Metallic Materials and Testing at Hochschule Rhein-Waal

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hexagonal crytalstructure 

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planar defects 

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recovery annealing 
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Exemplary flashcards for Metallic Materials and Testing at the Hochschule Rhein-Waal on StudySmarter:

quenching 

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Austenite 

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sample prep for SEM 

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Body centered cubic     
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Face centered Cubic

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eutectoid 

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point defects 

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line defects 
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Ferrite 

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Exemplary flashcards for Metallic Materials and Testing at the Hochschule Rhein-Waal on StudySmarter:

Metallic Materials and Testing

hexagonal crytalstructure 
a=b=90°; c=120°
example are ZN CD MG, alpha-CO and -Ti
74% packing density
Levels of stacking are ABA 

Metallic Materials and Testing

planar defects 
defects at grain boundaries
form during solidification

Metallic Materials and Testing

recovery annealing 
cold formed work piece to restore partially the mechanical and physical behavior available before cold forming with our changing the structure
reduction of dislocation density
recovery up with increase in time and temp
below recrystallization temp
temp between 250°C and 350°C 

Metallic Materials and Testing

quenching 
IF we quench (cool) FCC iron from 911°C to room temp at a rate of about 10^5 Cs^-1 we expect to prevent the diffusive FCC->BCC transformation from taking place

in reality below 550°C the iron will transform to bcc by a displacive transformation instead
small lens shaped grains of bcc nucleate at bcc grain boundaries and move across the grains. (Martensite)
in Martensite the carbon sits in-between the iron and strains the lattice in one direction resulting in a face centered tetragonal unit cell.
 dislocation movement is low and thus martensite is very hard 

Metallic Materials and Testing

Austenite 
gamma crystals (FCC) together with other crystals, non-magnetic 

Metallic Materials and Testing

sample prep for SEM 
metallic sample no prep needed
thin sputter layer of gold nickel or carbon improves contrast

Metallic Materials and Testing

Body centered cubic     
PD 68%
Cr V Mo W alpha iron 

Metallic Materials and Testing

Face centered Cubic
PD 74%
examples Ni Cu Al Au Ag, gamma iron, beta Co and Tt
stacking levels ABC

Metallic Materials and Testing

eutectoid 
from a solid to two or more solids without intermediates 

Metallic Materials and Testing

point defects 
type of defect
extra atoms
replaced atoms, foreign atoms (alloying)
empty spaces

effect /property
strength

Metallic Materials and Testing

line defects 
edge dislocation and screw dislocation
can attract or distract each other
moveable -> movement defines stability of the metal

shear stress all atomic bonds are broken and the lattice moves a row further and bonds again

dislocations move through a grain if shear stress is applied


Metallic Materials and Testing

Ferrite 
BCC varieties of iron crystals
ferromagnetic 

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