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WorksheetsFE Review - MatSci
Total questions: 11
Worksheet time: 21mins
What are the Miller Indicies for the plane shown in the cubic cell?
(0 ½ 0)
(0 2 0)
(1 2 1)
(∞ ½ ∞)
The activation energy for aluminum in a copper solvent at 575°C is 1.6 x 10⁸ J/kmol. What is the diffusion coefficient, D, if the constant of proportionality, D₀, is 7 x 10⁻⁶ m²/s?
4.04 x 10⁻⁴⁷ m²/s
2.04 x 10⁻²⁰ m²/s
9.75 x 10⁻¹⁶ m²/s
2.31 x 10⁻⁵ m²/s
A steel alloy contains 2.5% weight of carbon. What phase(s) is/are present at 900°C?
Liquid
γ + liquid
γ + carbide
α + carbide
Order the microstructures from hardest (1) to softest (4):
Martensite
Bainite
Pearlite
Ferrite
A sample composed of 20% α begins to melt at what temperature?
825°C
1050°C
1500°C
1630°C
A sample composed of 80% α is heated to 900°C, what is the precent of solid at this temperature?
25%
40%
60%
75%
Why is aluminum more rust resistant that steel?
The reaction rate with the atmospheric oxygen is higher for steel
The reaction rate with the atmospheric oxygen is higher for aluminum
Iron atoms are larger than aluminum atoms, and thus, the interstitial space is larger
Iron has greater magnetic properties than aluminum
A 2in diameter rod of 4140 steel is quenched in water. What is the approximate Hardness at the center of the bar.
58 HRC
54 HRC
49 HRC
31 HRC
A 5cm diameter bridge tension member (rod) experiences a loading of 275 kN every time a car crosses the bridge. The average traffic on the bridge is 50 car/hr, and the bridge has a design life of 5 years. The S-N curves for several materials are shown. Strictly from the standpoint of fatigue, select the material(s) that the tension member could be constructed from if the bridge is to safely reach the end of its design life. Select all that apply.
Steel
Aluminum
Copper
Cast Iron
What type of crystalline structure is shown?
Simple Cubic
Face Centered Cubic
Hexagonal Close Packed
Body Centered Cubic
How many atoms are in a hexagonal close packed unit cell?
2
4
6
8
