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Non Ferrous alloys MSE 528. Mg alloys for automotive. Copper and its Alloys. Beta stabilizer. Ti alloy. Alpha stabilizers: C, O, N and Al Beta Stabilizers: Cr, Fe, Pd, Co, Mn, H, V, Mo, Ta, Nb Alpha alloys: Ti-5Al-2.5Sn, Ti-4al-1Mo Beta alloys: Beta 21S (13%Mo),

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Ti alloy
Ti alloy

  • Alpha stabilizers: C, O, N and Al

  • Beta Stabilizers: Cr, Fe, Pd, Co, Mn, H, V, Mo, Ta, Nb

  • Alpha alloys: Ti-5Al-2.5Sn, Ti-4al-1Mo

  • Beta alloys: Beta 21S (13%Mo),

  • Alpha + Beta alloys: Ti-6Al-4V,

  • ELI: extra low level Interstitials



Precipitation hardening
PRECIPITATION HARDENING

• Particles impede dislocations.

• Ex: Al-Cu system

• Procedure:

--Pt A: solution heat treat

(get a solid solution)

--Pt B: quench to room temp.

--Pt C: reheat to nucleate

small q crystals within

a crystals.

• Other precipitation

systems:

• Cu-Be

• Cu-Sn

• Mg-Al

Adapted from Fig. 11.22, Callister 6e. (Fig. 11.22 adapted from J.L. Murray, International Metals Review30, p.5, 1985.)

Adapted from Fig. 11.20, Callister 6e.

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Precipitate effect on ts el
PRECIPITATE EFFECT ON TS, %EL

• 2014 Al Alloy:

• TS peaks with

precipitation time.

• Increasing T accelerates

process.

• %EL reaches minimum

with precipitation time.

Adapted from Fig. 11.25 (a) and (b), Callister 6e. (Fig. 11.25 adapted from Metals Handbook: Properties and Selection: Nonferrous Alloys and Pure Metals, Vol. 2, 9th ed., H. Baker (Managing Ed.), American Society for Metals, 1979. p. 41.)

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Precipitation strengthening
PRECIPITATION STRENGTHENING

• Hard precipitates are difficult to shear.

Ex: Ceramics in metals (SiC in Iron or Aluminum).

• Result:

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Application precipitation strengthening
APPLICATION:PRECIPITATION STRENGTHENING

1.5mm

• Internal wing structure on Boeing 767

Adapted from Fig. 11.0, Callister 5e.

(Fig. 11.0 is courtesy of G.H. Narayanan and A.G. Miller, Boeing Commercial Airplane Company.)

• Aluminum is strengthened with precipitates formed

by alloying.

Adapted from Fig. 11.24, Callister 6e.

(Fig. 11.24 is courtesy of G.H. Narayanan and A.G. Miller, Boeing Commercial Airplane Company.)

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