6. The Light Metals Al And Mg at EPFL - EPF Lausanne | Flashcards & Summaries

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What are the strengthening mechanisms in Al Alloys ?

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- Solid solution strengthening

- Dislocation strengtheninet

-Grain boundary Strengthening

-Particle strengthening

-Texture strengthening

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Solid solution strengthening in Al alloys mechanism
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Pronounced strengthening effect of e.g. Mg, Mn

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Dislocation strengthening in Al alloys mechanism ?

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- Pronounced effect in unalloyed Al

- Achieved by cold working

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Grain boundary strengthening in Al alloys

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- Important strengthening mechanism in Al alloys

- Achieved by cold working and recrystallization

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Particle strengthening in Al alloys

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Pronounced effect in 2xxx, 6xxx and 7xxx

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Texture strengthening in Al alloys

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Al alloys can form pronounced textures, which can lead to highly anisotropic mechanicalproperties

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What does the addition of Li change in Al alloys

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decrease the density


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How is strengthening achieved in Al-Li alloys ?

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formation of the metastable Al3Li phase (and other phases such as Al2CuLi, Al6CuLi3, Al2CuMg)

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Design of a HT creep resistant Al alloy have : 

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- Capability of forming coherent strengthening intermetallic phases similar to Ni3Al

- Low solid solubility in Al (retard volume diffusion-controlled coarsening and prevent dissolution of the precipitated phases)

- Low diffusivity in Al (precipitates to remain effective barriers to dislocation motion at elevated temperatures)

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Which systems are used for HT creep resistant Al alloys ? 

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Al-Sc, Al-Ti and Al-Zr,

Their diffusion coefficient in Al is very low

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What are the strengthening mechanisms in Mg alloys and How does they work ?

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  • Solid solution strengthening
    - Pronounced with Al, Zn, Mn, Re but solubility often limited
  • Dislocation strengthening
    - Weak effect because of limited dformability of hip lattice at RT
  • Grain boundary strengthening
    - Important strengthening mechanism in Mg alloys
  • Particle strengthening
    - binary and ternary IM phases can be formed with several elements (Al, Zn, Re) upon solutionizing and ageing
  • Texture strengthening
    - Because of the hcp lattice, Mg alloys can exhibit pronounced textures after therm-mechanical treatment
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At RT, what is the predominant deformation mode ?

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twinning 

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Q:

What are the strengthening mechanisms in Al Alloys ?

A:

- Solid solution strengthening

- Dislocation strengtheninet

-Grain boundary Strengthening

-Particle strengthening

-Texture strengthening

Q:
Solid solution strengthening in Al alloys mechanism
A:

Pronounced strengthening effect of e.g. Mg, Mn

Q:

Dislocation strengthening in Al alloys mechanism ?

A:

- Pronounced effect in unalloyed Al

- Achieved by cold working

Q:

Grain boundary strengthening in Al alloys

A:

- Important strengthening mechanism in Al alloys

- Achieved by cold working and recrystallization

Q:

Particle strengthening in Al alloys

A:

Pronounced effect in 2xxx, 6xxx and 7xxx

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Q:

Texture strengthening in Al alloys

A:

Al alloys can form pronounced textures, which can lead to highly anisotropic mechanicalproperties

Q:

What does the addition of Li change in Al alloys

A:

decrease the density


Q:

How is strengthening achieved in Al-Li alloys ?

A:

formation of the metastable Al3Li phase (and other phases such as Al2CuLi, Al6CuLi3, Al2CuMg)

Q:

Design of a HT creep resistant Al alloy have : 

A:

- Capability of forming coherent strengthening intermetallic phases similar to Ni3Al

- Low solid solubility in Al (retard volume diffusion-controlled coarsening and prevent dissolution of the precipitated phases)

- Low diffusivity in Al (precipitates to remain effective barriers to dislocation motion at elevated temperatures)

Q:

Which systems are used for HT creep resistant Al alloys ? 

A:

Al-Sc, Al-Ti and Al-Zr,

Their diffusion coefficient in Al is very low

Q:

What are the strengthening mechanisms in Mg alloys and How does they work ?

A:
  • Solid solution strengthening
    - Pronounced with Al, Zn, Mn, Re but solubility often limited
  • Dislocation strengthening
    - Weak effect because of limited dformability of hip lattice at RT
  • Grain boundary strengthening
    - Important strengthening mechanism in Mg alloys
  • Particle strengthening
    - binary and ternary IM phases can be formed with several elements (Al, Zn, Re) upon solutionizing and ageing
  • Texture strengthening
    - Because of the hcp lattice, Mg alloys can exhibit pronounced textures after therm-mechanical treatment
Q:

At RT, what is the predominant deformation mode ?

A:

twinning 

6. The light metals Al and Mg

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