Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y
TL;DR: In this paper, the viscoplastic self-consistent model was used to interpret differences in the mechanical behavior of hexagonal close packed magnesium alloys, showing that the plane strain compression textures of the alloys showed an increasing tendency for the basal poles to rotate away from the normal direction towards the rolling direction.
About: This article is published in Acta Materialia.The article was published on 2001-12-03. It has received 1238 citations till now. The article focuses on the topics: Slip (materials science) & Hardening (metallurgy).
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TL;DR: The influence of the grain size on the flow stress of extruded Mg-3Al-1Zn tested in compression is examined in this paper, where samples with grain sizes varying between 3 and 23 μm were prepared by altering the extrusion conditions.
1,160 citations
25 Aug 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a series of tensile test results are reported for the common wrought alloy AZ31 and a simple constitutive model is employed to argue that View the MathML source twinning (which gives extension along the c-axis) can increase the uniform elongation in tensile tests.
Abstract: Magnesium and its alloys do not in general undergo the same extended range of plasticity as their competitor structural metals. The present work is part I of a study that examines some of the roles deformation twinning might play in the phenomenon. A series of tensile test results are reported for the common wrought alloy AZ31. These data are employed in conjunction with a simple constitutive model to argue that View the MathML source twinning (which gives extension along the c-axis) can increase the uniform elongation in tensile tests. This effect appears to be similar to that seen in Ti, Zr and Cu–Si and in the so called TWIP phenomenon in steel.
1,102 citations
TL;DR: In this article, the rolling textures of six magnesium alloys containing different levels of zinc and rare earth (RE, e.g. mischmetal or Y) additions are examined. And the influence of texture on the mechanical response is investigated.
947 citations
25 Aug 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a series of tensile and compression tests results are reported for common wrought alloys: AZ31, ZK60 and ZM20, and these data are combined with EBSD analysis and simple flow stress models to argue the following: (i) contraction double twinning (which enables contraction along the c axis) can decrease the uniform elongation, and (ii) compression double twinening can also account for shear failure at low strains.
Abstract: Magnesium and its alloys do not in general undergo the same extended range of plasticity as their competitor structural metals. The present work presents part II of a study that examines some of the roles deformation twinning might play in the phenomenon. A series of tensile and compression tests results are reported for common wrought alloys: AZ31, ZK60 and ZM20. These data are combined with EBSD analysis and simple flow stress models to argue the following: (i) that “contraction” double twinning (which enables contraction along the c axis) can decrease the uniform elongation, and (ii) that compression double twinning can also account for shear failure at low strains. The last of these is described as a combined consequence of strain softening of the continuum and the local generation of twin sized voids.
900 citations
TL;DR: In this article, the monotonic and cyclic mechanical behavior of O-temper AZ31B Mg sheet was measured in large-strain tension/compression and simple shear.
897 citations
Cites background from "Application of texture simulation t..."
...A CRSS for twinning, while low (Koike, 2005), is not well established because twin nucleation is inhomogeneous and depends on microstructure features (Partridge, 1967; Reed-Hill and Abbaschian, 1994)....
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...For example, the basal slip CRSS is in the range of 10–45 MPa while the CRSS range for twinning is 15–35 MPa....
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...Table 1 summarizes CRSS values reported for Mg and its alloys containing aluminum and zinc solutes....
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...Pyramidal Æc + aæ slip, which in principle provides the additional independent slip systems, is difficult to activate at room temperature because of its high CRSS (Agnew et al., 2001; Yoo et al., 2002)....
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...Instead, CRSS values are fit by polycrystal texture calculations in order to match the macroscopic response, or CRSS values are obtained using in situ neutron diffraction to track lattice strain and peak intensity variation (Gharghouri et al., 1999; Brown et al., 2005)....
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Book•
01 Jan 1986
TL;DR: Binary Alloy Phase Diagrams, Second Edition, Plus Updates, on CD-ROM offers you the same high-quality, reliable data you'll find in the 3-volume print set published by ASM in 1990.
