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20 Cards in this Set
- Front
- Back
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coldworking
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increase in number of dislocations through mechanical work (strengthening mechanism)
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Decrease grain size
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dislocations pile up at grain boundary
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Solid Sol. Strengthening (alloying)
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diffuse a solute into a solvent
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Precip. strengthening
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Precip blocks perpindicular or perpindicular shear precip. (strengthening mechanism)
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ductile fracture
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occurs with plastic deform-warning
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brittle fracture
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little or no plastic deformation-no warning
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moderately ductile fracture
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mix between ductile and brittle-cup cone geometry
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intergranular
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between grains (ductile)
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intragranular
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within grains (brittle) (across grain boundary)
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recovery
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relieve residual stress-perpendicular move to equilibrium spacing-annealing process
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recrystallization
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perpendicular accumulate and form grain boundaries-annealing process
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grain growth
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small grains combine and form large grains-annealing process
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ostwald ripening
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grain growth empirical relation:
d^n - d_0^n = kt |
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name three other methods to STRENGTHEN polycrystalline materials.
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a. Decrease Grain Size
b. Coldworking-increase # of dislocations c. Solid Solution Strengthening-alloying d. Precipitate Strengthening |
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An intragranular fracture would run ALONG/ACROSS/NOWHERE NEAR grain boundaries
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Across
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Will FCC aluminum or BCC steel be more susceptible to having a ductile to brittle transition temperature?
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Steel
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True or False: A brittle material typically exhibits substantial plastic deformation with high energy absorption before fracture
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False
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As a successful expert in the field of materials fracture, you are hired as a witness for a trial. The prosecutors believe that a component failed with out warning. You disagree because you see (dimples, voids, intergranular cracking, intragranular cracking) along the fracture path
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Voids
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What kind of fracture (ductile or brittle) is associated with each of the two crack propagation mechanisms?
Intergranular: Transgranular: |
Intergranular: ductile
Transgranular: brittle |
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Given an annealed sample of BCC iron, you start to cold work the material. After you have rolled the iron sheet to 20% CW, you have see that the ____________ and ___________ have increased, the ________________ decreased and the ________________ stayed the same.
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UTS, Yield strength, time to failure, elastic modulus
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