# qz4-f02 - Name Eissc 3313 Fall sour Quiz 4 Answer any 4...

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Unformatted text preview: Name _ _ Eissc 3313, Fall sour Quiz 4 Answer any 4 Questions onlt', 1 point each The stress—strain plot is from a cylindrical specimen of tilt mm gauge Determine a} the yield strength by the {1.1% proof stress {o tensile strength, and d} the specimen length at Fracture. length and 12.5 mm diameter. ffset) method, h) the elastic modulus, c} the .---L a} Emitting a line parallel to the initial slope at an offset of 43.001, 1 get an intersection at r M3- 13) "ic initial slope is ~ resinous, w m. c) Reading directly off plot, -- ﬂirt}; d] Extension is [Sﬂ][ﬂ.ﬁﬁ] min, ~ 33:] mm. Hence, specimen length at fracture is 5'9 + 3 = 5_3 mg. For example: Stress—strain plots for a metal at three different temperatures, illustrating almost brittle behavior at the lowest temperature. ltd—om: This ﬁgure is akin to overhead projector diagram 9-3. I prefer 9-3 because it illustrates, too, the decrease in elastic modulus {E}, as temperature increases, as well as complete brittleness at lots.r temperatures. 3. [in this overhead projector magma, deduce a) radii.i the aluminum and the magnesium lines stop at e 93o K and h} whyr the iron curve has a discontinuity at s: 1183 K. m “N a] The}.r melt at re 9343 K. I rue E 151] mm “Bax b] A phase transfonnation (BCC to FCC on heating}. (era) tau 5'} MAGNESIUM 5W 7W 901 110i] WEATHER lo 4. Draw the plane (111) and the direction [110] in a cubic cclll Use your sketch to explain lath};r (I l l][l Ill] is Q; a possible slip system tor an FCC metal. z The direction [llﬂ] does not lie in the plane (111}. Slip occurs by planes qL‘. {111} atoms sliding over one another, so t; p sliding (slip) direction has to lie in the slip plane. I [1 TD] 5. What does this text ﬁgure illustrate, please, xlil‘l? It is illustrating that plastic deformation that changes the shape of the bulk material changes the shape of the individual grains accordingly. These grains have become Well elongated, indicative of “heavy” cold work. ti. Please sketch a simple tctragonal crystal cell {c s: a r Please detennine a probable slip plane and a probable ‘c‘ dimension is the least! b, ca o [3 = T = PEI") with atoms at each comer. slip direction within the slip plane. Note that the The slip planes 1will have a high atomic density. B}F inspection, the plane with the greatest planar density is {ﬂltl} or {ltlﬂ}. The slip directions 1arill have the greatest linear density. Again. by inspection [U01]. ...
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qz4-f02 - Name Eissc 3313 Fall sour Quiz 4 Answer any 4...

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