Practice Problem 3 with abbreviated answers

Q 3 please

Problem 4 The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 x 105 m²/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 × 10-¹4 m²/s?

In precipitation hardening, after being quenched into solution, overcooling is done and then either artificial aging is done at 180-250°C or natural aging is done at room temperature, both of which occur through diffusion, where temperature and time parameters are dominant. While 180°C and 250°C provide sufficient temperature for diffusion, is it not interesting that diffusion occurs at room temperature? This is because of the thermal energy of atoms causing them to move, which may facilitate diffusion at room temperature.

Rank the magnitudes of the diffusion coefficients from greatest to least for the following systems:   N in Fe at 700°C Cr in Fe at 700°C N in Fe at 900°C Cr in Fe at 900°C   Now justify this ranking. (Note: Both Fe and Cr have the BCC crystal structure, and the atomic radii for Fe, Cr, and N are 0.124, 0.125, and 0.065 nm, respectively. You may also want to refer to Section 5.4.)

Solve this problem and show all of the work

Draw a stress-strain curve for a low carbon steel and explain important points and regions in detail. What fracture behavior does this steel exhibit?

What are the differences between Equimolar counter diffusion (EMD) and Uni molecular diffusion

The Occupational Safety and Health Administration has set a Permissible Exposure Limit of 1000 parts per million (ppm) of acetone. You are an industrial hygienist doing personal sampling on a worker who is supervising a production process that uses acetone. The upcoming exposures can be measured: 700 ppm for three hours and 1300 ppm for two hours. 3 hours at 900 ppm What is the TWA as calculated? What advice would you provide plant management regarding acetone exposure and PEL adherence?

please computerized for clear answers