Synthesis of physical and mechanical behaviour in metalmatrix materials with heterogeneous microstru

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Synthesis of physical and mechanical behaviour in
metal-matrix materials with heterogeneous
microstructure
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• Audrius Jutas
• Kaunas University of Technology, Lithuania
• KTU, Faculty of Mechanical Engineering,
  Department of mechanics of solids
• Address Kestucio 27, Kaunas LT-3004, Lithuania
• Tel.[phone], fax. [phone]

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Department of Mechanics of Solids

• The Department was founded in 1920. The material
  testing laboratory of this department in 1920 met
  the world standards and was the best in the
  Baltic countries. The first Lithuanian textbook
  on strength of materials was published in 1935
  (author Prof. K.Vasiliauskas). In September 1,
  1993 this department was named as Department of
  Mechanics of Solids. Its science and studies
  trends differ from the predecessor by a more
  expansive curriculum that combines the problems
  of strength of materials and structures,
  durability, fracture mechanics, stability, and it
  is a part of the area of mechanical reliability
  of structures.

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Department activity presents

•  11 monographs
• 9 textbooks
• More than 2000 scientific articles
• International projects
• Participation in International Scientific
  Organizations
• Establishment of Strength and Fracture mechanics
  centre

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Staff Age Average of Staff is 38 Years
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Areas of studies programme in department

•  
• Strength of materials and structures,
• Mechanics of Materials,
• Fracture mechanics,
• Stability,
• Reliability,
• Finite Elements

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I. Introduction
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• Defects of heterogeneous materials occur at
  different spatial scales and can have different
  origin, similar to the corresponding hierarchy of
  heterogeneous displacement fields caused by
  lattice defects in the bulk during plastic
  deformation
• There is important to define how the fundamental
  knowledge can be joined together with the use of
  different length scales.

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II. Objectives
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• The aim of the project is to understand the
  phenomena of deformation behaviour in
  metal-matrix materials from nano- to macro-scale
• The study should to join the investigations of
  interfacial or intrinsic phenomena in
  heterogeneous microstructures, e.g.
  ferite-perlite microstructures, because these in
  multifunctional structures are used

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III. Project realization
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• 1. First step
• Problems solving in nano-scale
• 2. Second step
• Problems solving in micro-scale
• 3. Third step
• Problems solving in macro-scale

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First step Problems solving in nano -
scale
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• A. Clear selection of lattice type
• B. Clear separation of material defects
• C. Clear separation of deformation behavior
• of lattice

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A. Clear selection of lattice type
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E.g. Ferrite-perlite microstructure of steel
AISI 1144
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B. Clear separation of material defects
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• Defects that are given after metal alloy
  fabrication
• Nano-structural defects (point defects, elastic
  distortion e.g. near two grain boundary)
• Expected result
• Evaluation of defects type and density

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C. Clear separation of deformation behavior of
lattice
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• Atom positions of deformed lattice in elastic
  state (returnable)
• Atom positions of deformed lattice in an
  intermediate state (atomic displacements by
  single dislocations)
• Atom positions of deformed lattice in plastic
  state (large crystallographic slip steps created
  by sets of collectively gliding dislocation on
  parallel or identical glide planes twins
  formation)

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C. Clear separation of deformation behavior of
lattice (continued)
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• Expected result
• Choosing of models for a calculation of lattice
  deformation
• Assessment of lattice constants, bond energy
  between the atoms, interatomic force, Burgers
  vector, shear stress, diffusion and others

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C. Clear separation of deformation behavior of
lattice (continued)
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• In conclusions it should be asked
• What impact mechanism to neighborhood lattice
  should be proposed?
• What physical and mathematical relationship is
  between investigated members?
• What members will be used for an assessment of
  micro-mechanical behavior?

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2. Second step Problems solving in
micro-scale
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• How much of different micro-components in
  calculating volume
• Axes orientation of several grains
• Fine measurement of grain dimensions
• Micro-structural model creation using mean
  values of grain sizes and axiality

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Problems solving in micro-scale
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• Expected result
• Choose the models on micro-structural assessment
  for calculation of grain deformation
• Evaluation of micro-mechanical behavior using
  classical (analytics) and modern methods of
  calculation (software, e.g. ABAQUS)
• Separation analysis of elastic and plastic states
  in micro-structural components (grains)

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Problems solving in micro-scale
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• In conclusions it should be asked
• What impact mechanism to neighborhood grain is
  given?
• What mathematical relationships should be
  choosing due to deformation of grains?
• What members will be used for an assessment of
  macro-mechanical behavior?

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3. Third step Problems solving in
macro-scale
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• Experimental assessment of mechanical properties
  using stress- strain diagram
• (?pr, ?e, ?Y, ?u, ?fr, E, Et, Ep, ?, ?)

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Problems solving in macro-scale
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• Expected result
• Separation of elastic and plastic
  macro-mechanical properties of heterogeneous
  material
• Assessment of strain points at which the global
  macro-mechanical energy of attraction and
  repulsion will occur.

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Problems solving in macro-scale
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• In conclusions it should be asked
• What relationship between nano-, micro- and
  macro-mechanical behavior?
• What quantitative values are used for step by
  step assessment due to uniaxial deformation of
  heterogeneous material?
• What members of different scales could be bridged
  together?

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IV. Instruments for project realization
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• 1. First step
• X-Ray diffraction analysis, Simulation of lattice
  deformation and calculation
• 2. Second step
• Micro-structural analysis, measurement of grain
  size, simulation of grain deformation and
  calculation
• 3. Third step
• Stress-strain diagram, calculation of
  macro-mechanical members

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What changes could be in potential energy U and
compressibility 1/E using stress-strain diagram?
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V. Offered expertise
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• Research group from KTU can offer the solutions
  for formulating and modelling of mechanism of
  nano - structured materials with metal-matrix

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VI. Partner search
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• 1. Partners in the field of solid state physics
  to realize the investigation of nano - scale atom
  structures (complex lattice deformation, X-ray
  diffraction)
• 2. Partners in the field of materials engineering
  (investigations of microstructure)
• 3. Partners in the field of application of
  computational methods (obtain the results of
  simulation by suggested algorithm)

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• Thank You for Your attention!

KTU, Faculty of Mechanical Engineering,
Department of mechanics of solids Address
Kestucio 27, Kaunas LT-3004, Lithuania Tel.00-37
0-7-32-2830, fax. [phone]