An alloy has an elastic modulus of 115 GPa. For the alloy, plastic deformation begins at a stress of 275 MPa. (a) If a sample of cross-sectional area 325 mm? is obtained from the alloy, determine the maximum load that may be applied on the sample without plastic deformation. (b) The original sample length is specified as 115 mm, what is the maximum length to which the sample can be stretched without plastic deformation.

a) Gold (Au) has an atomic radius 0.137 nm and a density of 19.32 g/cm'. (Atomic weight of 196.97 g/mol) Determine whether it has an FCC or BCC crystal structure. Compute the packing fraction/ atomic packing factor (APF), assuming the atoms to be hard spheres. (i) (ii) b) Fig. Q4 (b) shows the unit cell of Nickel (II) oxide (NiO) with ionic radii of ry 0.069 nm and ro = 0.140 nm. Calculate the density of NiO. (Avogadro's Constant = 6.022 x 1025 mol) %3D %3D nickel (II) oxide Ni

A single crystal of silver (FCC structure) is oriented such that a tensile load of 1,000,000 N is applied along the [001] direction. The single crystal is cylindrical and has a radius of 18 cm. The slip system for the FCC crystal structure is 111〈110〉. Using the FCC unit cell below, sketch a (111) plane and, using arrows, indicate two different 〈110〉 directions within this plan. Compute the resolved shear stress (in MPa) in the [101] direction on the (111) plane. If the critical resolved shear stress is 2.0 MPa, will the crystal yield? (explain how the answer is obtained

Metallic copper adopts an fcc structure with density 8960 kg m-3. Draw the unit cell of copper and mark the shortest copper atom to copper atom distance. (a) How many copper atoms are there in the unit cell?(b) Use the density and mass of the unit cell to determine the lattice parameter for copper and calculate a value for the metallic radius of copper.

PdB0.15 is a which type alloy

Polymeric composite materials can be obtained by adding fillers in the form of particles or fibers in a polymeric matrix and are intended to form a new material with properties different from those of pure components. Regarding polymeric composites, review the statements below and check which is true and which is false. (I) The mechanical properties of a fiber reinforced polymer composite are not influenced by fiber length. (II) Composites with unidirectional continuous fibers have isotropic mechanical properties.  (III) The interfacial adhesion between matrix and dispersed phase does not influence the magnitude of the final mechanical properties of the composite.  (IV) In polymeric composites, fibers are normally less ductile than polymeric matrices.  (V) The specific area of ​​a material at the nanoscale is significantly less than the specific area of ​​the same material at the microscale.

planar density

For each of the following alloy compositions, indicatewhether you would expect it to be a substitutional alloy, aninterstitial alloy, or an intermetallic compound:(a) Cu0.66Zn0.34, (b) Ag3Sn, (c) Ti0.99O0.01.

HW(2 questions) Determine the distance between nearest (110) planes in a simple cubic lattice with a lattice constant of an = 4.83 Å. (y 7s The lattice constant of a face-centered-cubicstructure is 4.75 Å. Calculate the surface density of atoms for (a)a (100) plane and (b) a (110) plane. (Ans. (a) 8.86 x 10+ cm-, (b) 6.27 x 10" cm-2]

Pure gold crystallizes in a face-centered cubic unit cell with an edge length of 4.08 Å. The alloy called 18-karat gold consists of 75% Au, 8.0% Ag, and 17% Cu by mass. What are the subscripts in the empirical formula of 18-karat gold (Au(x)Ag(y)Cu(z)) to two significant digits?