. Demkowicz, Richard G. Hoagland, and Xiang-Yang Liu
Using atomistic simulations on a model semicoherent interface, the authors show that the formation, migration, and clustering of vacancies and interstitials at semicoherent interfaces depend on the structure of the misfit dislocation network of the interface.
“Atomic Mixing in Metals Under Shear Deformation” (Pages 382–389)
Nhon Q. Vo, Jian Zhou, Yinon Ashkenazy, Daniel Schwen, Robert S. Averback, and Pascal Bellon
This paper discusses fundamental processes of shear-induced chemical mixing in heterogeneous Cu-based alloy systems that have been studied by molecular dynamics computer simulations.
“Atomic-Scale Interfacial Structure in Rock Salt and Tetradymite Chalcogenide Thermoelectric Materials” (Pages 390–400)
D.L. Medlin and G.J. Snyder
Interfaces play important roles in the performance of nanostructured thermoelectric materials. However, understanding of the atomic scale structure of these interfaces is only beginning to emerge. In this overview article, the authors highlight and review several examples illustrating aspects of interfacial structure in the rock salt and tetradymite classes of chalcogenide materials.
“Twinning in Strained Ferroelastics: Microstructure and Statistics” (Pages 401–407)
X. Ding, T. Lookman, E.K.H. Salje, and A. Saxena
The generation of functional interfaces such as superconducting and ferroelectric twin boundaries requires new ways to nucleate as many interfaces as possible in bulk materials and thin films. In this review, the authors show that the nucleation and propagation of twin boundaries depend sensitively on temperature and system size.
MODELING MECHANICAL BEHAVIOR OF ULTRAFINE-GRAINED POLYCRYSTALS
“Influence of Modeling Interfaces on Mechanical Behavior of Polycrystalline Materials” (Pages 408–409)
This commentary introduces the technical topic and summarizes the five papers that comprise it.
“Nanoscale Plasticity at Grain Boundaries in Face-centered Cubic Copper Under Shock Loading” (Pages 410–418)
S.J. Fensin, C. Brandl, E.K. Cerreta, G.T. Gray, T.C. Germann, and S.M. Valone
The authors investigate the responses of four representative grain boundaries in face-centered cubic Cu bicrystals to shock compression as a function of the loading direction. Two loading directions are considered, either parallel or perpendicular to the grain boundary plane, representing the extremes that a polycrystalline sample will ordinarily experience under the uniaxial strain conditions of planar shock loading.
“Introducing Grain Boundary Influenced Stochastic Effects into Constitutive Models” (Pages 419–430)
Stephen R. Niezgoda, Irene J. Beyerlein, Anand K. Kanjarla, and Carlos N. Tomé
Twinning is an important deformation mechanism in hexagonal close-packed (hcp) metals such as Mg, Zr, Ti, and Be. In this article, the authors present a stochastic constitutive law for nucleation of twins and describe its implementation into a homogenized crystal plasticity simulation.
“Meso-Scale Modeling the Orientation and Interface Stability of Cu/Nb-Layered Composites by Rolling” (Pages 431–442)
C.A. Bronkhorst, J.R. Mayeur, I.J. Beyerlein, H.M. Mourad, B.L. Hansen, N.A. Mara, J.S. Carpenter, R.J. McCabe, and S.D. Sintay
Metallic-based multilayered nanocomposites are recognized for their increased plastic flow resistance and indentation hardness, increased ductility, improved radiation damage resistance, improved electrical and magnetic properties, and enhanced fatigue failure resistance compared to conventional metallic materials. One of the ways in which these classes of materials are manufactured is through accumulated roll bonding where the material is produced by several rolling and heat-treatment steps during which the layer thickness is reduced through severe plastic deformation. In this paper, the authors study the interfacial stability of specific Cu/Nb bicrystal configurations under rolling conditions using a finite-element crystal plasticity model.
“Modeling of Microstructure Evolution in Metallic Multilayers with Immiscible Constituents” (Pages 443–449)
Haibo Wan, Yao Shen, Xu He, and Jian Wang
Thermal stabilities of Cu/Nb, Cu/Ag, and Cu/Mo multilayers are studied by a recently developed model for microstructure evolution in multilayers with immiscible constituents, which actually is an extension to the classic grooving theory.
“Constitutive Model for the Mechanical Behavior and Stress Relaxation of 430 Stainless Steel and FeCrAlY Foams in Sulfur-Bearing Environments” (Pages 450–458)
James G. Hemrick and Edgar Lara-Curzio
The mechanical behavior of 430 stainless steel and pre-oxidized FeCrAlY open-cell foam materials of various densities was evaluated in compression at temperatures between 450°C and 600°C in an environment containing hydrogen sulfide and water vapor. Using the results from multiple hardening relaxation and monotonic tests, an empirical constitutive equation was derived to predict the stress–strain behavior of FeCrAlY foams as a function of temperature, and strain rate.
“CR3 Communications: Red Mud—A Resource or a Waste?” (Pages 340–341)
K. Hammond, B. Mishra, D. Apelian, and B. Blanpain
“2013 TMS President Elizabeth Holm: Committed to the Core” (Page 342)
“New TMS Board Members Reflect on Upcoming Opportunities” (Pages 343–344)
“LEAD ON: TMS Expands Opportunities for Young Professionals” (Pages 345–351)
“Light Metals Project Distills Decades of Knowledge to Its Essential Elements”(Pages 352–356)
“2012 AAES Engineering Salaries Update Presents the State of the Profession” (Page 357)
Also in This Issue:
“TMS Foundation Recognizes 2012 Supporters”(Page 461)
“News and Update: COMIC-tanium, ICME Congress Registration, Best Paper Awards” (Pages 336–339)
“In the Final Analysis” (Page 335)
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