A high-carbon steel with a fully pearlitic microstructure was used to form a high-strength bolt (H.-C. Lee et al., J. Mater. Proc. Tech. 211, 1044 (2011)). It was found that the bolt head had an average interlamellar spacing of 257 nm whereas the average spacing in the body of the bolt was 134 nm. Assuming that dislocation pileup is the primary mechanism responsible for the strength of this alloy, what ratio of strength (or hardness) might be expected in the head and body of the bolt?

An FCC crystal is pulled in tension along the [100] direction (a) Determine the Schmid factor for all slip systems.(b) Identify the slip system(s) that will be activated first.(c) What is the tensile stress at which this crystal will flow plastically? (τ =50 MPa.)

The spool shown in (Figure 1) has a mass of 100 kg and radius of gyration about its mass center of kc = 0.3 m. The force of F = 170 N is applied to the cable. Figure 0.5 m 0.25 m F 1 of 1 > Express your answer to three significant figures. H=.1732 IVE ΑΣΦ. 41 Submit Previous Answers Request Answer Part B X Incorrect; Try Again; 4 attempts remaining α = vec What is the angular acceleration of the spool? Express your answer in radians per second squared to three significant figures. Submit IVE ΑΣΦΑΛΗ Avec Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining ? www. ? rad/s²

Given the work functions for some metals:- Aluminum-D4.08eV, Beryllium=5.0eV, Cadmium%3D4.07eV, Calcium32.9eV, Carbon3D4.81eV, Cesium=2.1eV, Cobalt=5.0eV, Copper3D4.7eV, Gold=5.1eV, Iron%3D4.5eV, Lead%-4.14eV, Magnesium=3.68€V, Mercury=D4.5eV, Nickel=5.01eV, Niobium=4.3eV, Platinum=6.35eV, Potassium=2.3eV, Selenium=5.11eV, Silver=4.73eV, Sodium=2.28eV, Uranium3D3.6eV, and Zinc3D 4.3eV. If you shine light with a wavelength of 153 nm on Potassium, what is the velocity of the electrons being emitted. Provide your answer in units of 105 m/s and round it off to two decimal places, i.e. the nearest hundredths.

) The Rayleigh number is defined as gpaAT® Ra

Problem # 3 (a) Describe the forces responsible for formation of inert gas (such as Argon) crystals. Express the cohesive energy (U(R)) of such crystals as a function of interatomic distance R, and sketch U(R) vs R. (b) Evaluate the Madelung constant for a one-dimensional lattice of Na* and Cl ions. The distance between two nearest neighbor Na* and Cl ions is R. (c) For H2 one finds from measurements on the gas that the Lennard – Jones parameters are ɛ = 40 x 10-16 erg and o = 2.91 Ả. Find the cohesive energy in kJ per mole of H2. Assume that the H2 molecules for an fcc lattice. Treat each H2 molecule as a sphere.

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Compute the line energy of dislocation in fcc, diamond. The shear modulus of carbon is 462 GNm 2. The diameter of carbon atom in diamond is 1.54Å. Answer: 1.46 x 10-³J/m

You are depositing indium on a glass substrate. (a) Suppose that the surface energy of the substrate is 2.5 times higher than that of indium and that the interface energy is twice as high as indium. Calculate the contact angle you would expect for the deposited indium (b) If you were able to lower the surface energy of the substrate by a factor of 2 without affecting the interface energy through the application of a surfactant how would you expect the contact angle to change?

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