D-DIA (Deformation DIA) High-P and T, homogeneous stress/strain (Durham, Wang, Getting, Weidner)

Slides:

Advertisements

Similar presentations

7/12/04CIDER/ITP Short Course Composition and Structure of Earth’s Interior A Perspective from Mineral Physics.

Advertisements

Lecture 1. How to model: physical grounds

Rheological Properties of Super-Earth’s Mantle 1 Shun-ichiro Karato Yale University Department of Geology and Geophysics LEAPS workshop, Pasadena, 2010.

FRACTURE Brittle Fracture Ductile to Brittle transition

Deformation Mechanisms: What strain occurred in this rock?

Measurement of Dislocation Creep Based on: Low-Stress High-Temperature Creep in Olivine Single Crystals D.L. Kohlstedt and C. Goetze, 1974 Picture from.

Goal: To understand how different deformation mechanisms control the rheological behavior of rocks Rheology and deformation mechanisms.

GEO 5/6690 Geodynamics 10 Oct 2014 Last Time: RHEOLOGY

Grain size-dependent viscosity convection Slava Solomatov Washington University in St. Louis Acknowledgements: Rifa El-Khozondar Boulder CO, June 23.

Lecture 24: Strengthening and Recrystallization PHYS 430/603 material Laszlo Takacs UMBC Department of Physics.

Reminder and Copyright Warning The course handouts are free only if you have purchased a third edition copy of the course textbook (not first, second or.

Two-phase deformation of peridotite: localization by recrystallization and phase-mixing Robert Farla 1,2*, Shun-ichiro Karato 1 and Zhengyu Cai 1 1 Department.

Mitglied der Helmholtz-Gemeinschaft E. A. Brener Institut für Festkörperforschung, Pattern formation during diffusion limited transformations in solids.

Strength of the lithosphere: Constraints imposed by laboratory experiments David Kohlstedt Brian Evans Stephen Mackwell.

APPLIED MECHANICS Lecture 10 Slovak University of Technology

12/15MR22B-01 1 Some remarks on seismic wave attenuation and tidal dissipation Shun-ichiro Karato Yale University Department of Geology & Geophysics.

Deformation and Strengthening Mechanisms

Diffusion in a multi-component system (1) Diffusion without interaction (2) Diffusion with electrostatic (chemical) interaction.

L=A  -r Dynamic recrystallization. Some Applications Dewatering due to partial melting and the lithosphere-asthenosphere structure (Karato.

New grain New grains nucleate and grow into regions of high dislocation density. High dislocation density Experimental data usually fits a sigmoid curve.

Lectures on Rheology of Earth Materials Fundamentals and frontiers in the study of deformation of minerals and rocks (at Tohoku University) Shun-ichiro.

PY3090 Preparation of Materials Lecture 3 Colm Stephens School of Physics.

Dislocations and Strengthening

Centre Sciences des matériaux et des structures Département Rhéologie, Microstructures, Thermomécanique FR CNRS 3410 – CIMReV UMR CNRS 5307 Laboratoire.

Fluctuations in Flowing Foam: Does Einstein's Relation Define an Effective Temperature? Michael Dennin U. C. Irvine Department of Physics and Astronomy.

Thermal Processing of Metal Alloys

DEFORM Simulation Results 2D Hot Forging and Air Cool of Gear Tooth Geometry Holly Quinn 12/04/2010.

June 29, 2009EURISPET1 Strength of the lithosphere Introduction to mantle rheology from laboratory approach Shun-ichiro Karato Yale University New Haven,

Shear stress versus shear strain For homogeneous & isotropic materials pure shear causes angular distortion of a material as shown above. Pure shear is.

Solidification and Heat Treatment

ANELASTICITY Some Background, Mechanisms and Recent Work Aaron Vodnick MSE 610 4/25/06.

Comparison of Theory and Experimental Results on Seismic Wave Attenuation Ian Jackson a, Ulrich Faul a, John Fitz Gerald a, Stephen Morris b, Yoshitaka.

Metamorphic Fabric Chapter 13A. Solid-state Crystal Growth Nucleation –Crystallization of new phases Crystal growth –Modification of existing grain boundaries.

Cold Working is Actually Strain Hardening Basic equation relating flow stress (strain hardening) to structure is:  o =  i +  Gb  1/2 Yield stress increases.

Byeong-Joo Lee Byeong-Joo Lee General Background ※ References: 1. W.D. Kingery, H.K. Bowen and.

1 Strength and Ductility. 2 Determining Tensile Strength from the stress-strain curve is easy. Just locate the highest point on the curve. TS = 82 ksi.

Experimental Studies of Planetary Materials Mike KrawczynskiPhil Skemer.

Defects in Solids 0-D or point defects –vacancies, interstitials, etc. –control mass diffusion 1-D or linear defects –dislocations –control deformation.

The role of water on lithospheric strength Chester et al., 1995, A rheologic model for wet crust applied to strike-slip faults Hirth et al., An evaluation.

Introduction to Materials Science, Chapter 7, Dislocations and strengthening mechanisms University of Virginia, Dept. of Materials Science and Engineering.

Recent Progress in High-Pressure Studies on Plastic Properties of Earth Materials COMPRES meeting at lake Tahoe June, 2004.