Abstract: Gives you access to the 4,700 atomic and weight percent graphs included in the reference set Binary Alloy Phase Diagrams, Second Edition, published by ASM in 1990 - plus updates! All the data from the 3,600-page, three-volume set, abstracts of phase diagram evaluations for 3,000 binary alloy systems, special points and crystal structure tables, along with 300 recent updates from the current literature are included on one CD-ROM for ease of use and storage. Binary Alloy Phase Diagrams plus updates on CD-ROM containing all the data from Massalski's world standard, three-volume, 3,600-page Binary Alloy Phase Diagrams, Second Edition, fits in the palm of your hand! This CD includes 4,700 diagrams; abstracts of phase diagram evaluations for 3,000 binary alloy systems; special points; crystal structure tables; plus 300 recent updates from current literature. All in databases and in CD-ROM format, so it's easier to access, more flexible to use, and more efficient for you to store than ever before. Binary Alloy Phase Diagrams, Second Edition, Plus Updates, on CD-ROM, offers you the same high-quality, reliable data you'll find in the 3-volume print set published by ASM in 1990. The over 4,700 diagrams were digitized from original program graphs or redrawn from carefully selected data sources. Each diagram is in accordance to thermodynamic principles and is consistent with melting and phase-transition temperatures of the pure elements. All diagrams met strict quality standards throughout preparation. Now, the CD-ROM format puts this quality information at your fingertips. These are not scanned pages, but true, complete databases of phase diagram and crystallographic information, all in one incredibly small but powerful package, you'll wonder what you ever did without it! This new electronic format allows you to: Search for diagrams, crystal structure data, or text by keying in the alloys. Search the Master Crystal Structure Table for Intermetallic compounds with equivalent structure type, temperature, and phase width criteria. Print diagrams, text, crystal structure. Examine any new data in conjunction with the original data as presented in the print volume. Zoom in on a complicated section of the diagram for a closer look. (Vat payable on UK orders for CD products) Multi-User prices available: Contact Steve French (Customer Services Manager) Telephone: +44 (0)1462 437933; E-Mail: SFrench@ameritech.co.uk
13,433 citations
TL;DR: In this article, a rate dependent constitutive model is developed for polycrystals subjected to arbitrarily large strains, and the model is used to predict deformation textures and large-strain strain hardening behavior following various stressstrain histories for single phase f.c. aggregates that deform by crystallographic slip.
1,557 citations
TL;DR: A review of the literature on preferred orientation of olivine deformation can be found in this paper, where the authors highlight some of the issues with the prevailing view that seismic fast directions align with the flow direction.
Abstract: The study of preferred orientation of minerals in rocks dates back to Omalius d’Halloy (1833) who attributes a special significance to the alignment of crystals as an indicator of the formation process. Much later the influence of crystal alignment on physical properties was quantified (e.g., Weissenberg 1922, Voigt 1928, Reuss 1929). Only recently has this field emerged as a coherent part of earth science research linking such branches as mineralogy, petrology, structural geology, geodynamics and seismology. The reason for this was the emergence of quantitative methods to analyze preferred orientation, or “texture” as it was first called by Naumann (1850). These methods were largely developed in collaboration with materials science and mechanics. Quantitative measurements, detailed field studies, rigorous data analysis, theories to predict textures, and improvements in characterizing seismic anisotropy in the Earth are leading to a coherent picture that is now being refined.
Though seismologists have long accepted that there is a causal relationship between anisotropic propagation of seismic waves, the deformation field and crystal orientation, the prevailing view is still largely the mythological concept that seismic fast directions align with the flow direction. While this may be approximately the case for olivine deformed under certain conditions, it is certainly no universal law, as we will try to illustrate in this review. The “fast” direction of a crystal depends on the mineral species and its crystal structure. The alignment of crystals depends on microscopic, intra-crystalline deformation systems and the deformation history. Both relationships are complex and not intuitive, but there are well-established theories to compute single crystal physical properties as well as orientation patterns. Simulations can be compared with experimental data and then applied with some caution to the macroscopic Earth.
