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Title: Grain boundary sliding mechanism during high temperature deformation of AZ31 Magnesium alloy

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1326873
Grant/Contract Number:
NE-0000538
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 669; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-02-03 02:48:21; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Roodposhti, Peiman Shahbeigi, Sarkar, Apu, Murty, Korukonda Linga, Brody, Harold, and Scattergood, Ronald. Grain boundary sliding mechanism during high temperature deformation of AZ31 Magnesium alloy. Netherlands: N. p., 2016. Web. doi:10.1016/j.msea.2016.05.076.
Roodposhti, Peiman Shahbeigi, Sarkar, Apu, Murty, Korukonda Linga, Brody, Harold, & Scattergood, Ronald. Grain boundary sliding mechanism during high temperature deformation of AZ31 Magnesium alloy. Netherlands. doi:10.1016/j.msea.2016.05.076.
Roodposhti, Peiman Shahbeigi, Sarkar, Apu, Murty, Korukonda Linga, Brody, Harold, and Scattergood, Ronald. 2016. "Grain boundary sliding mechanism during high temperature deformation of AZ31 Magnesium alloy". Netherlands. doi:10.1016/j.msea.2016.05.076.
@article{osti_1326873,
title = {Grain boundary sliding mechanism during high temperature deformation of AZ31 Magnesium alloy},
author = {Roodposhti, Peiman Shahbeigi and Sarkar, Apu and Murty, Korukonda Linga and Brody, Harold and Scattergood, Ronald},
abstractNote = {},
doi = {10.1016/j.msea.2016.05.076},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 669,
place = {Netherlands},
year = 2016,
month = 7
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.msea.2016.05.076

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • Experiments were conducted to measure the extent of grain boundary sliding in high purity lead subjected to fatigue testing at room temperature. It is shown that the average sliding offset perpendicular to the surface, v, increases rapidly during the initial about 25 cycles of testing, increases at a reduced rate thereafter, and ultimately stabilizes after about 300 cycles. The value of v at any selected number of testing cycles decreases with decreasing strain amplitude at constant frequency but is independent of frequency at constant strain amplitude within the limited range of frequencies examined experimentally (0.17-0.50 Hz). The value of vmore » also increases with an increase in grain size at constant frequency and strain amplitude. In fatigue tests conducted at zero mean strain, there is an essentially equal contribution from positive and negative sliding offsets, so that the net displacement is zero. Slide hardening is no important in fatigue at low cycles in the presence of extensive grain boundary migration. The average rates of sliding in fatigue are comparable to the average sliding rates in the very early stages of creep.« less
  • Using lightweight materials is the emerging need in order to reduce the vehicle's energy consumption and pollutant emissions. Being a lightweight material, magnesium alloys are increasingly employed in the fabrication of automotive and electronic parts. Presently, magnesium alloys used in automotive and electronic parts are mainly processed by die casting. The die casting technology allows the manufacturing of parts with complex geometry. However, the mechanical properties of these parts often do not meet the requirements concerning the mechanical properties (e.g. endurance strength and ductility). A promising alternative can be forming process. The parts manufactured by forming could have fine-grained structuremore » without porosity and improved mechanical properties such as endurance strength and ductility. Because magnesium alloy has low formability resulted form its small slip system at room temperature it is usually formed at elevated temperature. Due to a rapid increase of usage of magnesium sheets in automotive and electronic industry it is necessary to assure database for sheet metal formability and plastic yielding properties in order to optimize its usage. Especially, plastic yielding criterion is a critical property to predict plastic deformation of sheet metal parts in optimizing process using CAE simulation. Von-Mises yield criterion generally well predicts plastic deformation of steel sheets and Hill'1979 yield criterion predicts plastic deformation of aluminum sheets. In this study, using biaxial tensile test machine yield loci of AZ31 magnesium alloy sheet were obtained at elevated temperature. The yield loci ensured experimentally were compared with the theoretical predictions based on the Von-Mises, Hill, Logan-Hosford, and Barlat model.« less
  • The influence of dynamic or strain-induced precipitation on grain boundary sliding has been investigated. For this purpose, the boundary sliding rate during the high temperature creep of electrical steels was measured. The progress of MnS precipitation in the course of the creep was also determined. The experimental results revealed that the sliding of grain boundaries is arrested when precipitation takes place. During the interval between P{sub s} (precipitation start time) and P{sub f} (precipitation finish time), the blocking effect exerted on sliding by the precipitates becomes more and more significant because both the size and density of the particles increase.more » Beyond P{sub f}, however, this effect is weakened due to the dissolution of the smaller particles, which results in an increase in the interparticle spacing. On the basis of the experimental results, a quantitative relationship between the sliding rate of a particle-free and of a precipitate-containing boundary has been derived. This relationship illustrates the interaction between precipitation and the rate of grain boundary sliding.« less
  • Information is presented concerning the influence of a fine dispersion of particles on creep and grain boundary sliding; the process of cavity nucleation and growth; grain boundary behavior in fatigue at high temperatures; creep behavior of Cu and Cu alloys; creep behavior of ceramic materials; creep fracture of Al and Al alloys; and deformation mechanism maps and creep fracture maps.