Beyond Elasticity stress, strain, time Don Weidner Stony Brook.

Multi-anvil at the NSLS Michael Vaughan Liping Wang Jiuhua Chen Baosheng Li Li Hélène Couvy Wei Liu Carey Koleda Bill Huebsch Ken Baldwin.

Growing Crystalline Materials Jon Price. Growth and the construction of defects How are crystals made? What types of irregularities are possible? Why.

Constant stress experiment ductile elastic Constant stress (strain varies) Constant strain (stress varies)

PLASTIC DEFORMATION Dislocations and their role in plastic deformation.

Introduction to pattern formation in materials

ENGR-45_Lec-18_DisLoc-Strength-2.ppt 1 Bruce Mayer, PE Engineering-45: Materials of Engineering Bruce Mayer, PE Registered Electrical.

Multi-anvil at the NSLS Michael Vaughan Liping Wang Jiuhua Chen Baosheng Li Carey Koleda Bill Huebsch Ken Baldwin Chris Young.

Microstructure-Properties Lecture 2: Recrystallization Theoretical & Practical Aspects Profs. A.D. Rollett, M. De Graef Updated 27 th September,

High T Deformation Mechanisms involved in Localization

Lecture 7 Review of Difficult Topics MATLS 4L04: Aluminum Section.

Ductile Deformation Processes Chapter 9 in Van der Pluijm and Marshak.

1 Structural Geology Microstructural View of Deformation Lecture 20 – Spring 2016.

Plastic deformation Extension of solid under stress becomes

MatCalc approach for the modelling of the vacancy concentration evolution (MatCalc ) P. Warczok.

Microstructure From Processing: Evaluation and Modelling Grain size control: Lecture 3 Martin Strangwood, Phase Transformations and Microstructural Modelling,

Microstructure From Processing: Evaluation and Modelling Nucleation: Lecture 4 Martin Strangwood, Phase Transformations and Microstructural Modelling,

Severly Deformed Steels

Plastic Deformation of Polycrystalline Metals

CHAPTER 5 : DISLOCATION & METAL STRENGTHENING MECHANISMS

Sal College of Engineering

Dislocations and Strengthening

Deuterium in Palladium

Structures & textures 1.

Department of Geology and Geophysics

Fig. 1 The form of the thermomechanical treatment, used to study

Growth Kinetics Byeong-Joo Lee Microstructure Evolution POSTECH - MSE

Posibilities of strength-enhancing

CREEP CREEP Dr. Mohammed Abdulrazzaq Materials Engineering Department.

Presentation transcript:

D-DIA (Deformation DIA) High-P and T, homogeneous stress/strain (Durham, Wang, Getting, Weidner)

Rotational Drickamer Apparatus large strain (radial distribution), high P-T (Yamazaki, Xu, Nishihara)

ZirconiaAlumina MgO Sample assembly for a rotational Drickamer Apparatus (torsion tests on a thin disk-shaped sample to large strain)

A change in geometry of a strain-marker

stress-distribution in a RDA

(Mg,Fe)O, ~12 GPa, ~1473 K

Large-strain shear deformation of wadsleyite

Effects of Phase Transformation 1.Grain-size 2.Crystal structure, bonding 3.Internal stress/strain (“transformation plasticity)

Rheology of deep mantle minerals At present, only results from analog materials are available High-pressure deformation experiments are preliminary Need for direct, quantitative high-pressure studies

A first-order phase transformation is associated with a finite volume change that causes an internal stress/ strain, which may modify the rheological behavior (transformation plasticity).

The role of internal stress In the Orowan equation, the dislocation density may be controlled by the “internal stress”..

Physical Processes Controlling the Grain-Size 1.Grain growth (static: driving force=boundary energy) 2.Dynamic recrystallization (dynamic: driving force= dislocation energy) 3.Phase transformation

Driving forces for grain-boundary migration Grain-boundary energy -> grain-growth Dislocation energy -> dynamic recrystallization Chemical energy -> grain-size reduction

Driving forces for grain-boundary migration : grain-boundary energy : dislocation energy

A schematic diagram of the sample capsule for wet annealing ran.

oxygen fugacity for various buffer systems

Infrared absorption spectra

Grain-growth in wadsleyite

(µm n ) Log (GS ^n -GS 0 ^n ) A comparison of grain-growth kinetics in olivine and wadsleyite (under nominally “dry” conditions)

ln k (m 3 /s) H*=140+/-20 kJ/mol

r~0.5 q~1 H*~140 kJ/mol

fO2 effect

Secondary phase particles have an important effect on grain-growth (Zener pinning). Grain-growth in two-phase mixture is completely different from that in a single-phase aggregates (controlled by the Ostwald ripening). Very few studies have been done on two-phase aggregates (Yamazaki et al., 1996).

Zener pinning When excess energy needed for a moving boundary to pass over secondary particles exceed the driving force for migration, then grain-boundary migration stops. L Z =4a/3f a: size of secondary-phase particles f: the volume fraction of secondary phase particles If the size of the secondary phase particles can increase, then continuing growth is possible.

Kinetics is proportional to the solubility and diffusion coefficient of growing material in the matrix.