This review is intended to provide a brief introduction, highlighting some of the issues with …
1,048 citations
Book•
01 Jan 1992
TL;DR: In this paper, a texture analysis is used to evaluate the effect of texture on the deformation behavior of a cast Mg-Zn-Al-Alloy in a high temperature setting.
Abstract: Partial Table of Contents: ALLOY DEVELOPMENT. Development of Practical High Temperature Magnesium Casting Alloys (J. King). Creep Resistant Mg Alloy Development (K. Pettersen, et al.). New Magnesium Wrought Alloys (C. Jaschik, et al.). Phase Equilibria, Microstructure and Properties of Novel Mg-Mn- Y Alloys (A. Pisch, et al.). TEXTURE AND MICROSTRUCTURE. Texture Analysis as a Tool for Wrought Magnesium Alloy Development (S. Agnew, et al.). Influence of Texture on Deformation Behaviour of Magnesium Alloy AZ31 (R. Gehrmann, et al.). Magnesium Applications in Aerospace and Electronic Industries (B. Landkof). JOINING. Friction Stir Welding of Lightweight Materials (S. Kallee, et al.). MAGNESIUM MATRIX COMPOSITES. Thermal Fatgue of Magnesium Matrix Composites (F. Chmel?k, et al.). Possibilities of the Heat Treatment of MagnesiumMatrix Composites Reinforced with SiC Particles (K. Braszczynska). MECHANICAL DEVELOPMENT. Mechanical Properties of Extruded Magnesium Alloys (B. Closset). Fatigue Design with Cast Magnesium Alloys (C. Sonsino, et al.). Superplasticity of Magnesium-Based Alloys (U. Draugelates, et al.). APPLICATION. High-Speed-Drilling in AZ91 D Without Lubricoolants (F. Tikal, et al.). Cast Magnesium Alloys for Wide Application (P. Detkov, et al.). CORROSION AND SURFACE TREATMENT. Corrosion Properties of Die Cast AM Alloys (M. Videm, et al.). Corrosion Fatigue and Corrosion Creep of Magnesium Alloys (A. Eliezer, et al.). PROCESSING. Quality Index Charts for Mg-based Casting Alloys (C. C?ceres). Semi Solid Injection Molding of MagnesiumAlloys (A. Dworog, et al.). Hydrostatic Extrusion of Magnesium (K. Savage, et al.). Processing of Cellular Magnesium Alloy (Y. Yamada, et al.). PHYSICAL PROPERTIES. Damping in Magnesium and Magnesium Alloys (W. Riehemann). CREEP BEHAVIOUR. Creep of Mg-Zn-Al-Alloys (M. Vogel, et al.). The Microstructure and Creep of an Extruded Mg-Y-Nd Alloy (R. Azari-Khosroshahi). RECYCLING, MELTING, ENVIRONMENTAL. Remelting and Cleaning of Magnesium Scrap (U. Galovsky & M. K?hlein). SIMULATION. An Approach to Determine Solidification Curves of Commercial Magnesium Alloys (D. Mirkovic, et al.). Indexes.
858 citations
TL;DR: In this article, a new reflection method is described for determining pole figures of flat samples with a Geiger counter x-ray spectrometer, which can be used directly without corrections for changes in geometry during rotation of the sample.
Abstract: A new reflection method is described for determining pole figures of flat samples with a Geiger counter x‐ray spectrometer. The chief advantage of the method is that the experimental data may be used directly without corrections for changes in geometry during rotation of the sample. Beginning from an initial position identical with the usual reflection arrangement the sample is rotated about an axis defined by the intersection of the sample surface with the plane of the spectrometer. During this motion a randomly oriented sample of sufficient thickness will yield a constant counting rate because the absorption and effective scattering volume of the sample remain unchanged. As a result, no correction formula is required. The experimental arrangement requires three horizontal slits; two are used to collimate the incident beam, and the third is placed in front of the counter. A mathematical analysis of the optical elements of the arrangement is given together with the results from a practical application.
731 citations